Signal processing system and related device

Abstract

The invention discloses a signal processing system and a related device, and relates to the technical field of millimeter wave radars. The signal processing system comprises a signal generating unit, a frequency mixing and phase shifting unit and N transmitting ports, wherein the signal generation unit is used for generating a base band signal, the base band signal comprises a first base band signal and a second base band signal, and the first base band signal and the second base band signal are orthogonal signals; the frequency mixing and phase shifting unit is used for performing frequency mixing processing and phase shifting processing on the baseband signal to obtain N radio frequency signals, and the phases or frequencies of the N radio frequency signals are different from one another; the N transmitting ports are used for transmitting the N radio frequency signals respectively; wherein N is a positive integer. The signal processing system can solve the problems of poor linearity and long stabilization time.

Description

Signal processing systems and related devices Technical Field

[0001] The present application relates to the field of millimeter wave radar technology, and in particular to a signal processing system and related devices. Background Art

[0002] Millimeter-wave radar is a radar that operates in the millimeter-wave band. It measures a target's distance, speed, and direction (angle) by emitting electromagnetic wave signals and detecting their reflections from the environment.

[0003] At present, millimeter-wave radars are mainly analog modulated radar (AMR). The transmitter of this type of radar uses a voltage-controlled oscillator and a phase-locked loop to achieve linear changes in the frequency of the transmitted signal. It can generate and transmit frequency-modulated continues-waves (FMCW), frequency shift keying (FSK) and single-tone continuous wave waveforms (CW).

[0004] However, current analog modulation radars have problems with poor linearity and long stabilization time.

[0005] Summary of the Invention

[0006] The embodiments of the present application provide a signal processing system and related devices that can solve the problems of poor linearity and long stabilization time.

[0007] In a first aspect, an embodiment of the present application provides a signal processing system, the signal processing system comprising:

[0008] Signal generation unit, frequency mixing and phase shifting unit, N transmitting ports; among which:

[0009] The signal generating unit is configured to generate a baseband signal, wherein the baseband signal includes a first baseband signal and a second baseband signal, and the first baseband signal and the second baseband signal are orthogonal signals;

[0010] The mixing and phase shifting unit is configured to perform mixing and phase shifting on the baseband signal to obtain N radio frequency signals, wherein the phases or frequencies of the N radio frequency signals are different from each other;

[0011] The N transmitting ports are used to transmit the N radio frequency signals respectively; wherein N is a positive integer.

[0012] In an embodiment of the present application, a signal processing system is provided, in which a signal generating unit is used to generate a baseband signal, and the baseband signal includes a first baseband signal and a second baseband signal that are orthogonal to each other. The frequency mixing and phase shifting unit in the signal processing system is used to process the baseband signal, that is, to perform frequency mixing and phase shifting on the first baseband signal and the second baseband signal to obtain N radio frequency signals, and transmit them through N transmitting ports in the signal processing system. The phases or frequencies of the N radio frequency signals are different from each other. Through the above-mentioned signal processing, the N radio frequency signals generated can be arbitrary waveforms, and there is no feedback adjustment of analog devices in the generation process, which can achieve better linearity and shorter stabilization time, thereby solving the problems of poor linearity and long stabilization time in current analog modulation radars.

[0013] In a possible implementation manner, the N radio frequency signals are frequency modulated continuous wave signals FMCW, and the N radio frequency signals satisfy a first pulse repetition interval PRI; or,

[0014] The N radio frequency signals are phase modulated continuous wave signals PMCW, and the N radio frequency signals meet a second pulse repetition interval PRI.

[0015] In an embodiment of the present application, possible forms of N radio frequency signals are provided. Specifically, the N radio frequency signals generated by the mixing and phase shifting unit in the signal processing system can be frequency-modulated continuous wave signals (FMCW) or phase-modulated continuous wave signals (PMCW). The N radio frequency signals satisfy any pulse repetition interval (PRI) and can realize radio frequency signals of arbitrary waveforms, thereby solving the problem that the current analog modulation radar has poor linearity and cannot generate radio frequency signals with a small PRI.

[0016] In a possible implementation manner, the first baseband signal is an in-phase signal, and the second baseband signal is a quadrature signal.

[0017] In an embodiment of the present application, a possible specific implementation of a first baseband signal and a second baseband signal is provided. Specifically, the first baseband signal is an in-phase signal, and the second baseband signal is a quadrature signal.

[0018] In a possible implementation, the frequency mixing and phase shifting unit includes:

[0019] a first frequency mixing unit, a first phase shifting unit;

[0020] The first frequency mixing unit is configured to perform frequency mixing on the baseband signal to obtain a first mixed signal;

[0021] The first phase shift unit is configured to perform phase shift processing on the first mixed signal to obtain the N radio frequency signals.

[0022] In an embodiment of the present application, a possible specific implementation of a frequency mixing and phase shifting unit is provided, specifically, the first frequency mixing unit in the frequency mixing and phase shifting unit is used to perform frequency mixing processing on a baseband signal generated by a signal generating unit, specifically, frequency mixing processing can be performed on the first baseband signal and the first local oscillator signal to obtain a first frequency mixing signal. The first phase shifting unit in the frequency mixing and phase shifting unit is used to perform phase shifting processing on the first frequency mixing signal to obtain N radio frequency signals. The phases or frequencies of the N radio frequency signals are different from each other. By the above-mentioned method of first performing frequency mixing processing and then performing phase shifting processing, the N radio frequency signals generated can be arbitrary waveforms, and there is no feedback adjustment of analog devices during the generation process, which can achieve better linearity and shorter stabilization time.

[0023] In a possible implementation, the first frequency mixing unit includes a first frequency mixing module, and the first frequency mixing module includes:

[0024] a first mixer, a second mixer;

[0025] The first mixer is configured to perform mixing processing on the first baseband signal and the first local oscillator signal;

[0026] The second mixer is configured to perform mixing processing on the second baseband signal and the first local oscillator signal.

[0027] In an embodiment of the present application, a possible specific implementation of a first frequency mixing unit is provided, specifically, the first frequency mixing module in the first frequency mixing unit includes a first mixer for performing frequency mixing processing on the first baseband signal and the first local oscillator signal, and the first frequency mixing module in the first frequency mixing unit includes a second frequency mixer for performing frequency mixing processing on the second baseband signal and the first local oscillator signal. The first frequency mixer and the second frequency mixer can be two independent mixers or two mixing devices in an IQ mixer. Through the first frequency mixer and the second frequency mixer included in the above-mentioned first frequency mixing module, it is possible to implement frequency mixing processing on one baseband signal (including the first baseband signal and the second baseband signal) and output the first mixed signal.

[0028] In a possible implementation, the first phase shifting unit includes:

[0029] N phase shifters;

[0030] The N phase shifters are used to perform phase shift processing on the N sub-mixing signals corresponding to the first mixing signal to obtain the N radio frequency signals.

[0031] In an embodiment of the present application, a possible specific implementation of a first phase shifting unit is provided, specifically, the N phase shifters in the first phase shifting unit are used to perform phase shifting processing on the N sub-mixing signals corresponding to the first mixing signal obtained by the first mixing unit, respectively, to obtain N radio frequency signals. The first mixing signal can be the corresponding N sub-mixing signals obtained after power division, and the N sub-mixing signals are the same, and the phases or frequencies of the corresponding N radio frequency signals obtained after phase shifting processing are different from each other. The N phase shifters included in the above-mentioned first phase shifting unit can realize radio frequency signals of arbitrary waveforms, and there is no feedback adjustment of analog devices during the generation process, which can achieve better linearity and shorter stabilization time, thereby solving the problems of poor linearity and long stabilization time in current analog modulation radars.

[0032] In a possible implementation, the frequency mixing and phase shifting unit includes:

[0033] a second phase shifting unit, a second frequency mixing unit;

[0034] The second phase shift unit is configured to perform phase shift processing on the first local oscillator signal to obtain N phase-shifted signals;

[0035] The second mixing unit is configured to perform mixing processing on the N sub-baseband signals corresponding to the one baseband signal and the N phase-shifted signals respectively to obtain the N radio frequency signals.

[0036] In an embodiment of the present application, a possible specific implementation of a frequency mixing and phase shifting unit is provided, specifically, the second phase shifting unit in the frequency mixing and phase shifting unit is used to perform phase shifting processing on the first local oscillator signal to obtain N phase-shifted signals, wherein the phases of the N phase-shifted signals are different from each other. The second frequency mixing unit in the frequency mixing and phase shifting unit is used to perform frequency mixing processing on the N sub-baseband signals corresponding to the one baseband signal generated by the signal generating unit and the N phase-shifted signals, respectively. Specifically, frequency mixing processing can be performed on a certain baseband signal among the N sub-baseband signals and a certain phase-shifted signal among the N phase-shifted signals to obtain N radio frequency signals, wherein the phases or frequencies of the N radio frequency signals are different from each other. By the above-mentioned method of first performing phase shifting processing and then frequency mixing processing, the N radio frequency signals generated can be arbitrary waveforms, and there is no feedback adjustment of analog devices during the generation process, which can achieve better linearity and shorter stabilization time.

[0037] In a possible implementation, the second phase shifting unit includes:

[0038] N phase shifters;

[0039] The N phase shifters are used to perform phase shift processing on the N sub-local oscillator signals corresponding to the first local oscillator signal to obtain the N phase-shifted signals.

[0040] In an embodiment of the present application, a possible specific implementation of a second phase shifting unit is provided. Specifically, N phase shifters in the second phase shifting unit are used to perform phase shifting processing on N local oscillator signals corresponding to a first local oscillator signal, thereby obtaining N phase-shifted signals. The first local oscillator signal may be N corresponding local oscillator signals obtained after power division, and the N local oscillator signals are identical. The N phase shifters included in the second phase shifting unit can achieve an effect in which the phases of the N corresponding phase-shifted signals obtained after the phase shifting processing are different from each other.

[0041] In a possible implementation, the second frequency mixing unit includes N frequency mixing modules, and the second frequency mixing module among the N frequency mixing modules includes:

[0042] a third mixer, a fourth mixer;

[0043] The third mixer is configured to perform mixing processing on a first sub-baseband signal corresponding to the first baseband signal and a first phase-shifted signal among the N phase-shifted signals;

[0044] The fourth mixer is configured to perform mixing processing on a second sub-baseband signal corresponding to the second baseband signal and the first phase-shifted signal.

[0045] In an embodiment of the present application, a possible specific implementation of a second frequency mixing unit is provided. Specifically, the third mixer included in the second frequency mixing module in the second frequency mixing unit is used to perform frequency mixing processing on the first sub-baseband signal corresponding to the first baseband signal and the first phase-shifted signal among the N phase-shifted signals obtained by the second phase-shifting unit. The fourth mixer included in the second frequency mixing module in the second frequency mixing unit is used to perform frequency mixing processing on the second sub-baseband signal corresponding to the second baseband signal and the first phase-shifted signal among the N phase-shifted signals obtained by the second phase-shifting unit. The third mixer and the fourth mixer can be two independent mixers or two mixing devices in an IQ mixer. The first sub-baseband signal corresponding to the first baseband signal can be a first sub-baseband signal among the N first sub-baseband signals obtained after power division of the first baseband signal, and the N first sub-baseband signals are the same. The second sub-baseband signal corresponding to the second baseband signal can be a second sub-baseband signal among the N second sub-baseband signals obtained after power division of the second baseband signal, and the N second sub-baseband signals are the same. Through the third mixer and the fourth mixer included in the above-mentioned second mixing module, a radio frequency signal of arbitrary waveform can be output. The N mixing modules in the second mixing unit include the above-mentioned second mixing module, which can achieve that the phases or frequencies of the output N radio frequency signals of arbitrary waveforms are different from each other, and there is no feedback adjustment of analog devices in the generation process, which can achieve better linearity and shorter stabilization time, thereby solving the problems of poor linearity and long stabilization time in current analog modulation radars.

[0046] In a possible implementation, the frequency mixing and phase shifting unit includes:

[0047] a third phase shifting unit, a third frequency mixing unit;

[0048] The third phase shifting unit is configured to perform phase shift processing on the first baseband signal to obtain N first phase-shifted signals, and perform phase shift processing on the second baseband signal to obtain N second phase-shifted signals;

[0049] The third frequency mixing unit is configured to perform frequency mixing processing on the N first phase-shifted signals and the N second phase-shifted signals respectively to obtain the N radio frequency signals.

[0050] In an embodiment of the present application, a possible specific implementation of a frequency mixing and phase shifting unit is provided. Specifically, a third phase shifting unit in the frequency mixing and phase shifting unit is configured to perform phase shifting processing on the first baseband signal to obtain N first phase-shifted signals, and to perform phase shifting processing on the second baseband signal to obtain N second phase-shifted signals, wherein the phases of the N first phase-shifted signals are different from each other, and the phases of the N second phase-shifted signals are different from each other. The third frequency mixing unit in the frequency mixing and phase shifting unit is configured to perform mixing processing on the N first phase-shifted signals and the N second phase-shifted signals obtained by the third phase shifting unit, respectively. Specifically, mixing processing can be performed on a first phase-shifted signal among the N first phase-shifted signals and a second phase-shifted signal among the N second phase-shifted signals, respectively, to obtain N radio frequency signals, wherein the phases or frequencies of the N radio frequency signals are different from each other. By performing the above-mentioned phase shifting processing followed by the frequency mixing processing, the generated N radio frequency signals can be arbitrary waveforms, and no analog device feedback adjustment is required during the generation process, thereby achieving good linearity and a short settling time.

[0051] In a possible implementation, the third phase shifting unit includes:

[0052] 2N phase shifters;

[0053] The 2i-1th phase shifter among the 2N phase shifters is configured to perform phase shift processing on the N sub-baseband signals corresponding to the first baseband signal to obtain the N first phase-shifted signals;

[0054] The 2i-th phase shifter among the 2N phase shifters is configured to perform phase shift processing on the N sub-baseband signals corresponding to the second baseband signal to obtain the N second phase-shifted signals;

[0055] Wherein, the i is a positive integer less than or equal to the N.

[0056] In an embodiment of the present application, a possible specific implementation of a third phase shifting unit is provided, specifically, the 2i-1th phase shifter among the 2N phase shifters in the third phase shifting unit is used to perform phase shift processing on the N baseband signals corresponding to the first baseband signal, respectively, to obtain N first phase-shifted signals, and the 2ith phase shifter among the 2N phase shifters is used to perform phase shift processing on the N baseband signals corresponding to the second baseband signal, respectively, to obtain N second phase-shifted signals. The first baseband signal can be the corresponding N baseband signals obtained after power division, and the N baseband signals are the same, and the phases of the N first phase-shifted signals obtained after the phase shifting processing are different from each other. The second baseband signal can be the corresponding N baseband signals obtained after power division, and the N baseband signals are the same, and the phases of the N second phase-shifted signals obtained after the phase shifting processing are different from each other. The 2N phase shifters included in the third phase shift unit can achieve an effect in which the phases of the N first phase-shifted signals obtained after phase shifting are different from each other, and an effect in which the phases of the N second phase-shifted signals are different from each other.

[0057] In a possible implementation, the third frequency mixing unit includes N frequency mixing modules, and the third frequency mixing module among the N frequency mixing modules includes:

[0058] a fifth mixer, a sixth mixer;

[0059] The fifth mixer is configured to perform mixing processing on the first local oscillator signal and one of the N first phase-shifted signals;

[0060] The sixth mixer is configured to perform mixing processing on the first local oscillator signal and one of the N second phase-shifted signals.

[0061] In an embodiment of the present application, a possible specific implementation of a third frequency mixing unit is provided. Specifically, a fifth mixer included in a third frequency mixing module in the third frequency mixing unit is used to perform frequency mixing processing on a first local oscillator signal and one of N first phase-shifted signals obtained by a third phase-shifting unit, and a sixth mixer included in a third frequency mixing module in the third frequency mixing unit is used to perform frequency mixing processing on the first local oscillator signal and one of N second phase-shifted signals obtained by the third phase-shifting unit. The fifth mixer and the sixth mixer can be two independent mixers or two mixing devices in a single IQ mixer. Through the fifth mixer and the sixth mixer included in the above-mentioned third mixing module, a radio frequency signal of arbitrary waveform can be output. The N mixing modules in the third mixing unit include the above-mentioned third mixing module, which can achieve that the phases or frequencies of the output N radio frequency signals of arbitrary waveforms are different from each other, and there is no feedback adjustment of analog devices in the generation process, which can achieve better linearity and shorter stabilization time, thereby solving the problems of poor linearity and long stabilization time in current analog modulation radars.

[0062] In a possible implementation, the frequency mixing and phase shifting unit includes:

[0063] a fourth mixing unit, a fifth mixing unit;

[0064] The fourth frequency mixing unit is configured to perform frequency mixing processing on each of the N second local oscillator signals, the orthogonal signal corresponding to each of the second local oscillator signals, and the N baseband signals corresponding to the first baseband signal, respectively, to obtain N first mixed signals; and to perform frequency mixing processing on each of the N second local oscillator signals, the orthogonal signal corresponding to each of the second local oscillator signals, and the N baseband signals corresponding to the second baseband signal, respectively, to obtain N second mixed signals;

[0065] The fifth frequency mixing unit is configured to perform frequency mixing processing on the N first frequency mixing signals and the N second frequency mixing signals respectively to obtain the N radio frequency signals.

[0066] In an embodiment of the present application, a possible specific implementation of a frequency mixing and phase shifting unit is provided, specifically, a fourth frequency mixing unit in the frequency mixing and phase shifting unit is configured to perform frequency mixing processing on each of the N second local oscillator signals, the orthogonal signal corresponding to each second local oscillator signal, and the N baseband signals corresponding to the first baseband signal, respectively, to obtain N first frequency mixing signals; and to perform frequency mixing processing on each of the N second local oscillator signals, the orthogonal signal corresponding to each second local oscillator signal, and the N baseband signals corresponding to the second baseband signal, respectively, to obtain N second frequency mixing signals. The phases of the N first frequency mixing signals are different from each other, and the phases of the N second frequency mixing signals are different from each other. The fifth mixing unit in the mixing and phase shifting unit is configured to perform mixing processing on the N first mixing signals and the N second mixing signals obtained by the fourth mixing unit. Specifically, mixing processing may be performed on a first mixing signal among the N first mixing signals and a second mixing signal among the N second mixing signals, to obtain N radio frequency signals, wherein the phases or frequencies of the N radio frequency signals are different from each other. By performing the phase shifting followed by mixing processing, the N generated radio frequency signals can be arbitrary waveforms, and the generation process does not require feedback adjustment of analog devices, thereby achieving good linearity and a short settling time.

[0067] In a possible implementation manner, frequencies of the N second local oscillation signals are different from each other.

[0068] In an embodiment of the present application, a possible specific implementation of N second local oscillator signals is provided. Specifically, the frequencies of the N second local oscillator signals are different from each other, and the frequencies of the N second local oscillator signals are also different from the frequency of the first local oscillator signal. The N first mixing signals and N second mixing signals obtained from the N second local oscillator signals with different frequencies can achieve different phases between the N first mixing signals and the N second mixing signals.

[0069] In a possible implementation, the fourth frequency mixing unit includes 2N frequency mixing modules, and the fourth frequency mixing module among the 2N frequency mixing modules includes:

[0070] a seventh mixer, an eighth mixer;

[0071] The seventh mixer is configured to perform mixing processing on one second local oscillator signal among the N second local oscillator signals and a first sub-baseband signal corresponding to the first baseband signal;

[0072] The eighth mixer is configured to perform mixing processing on the quadrature signal corresponding to the second local oscillator signal and the first sub-baseband signal corresponding to the first baseband signal;

[0073] The fifth mixing module among the 2N mixing modules includes:

[0074] ninth mixer, tenth mixer;

[0075] The ninth mixer is configured to perform mixing processing on one second local oscillator signal among the N second local oscillator signals and a second sub-baseband signal corresponding to the second baseband signal;

[0076] The tenth mixer is configured to perform mixing processing on the orthogonal signal corresponding to the second local oscillator signal and the second sub-baseband signal corresponding to the second baseband signal.

[0077] In an embodiment of the present application, a possible specific implementation of a fourth mixing unit is provided. Specifically, a seventh mixer included in a fourth mixing module in the fourth mixing unit is configured to mix one second local oscillator signal among N second local oscillator signals with a first sub-baseband signal corresponding to the first baseband signal. An eighth mixer included in the fourth mixing module in the fourth mixing unit is configured to mix an orthogonal signal corresponding to the second local oscillator signal with a first sub-baseband signal corresponding to the first baseband signal. The seventh and eighth mixers may be two independent mixers or two mixing devices within a single IQ mixer. The first sub-baseband signal may be one first sub-baseband signal among N first sub-baseband signals obtained by power division of the first baseband signal. The seventh and eighth mixers included in the fourth mixing module can output one first mixed signal. The 2N mixing modules in the fourth mixing unit, including the fourth mixing module, can output N first mixed signals, with the N first mixed signals having different phases.

[0078] Similarly, the ninth mixer included in the fifth mixing module in the fourth mixing unit is used to perform mixing processing on one second local oscillator signal among the N second local oscillator signals and the second sub-baseband signal corresponding to the second baseband signal. The tenth mixer included in the fifth mixing module in the fourth mixing unit is used to perform mixing processing on the orthogonal signal corresponding to the second local oscillator signal and the second sub-baseband signal corresponding to the second baseband signal. The ninth mixer and the tenth mixer can be two independent mixers or two mixing devices in a single IQ mixer. The second sub-baseband signal can be one second sub-baseband signal among the N second sub-baseband signals obtained after power division of the second baseband signal. The ninth mixer and the tenth mixer included in the fifth mixing module can output one second mixed signal. The 2N mixing modules in the fourth mixing unit, including the fifth mixing module, can output N second mixed signals, and the phases of the N second mixed signals are different from each other.

[0079] In a possible implementation, the fifth frequency mixing unit includes N frequency mixing modules, and a sixth frequency mixing module among the N frequency mixing modules includes:

[0080] an eleventh mixer, a twelfth mixer;

[0081] The eleventh mixer is configured to perform mixing processing on the first local oscillator signal and one of the N first mixed signals;

[0082] The twelfth mixer is configured to perform mixing processing on the first local oscillator signal and one second mixed signal among the N second mixed signals.

[0083] In an embodiment of the present application, a possible specific implementation of a fifth frequency mixing unit is provided, specifically, the eleventh mixer included in the sixth frequency mixing module in the fifth frequency mixing unit is used to perform mixing processing on the first local oscillator signal and one first frequency mixing signal among the N first frequency mixing signals obtained by the fourth frequency mixing unit, and the twelfth mixer included in the sixth frequency mixing module in the fifth frequency mixing unit is used to perform mixing processing on the first local oscillator signal and one second frequency mixing signal among the N second frequency mixing signals obtained by the fourth frequency mixing unit. The eleventh mixer and the twelfth mixer can be two independent mixers or two mixing devices in a single IQ mixer. Through the eleventh mixer and the twelfth mixer included in the above-mentioned sixth mixing module, a radio frequency signal of arbitrary waveform can be output. The N mixing modules in the fifth mixing unit include the above-mentioned sixth mixing module, which can achieve that the phases or frequencies of the output N radio frequency signals of arbitrary waveforms are different from each other, and there is no feedback adjustment of analog devices in the generation process, which can achieve better linearity and shorter stabilization time, thereby solving the problems of poor linearity and long stabilization time in current analog modulation radars.

[0084] In a possible implementation, the signal generating unit includes:

[0085] a first digital-to-analog converter, a second digital-to-analog converter;

[0086] The first digital-to-analog converter is configured to perform digital-to-analog conversion on the input first digital signal to obtain the first baseband signal;

[0087] The second digital-to-analog converter is configured to perform digital-to-analog conversion on the input second digital signal to obtain the second baseband signal.

[0088] In an embodiment of the present application, a possible specific implementation of a signal generation unit is provided. Specifically, a first digital-to-analog converter in the signal generation unit is configured to perform digital-to-analog conversion on an input first digital signal, and a second digital-to-analog converter in the signal generation unit is configured to perform digital-to-analog conversion on an input second digital signal. The first and second digital-to-analog converters in the signal generation unit can generate mutually orthogonal first and second baseband signals.

[0089] In a possible implementation, the signal generating unit includes:

[0090] a first phase shifter, a second phase shifter;

[0091] The first phase shifter is configured to perform phase shift processing on the input first digital signal and the third local oscillator signal to obtain the first baseband signal;

[0092] The second phase shifter is used to perform phase shift processing on the input second digital signal and the third local oscillator signal to obtain the second baseband signal.

[0093] In an embodiment of the present application, a possible specific implementation of a signal generation unit is provided. Specifically, a first phase shifter in the signal generation unit is used to perform phase shifting processing on an input first digital signal and a third local oscillator signal, and a second phase shifter in the signal generation unit is used to perform phase shifting processing on an input second digital signal and a third local oscillator signal. The frequency of the third local oscillator signal is different from the frequency of the first local oscillator signal and the frequency of the second local oscillator signal. The first and second phase shifters in the signal generation unit can generate mutually orthogonal first and second baseband signals.

[0094] In a second aspect, an embodiment of the present application provides a chip, which includes the signal processing system described in the first aspect or any possible implementation of the first aspect.

[0095] In a third aspect, embodiments of the present application provide a radar or radar system, comprising the signal processing system described in the first aspect or any possible implementation of the first aspect, or comprising the chip described in the second aspect. It should be noted that there may be smart sensors that integrate multiple sensors. If the smart sensor includes millimeter-wave detection capabilities, the smart sensor may also be referred to as a millimeter-wave radar or millimeter-wave radar system.

[0096] In a fourth aspect, an embodiment of the present application provides a terminal device, which includes the signal processing system described in the first aspect or any possible implementation of the first aspect, or includes the chip described in the second aspect, or includes the radar or radar system described in the third aspect.

[0097] In the fifth aspect, an embodiment of the present application provides a vehicle side, which includes the signal processing system described in the first aspect or any possible implementation of the first aspect, or includes the chip described in the second aspect, or includes the radar or radar system described in the third aspect, or includes the terminal device described in the fourth aspect.

[0098] In an embodiment of the present application, a signal generation unit generates a baseband signal comprising two mutually orthogonal signals, and a mixing and phase shifting unit performs mixing and phase shifting on the baseband signal, thereby generating N radio frequency signals with different phases or frequencies. These N radio frequency signals can be arbitrary waveforms, and the generation process requires no feedback adjustment from analog devices, resulting in superior linearity and a shorter settling time. This addresses the issues of poor linearity and long settling time currently encountered in analog modulation radars. BRIEF DESCRIPTION OF THE DRAWINGS

[0099] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0100] FIG1 is a schematic diagram of a radar distribution according to an embodiment of the present application;

[0101] FIG2 is a schematic diagram of the architecture of a radar provided in an embodiment of the present application;

[0102] FIG3 is a schematic diagram of the architecture of a radar provided in an embodiment of the present application;

[0103] FIG4 is a schematic structural diagram of a signal processing system provided in an embodiment of the present application;

[0104] FIG5 is a schematic diagram of the structure of a signal processing system provided in an embodiment of the present application;

[0105] FIG6 is a schematic diagram of the structure of a signal processing system provided in an embodiment of the present application;

[0106] FIG7 is a schematic diagram of the structure of another signal processing system provided in an embodiment of the present application;

[0107] FIG8 is a schematic structural diagram of another signal processing system provided in an embodiment of the present application;

[0108] FIG9 is a schematic structural diagram of another signal processing system provided in an embodiment of the present application;

[0109] FIG10 is a schematic structural diagram of another signal processing system provided in an embodiment of the present application;

[0110] FIG11 is a schematic structural diagram of another signal processing system provided in an embodiment of the present application;

[0111] FIG12 is a schematic structural diagram of another signal processing system provided in an embodiment of the present application;

[0112] FIG13 is a schematic diagram of the structure of another signal processing system provided in an embodiment of the present application;

[0113] FIG14 is a schematic structural diagram of another signal processing system provided in an embodiment of the present application;

[0114] FIG15 is a schematic structural diagram of another signal processing system provided in an embodiment of the present application;

[0115] FIG16 is a schematic structural diagram of another signal processing system provided in an embodiment of the present application;

[0116] FIG17 is a schematic structural diagram of another signal processing system provided in an embodiment of the present application;

[0117] FIG18 is a schematic structural diagram of another signal processing system provided in an embodiment of the present application;

[0118] FIG19 is a signal diagram provided in an embodiment of the present application;

[0119] FIG20 is a signal diagram provided in an embodiment of the present application;

[0120] FIG21 is a schematic structural diagram of another signal processing system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0121] In order to make the purpose, technical solutions and advantages of this application clearer, the embodiments of this application will be described below in conjunction with the drawings in the embodiments of this application.

[0122] The terms "first" and "second" in the specification, claims, and drawings of this application are used to distinguish different objects, not to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units that are inherent to the process, method, product, or device.

[0123] References to "embodiments" herein mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it refer to independent or alternative embodiments that are mutually exclusive of other embodiments. It will be understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0124] It should be understood that in the present application, "at least one (item)" refers to one or more, "more than one" refers to two or more, "at least two (items)" refers to two or three and more than three, and "and / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following items" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0125] As mentioned in the background technology section, it is necessary to study how to solve the problems of poor linearity and long stabilization time in current analog modulation radars. This application provides a signal processing system and related devices related to the field of millimeter wave radar technology, which can effectively solve the problems of poor linearity and long stabilization time.

[0126] In order to more clearly describe the solution of this application, some knowledge related to radar is first introduced below.

[0127] Radar is the transliteration of the English word Radar, which comes from the abbreviation of "radio detection and ranging", meaning "radio detection and ranging". It uses radio methods to detect targets and determine the spatial position of targets.

[0128] Radar uses electromagnetic waves as its detection medium, and it uses the transmission and reception of electromagnetic waves to detect targets, for example, to measure distance, speed, or azimuth. Radar can measure distance to a target based on the time of flight of electromagnetic waves, which is the time difference between the transmission and reception of electromagnetic waves. Radar transmits an electromagnetic wave signal and receives an echo signal. The distance to the target is determined based on the time difference between the received echo signal and the transmitted electromagnetic wave signal and the propagation speed of the electromagnetic wave. The distance between the radar and the target can be determined using the following formula: s = c * t / 2, where s is the distance to the target, t is the time of flight (the time from the radar transmitting the electromagnetic wave signal to the receipt of the echo signal), and c is the speed of light.

[0129] Radar uses the Doppler effect to measure target velocity. The Doppler effect works as follows: when a vibration source, such as sound, light, or radio waves, moves relative to an observer at a relative speed, the frequency of the vibration received by the observer differs from the frequency emitted by the source. When the electromagnetic waves emitted by the radar and the target are in relative motion, the frequency of the echo signal will differ from the frequency of the transmitted electromagnetic wave. When the target approaches the radar antenna, the frequency of the echo signal will be higher than the frequency of the transmitted electromagnetic wave; conversely, when the target moves away from the radar antenna, the frequency of the echo signal will be lower than the frequency of the transmitted electromagnetic wave. The frequency change caused by the Doppler effect is called the Doppler shift, which is proportional to the relative velocity and inversely proportional to the vibration frequency. Therefore, by detecting the frequency difference between the transmitted electromagnetic wave signal and the echo signal, the target's speed relative to the radar—that is, the relative velocity between the target and the radar—can be measured.

[0130] Radar can use amplitude method, phase method and other methods to measure azimuth angle. The amplitude method uses the amplitude value of the echo signal received by the antenna to measure the angle. The change pattern of the amplitude value depends on the antenna radiation pattern and the antenna scanning method; the phase method uses the phase difference between the echo signals received by multiple antenna units to measure the angle. For example, the radar receives the echo signal reflected by the same target through the antenna array, and calculates the azimuth angle of the target based on the phase difference of the echo signal.

[0131] Millimeter-wave radar uses electromagnetic waves within a certain wavelength range, such as microwaves. Currently, millimeter waves and adjacent centimeter waves (e.g., centimeter waves in the 24 GHz band) are more commonly used. Millimeter waves have wavelengths of 1 to 10 millimeters (mm), with those in the 24 GHz band having wavelengths slightly larger than 10 mm. Because the wavelength of millimeter-wave radar's detection medium lies in the overlapping wavelength range of microwaves and far-infrared waves, it combines the characteristics of both spectrums. According to wave propagation theory, higher frequencies and shorter wavelengths yield higher resolution and greater penetration, but also greater propagation losses and shorter transmission distances. Conversely, lower frequencies and longer wavelengths yield greater diffraction resistance and longer transmission distances. Therefore, compared to microwaves, millimeter-wave radar's detection medium offers higher resolution, better directivity, stronger anti-interference capabilities, and superior detection performance. Compared to infrared, millimeter-wave radar experiences less atmospheric attenuation, has better penetration of smoke and dust, and is less affected by weather. Therefore, millimeter-wave radar has been increasingly widely used in many fields such as smart vehicles, drones, smart transportation, and industrial automation.

[0132] Radar can be categorized into long-range radar (LRR), mid-range radar (MRR), and short-range radar (SRR) based on their detection range. LRR has higher detection range requirements but relatively lower angular detection width requirements. SRR has relatively lower detection range requirements but higher angular detection width requirements. MRR's detection range and angular detection width requirements can be understood as falling between those of LRR and SRR. For example, LRR's detection range can reach over 200 meters and its angular detection width can be ±15°; MRR's detection range is within 100 meters and its angular detection width can be ±45°; and SRR's detection range is within 60 meters and its angular detection width can be ±80°. Different types of radar can be installed in different locations on the vehicle body based on the autonomous driving functional requirements and the use of other sensors. The number and type of radars can be selected as needed.

[0133] Please refer to FIG1 , which is a schematic diagram of a radar distribution provided in an embodiment of the present application.

[0134] FIG1 shows possible installation locations of several types of radars. This is only an example. In actual use, a greater or lesser number of radars may be selected, and the types may also be adjusted.

[0135] As shown in Figure 1, the LRR can be installed in front of the vehicle as a forward-facing radar; the MRR can be installed in front of or behind the vehicle as a forward-facing radar or a rear-facing radar; and the SRR can be installed on the side or at the four corners of the vehicle as a side-facing radar or a corner radar. Furthermore, the MRR can also be installed on the side or at the four corners of the vehicle, and the SRR can also be installed in the front or rear of the vehicle.

[0136] Radars can be classified based on the modulation method (or radiation method) of their electromagnetic waves. Radar electromagnetic wave modulation methods include pulse and continuous wave, so radars can be divided into pulse radars and continuous wave radars. Continuous wave methods can be further divided into frequency shift keying (FSK), phase shift keying (PSK), constant frequency / single frequency continuous wave (CW), frequency modulated continuous wave (FMCW), multiple frequency shift keying (MFSK), and phase modulated continuous wave (PMCW). FMCW has become the mainstream radar modulation method due to its ability to detect multiple targets, high resolution, and low cost.

[0137] Please refer to FIG2 , which is a schematic diagram of the architecture of a radar provided in an embodiment of the present application.

[0138] As shown in Figure 2, the radar includes a control circuit 110, a signal generator 120, a power amplifier (PA) 130, a low-noise amplifier (LNA) 140, a mixer 150, a filter 160, an analog-to-digital converter (ADC) 170, and a signal processor 180. The signal processor is typically used to process digital signals, such as a digital signal processor (DSP). Under the control of the control circuit 110, the signal generator 120 generates an electromagnetic wave signal (also known as a radar signal) waveform. For example, in a radar using FMCW modulation, the signal generator 120 generates a sawtooth or triangular wave under the control of the control circuit 110. The signal generator 120 is, for example, a voltage-controlled oscillator, and the control circuit 110 is used to generate a control voltage. The generated electromagnetic wave signal waveform undergoes frequency conversion modulation to the desired frequency band, such as between 76 GHz and 77 GHz. After being amplified by the PA 130, it is radiated into space through the transmit antenna (TX).

[0139] The electromagnetic wave signal radiated by the transmitting antenna hits the target, reflects into space, and is received by the radar's receiving antenna (RX). After being amplified by LNA 140, it is mixed with a reference signal by mixer 150. The reference signal can typically be the electromagnetic wave signal generated above. After filtering by filter 160, mixer 150 generates an analog baseband signal, which is sampled by ADC 170 to obtain a digital baseband signal. The digital baseband signal is processed in signal processor 180 to obtain target range, speed, and angle information. In addition, this information can be used for clustering and / or tracking to further determine the target's trajectory, size, type, and other information.

[0140] To reduce costs, automotive radar uses analog mixing and filtering. However, as technology advances, digital mixing and filtering technologies may be adopted. In the mixing stage, I / Q quadrature mixing can be used to generate complex baseband signals (I and Q signals), including the mixer, filter, and ADC outlined in the dashed box. Alternatively, single-channel I mixing can be used to generate a single baseband signal, excluding the mixer, filter, and ADC outlined in the dashed box.

[0141] The various components of the radar described above can be integrated as needed to achieve miniaturization of the radar. For example, components such as the control circuit 110, signal generator 120, power amplifier (PA) 130, low noise amplifier (LNA) 140, mixer 150, filter 160, and analog-to-digital converter (ADC) 170 can be integrated on at least one chip, such as a monolithic microwave integrated circuit (MMIC).

[0142] For details, please refer to Figure 3, which is a schematic diagram of the architecture of a radar provided in an embodiment of the present application.

[0143] As shown in Figure 3, the radar includes an MMIC, a microcontroller unit (MCU), and a power management integrated circuit (PMIC). The MMIC can integrate the functions of the RF part, and the MCU can integrate the functions of the above baseband part, such as the functions of the above signal processor. In addition, it can also provide a communication interface with other on-board devices. The PMIC is the chip that powers the radar hardware system.

[0144] In addition, multiple input multiple output (MIMO) technology can provide radar with better angular resolution performance and is widely used in the field of autonomous driving.

[0145] For example, radars using MIMO technology can be used in autonomous vehicles. The multiple antennas contained in these radars can be arranged at various locations on the vehicle body to achieve awareness of the vehicle's surroundings. In this case, when transmitting signals using Doppler-frequency division multiplexing (DDM), the MIMO radar may simultaneously scan multiple targets. The radar can derive the Doppler spectrum from the transmitted signal and the received echo signal, and then use the Doppler spectrum to determine the detected target and perform target measurements, such as distance and speed.

[0146] After processing at the receiver, the range velocity (RV) spectrum of a signal transmitted using DDM has multiple peaks at the same range bin but different velocity bins. The number of peaks is related to the number of transmitting antennas. As the number of radar transmitting antennas increases, more peaks appear in the Doppler spectrum.

[0147] Therefore, the bandwidth of the Doppler spectrum needs to be increased to ensure a reasonable frequency difference between the DDM spectrum peaks.

[0148] Optionally, a signal processing system using MIMO technology may refer to FIG4 , which is a schematic structural diagram of a signal processing system provided in an embodiment of the present application.

[0149] As shown in Figure 4, the transmitter uses a voltage-controlled oscillator (VCO) and a phase-locked loop (PLL) to achieve linear frequency variation of the transmitted signal. Under voltage control, the VCO can output a signal whose frequency varies linearly with time. Because the frequency of the VCO's output signal is unstable, negative feedback within the PLL can generate a frequency-stable, high-precision FMCW signal. When the signal processing system has multiple transmit antennas (such as Tx1, Tx2, and Tx3), to implement MIMO technology, the signals transmitted by these antennas must be orthogonal. Therefore, multiple phase shifters are added after the VCO+PLL module. Each transmit channel generates a different transmit signal through time-varying phase shifting, which is ultimately radiated through the transmit antenna. A typical waveform for phase shifting to achieve MIMO transmission is the aforementioned DDM method. This method achieves frequency deviation between different transmit signals by varying the phase change per unit time of each transmit channel, thereby distinguishing the signals on the Doppler spectrum.

[0150] However, due to the introduction of negative feedback control, the frequency needs to oscillate for a period of time after a sudden change to achieve good linearity. This means that each time a signal is output, it takes some time to obtain an effective linear segment. This increases the time it takes to obtain a valid pulse signal within a transmission cycle, making it impossible to generate FMCW signals with a small pulse repetition interval (PRI).

[0151] Optionally, a signal processing system using MIMO technology may also refer to FIG5 , which is a schematic structural diagram of a signal processing system provided in an embodiment of the present application.

[0152] As shown in Figure 5, the signal processing system includes multiple digital-to-analog converters (DACs). The greatest advantage of the DAC architecture is its ability to generate arbitrary waveforms, such as FMCW, PMCW, and orthogonal frequency division multiplexing (OFDM). This architecture stores the time-domain amplitude of the transmit waveform in a memory cell, generates an analog low-frequency baseband signal through the DAC, and then mixes it with the local oscillator (LO) through an IQ mixer to generate an RF signal, which is then radiated from the antenna through a power amplifier (PA). In addition to being able to generate arbitrary waveforms, this architecture eliminates the need for analog device feedback adjustment when generating FMCW waveforms. Therefore, there are no time constraints for nonlinear segments, allowing for a shorter PRI, making it more suitable for multi-transmit channel radar systems.

[0153] However, when the signal processing system has multiple transmission channels (such as transmitting antennas Tx1, Tx2, Tx3, etc.), in order to enable multiple transmission channels to transmit different signals, each channel has an independent DAC group, which will inevitably lead to increased hardware complexity, increased power consumption and increased costs.

[0154] In response to the technical problems of poor linearity, long stabilization time, and high cost in the signal processing systems shown in Figures 4 and 5 above, the present application provides a new signal processing system and related devices, involving the field of millimeter wave radar technology, which can effectively solve the problems of poor linearity and long stabilization time in the above signal processing systems and save costs.

[0155] The signal processing system provided by this application will be described below with reference to the accompanying drawings.

[0156] Please refer to FIG6 , which is a schematic structural diagram of a signal processing system provided in an embodiment of the present application.

[0157] As shown in Fig. 6, the signal processing system includes a signal generating unit 10, a frequency mixing and phase shifting unit 20, and N transmitting ports (eg, Tx1, Tx2, ..., TxN), where N is a positive integer.

[0158] The functions of the signal generation unit 10, the frequency mixing and phase shifting unit 20, and the N transmitting ports (Tx1, Tx2, ..., TxN) are as follows:

[0159] The signal generating unit 10 is configured to generate a baseband signal, where the baseband signal includes a first baseband signal and a second baseband signal that are orthogonal to each other.

[0160] The mixing and phase-shifting unit 20 is configured to process the baseband signal, i.e., perform mixing and phase-shifting on the first baseband signal and the second baseband signal to obtain N RF signals (RF signal 1, RF signal 2, ..., RF signal N). It is understood that the mixing and phase-shifting unit 20 may perform one or more mixing and phase-shifting operations on the first baseband signal and the second baseband signal, and may perform mixing first and then phase-shifting, or may perform phase-shifting first and then mixing, etc., and this application does not impose any limitation on this.

[0161] N transmitting ports (Tx1, Tx2, ..., TxN) are used to transmit N RF signals (RF signal 1, RF signal 2, ..., RF signal N) obtained by the frequency mixing and phase shifting unit 20, so that the N RF signals can be transmitted from the N transmitting ports respectively. For example, the transmitting port Tx1 is used to transmit RF signal 1, the transmitting port Tx2 is used to transmit RF signal 2, the transmitting port TxN is used to transmit RF signal N, and so on. This application does not impose any restrictions on this. Among them, the phases or frequencies of the N RF signals are different from each other, that is, the phases or frequencies between the above-mentioned RF signal 1, RF signal 2, ..., RF signal N are different from each other. Furthermore, the phases or frequencies of the above-mentioned N RF signals can be linearly changed and have good linearity. The N transmitting ports can be N transmitting antennas.

[0162] Through the above signal processing, the N generated RF signals can be arbitrary waveforms, such as FMCW, PMCW, OFDM, and other waveforms. Furthermore, compared to the signal processing system shown in Figure 4 , this signal processing system generates N RF signals without feedback adjustments like those from analog devices such as phase-locked loops (PLLs), achieving superior linearity and shorter settling times. This addresses the issues of poor linearity and long settling times currently encountered in analog modulation radars. Furthermore, compared to the signal processing system shown in Figure 5 , this signal processing system eliminates the need for independent DAC groups for each channel to transmit different signals across multiple transmit channels, reducing hardware complexity, power consumption, and costs.

[0163] In some possible embodiments, the N RF signals (RF signal 1, RF signal 2, ..., RF signal N) generated by the mixing and phase shifting unit 20 in the signal processing system may be FMCW or PMCW. These N RF signals satisfy any PRI, enabling the generation of RF signals of arbitrary waveforms. This can address the problem of poor linearity in current analog modulation radars, which prevents the generation of RF signals with a small PRI.

[0164] In some possible embodiments, the first baseband signal is an in-phase signal, and the second baseband signal is a quadrature signal. The phase of the in-phase signal differs by 90 degrees from the phase of the quadrature signal. The two signals are combined by an adder to form an output signal, which is a quadrature modulated signal. It is understood that the first baseband signal and the second baseband signal generated by the signal generation unit 10 are orthogonal signals.

[0165] Please refer to Figure 7, which is a schematic diagram of the structure of a signal processing system provided in an embodiment of the present application. It is understood that the signal processing system shown in Figure 7 can be implemented as a separate embodiment, or the signal processing system shown in Figure 7 can also be understood as a variation or supplement to the signal processing system in Figure 6 above.

[0166] As shown in Fig. 7, the signal processing system includes a signal generating unit 10, a frequency mixing and phase shifting unit 20, and N transmitting ports (eg, Tx1, Tx2, ..., TxN), where N is a positive integer.

[0167] Specifically, the connection relationship and functional description of the signal generating unit 10, the frequency mixing and phase shifting unit 20 and the N transmitting ports (such as Tx1, Tx2, . . . , TxN) can be found in FIG. 6 above, which will not be repeated here.

[0168] Optionally, in order to better realize the transmission of different signals through multiple transmission channels, this signal processing system is equipped with a power amplifier (PA) in each channel, so that the N generated RF signals can be radiated from the antenna through the power amplifier, thereby improving the detection capability of the RF signal.

[0169] Optionally, the frequency mixing and phase shifting unit 20 in the signal processing system is configured to perform frequency mixing and phase shifting on the first baseband signal, the second baseband signal, and the first local oscillator signal (LO_RF), respectively, to obtain N RF signals (RF signal 1, RF signal 2, ..., RF signal N). It is understood that the frequency mixing and phase shifting unit 20 here can perform one or more frequency mixing and phase shifting on the first baseband signal, the second baseband signal, and the first local oscillator signal (LO_RF), and can perform frequency mixing first and then phase shifting, or can perform phase shifting first and then mixing, etc., and this application does not impose any restrictions on this.

[0170] Through the above signal processing, the N generated RF signals can be of arbitrary waveforms. Furthermore, compared to the signal processing system shown in Figure 4 , this signal processing system generates the N RF signals without feedback adjustments like those from analog devices such as phase-locked loops (PLLs). This allows for better linearity and shorter settling times, thereby addressing the issues of poor linearity and long settling times currently encountered in analog modulation radars. Furthermore, compared to the signal processing system shown in Figure 5 , this signal processing system eliminates the need for independent DAC groups for each channel in order to transmit different signals across multiple transmit channels. This reduces hardware complexity, power consumption, and costs.

[0171] Please refer to Figures 8 and 9, which are schematic diagrams of the structures of two signal processing systems provided in embodiments of the present application. It is understood that the signal processing systems shown in Figures 8 and 9 can be implemented as separate embodiments, or the signal processing systems shown in Figures 8 and 9 can also be understood as variations or supplements to the signal processing systems in Figures 6 or 7 above.

[0172] As shown in Figures 8 and 9, the signal processing system includes a signal generating unit 10, a frequency mixing and phase shifting unit 20, and N transmitting ports (eg, Tx1, Tx2, ..., TxN), where N is a positive integer.

[0173] The signal generating unit 10 is configured to generate a baseband signal, wherein the baseband signal includes a first baseband signal and a second baseband signal that are orthogonal to each other.

[0174] Optionally, the signal generating unit 10 may be implemented in a variety of ways. Two possible implementations are provided below:

[0175] Implementation method one:

[0176] In a possible embodiment, the signal generating unit 10 includes a first digital-to-analog converter 101 and a second digital-to-analog converter 102 , as shown in FIG8 .

[0177] The first digital-to-analog converter 101 is configured to perform digital-to-analog conversion on an input first digital signal to obtain a first baseband signal, and the second digital-to-analog converter 102 is configured to perform digital-to-analog conversion on an input second digital signal to obtain a second baseband signal. The first and second digital-to-analog converters in the signal generation unit can generate mutually orthogonal first and second baseband signals.

[0178] Implementation method 2:

[0179] In another possible embodiment, the signal generating unit 10 includes a first phase shifter 103 and a second phase shifter 104 , as shown in FIG9 .

[0180] The first phase shifter 103 is configured to perform phase shifting on the input first digital signal and the third local oscillator signal (LO_BB) to generate a first baseband signal. The second phase shifter 104 is configured to perform phase shifting on the input second digital signal and the third local oscillator signal (LO_BB) to generate a second baseband signal. The frequency of the third local oscillator signal (LO_BB) differs from the frequency of the first local oscillator signal (LO_RF). The first and second phase shifters in the signal generation unit can generate mutually orthogonal first and second baseband signals.

[0181] It is understood that the above-mentioned embodiments 1 and 2 are merely described as two possible implementations of the signal generating unit 10 and should not be used to limit the embodiments of the present application. Reasonable variations or supplements based on the above-mentioned embodiments 1 and 2 should be protected as possible implementations of the signal generating unit 10 provided in this application.

[0182] In addition, the functions of the frequency mixing and phase shifting unit 20 and the N transmitting ports (Tx1, Tx2, ..., TxN) shown in FIG8 and FIG9 are as follows:

[0183] The mixing and phase-shifting unit 20 is configured to process the baseband signal, i.e., perform mixing and phase-shifting on the first baseband signal and the second baseband signal to obtain N RF signals (RF signal 1, RF signal 2, ..., RF signal N). It is understood that the mixing and phase-shifting unit 20 may perform one or more mixing and phase-shifting operations on the first baseband signal and the second baseband signal, and may perform mixing first and then phase-shifting, or may perform phase-shifting first and then mixing, etc., and this application does not impose any limitation on this.

[0184] N transmitting ports (Tx1, Tx2, ..., TxN) are used to transmit N RF signals (RF signal 1, RF signal 2, ..., RF signal N) obtained by the frequency mixing and phase shifting unit 20, so that the N RF signals can be transmitted from the N transmitting ports respectively. For example, the transmitting port Tx1 is used to transmit RF signal 1, the transmitting port Tx2 is used to transmit RF signal 2, the transmitting port TxN is used to transmit RF signal N, and so on. This application does not impose any restrictions on this. The phases or frequencies of the N RF signals are different from each other, that is, the phases or frequencies between the above-mentioned RF signal 1, RF signal 2, ..., and RF signal N are different from each other.

[0185] Through the above signal processing, the N generated RF signals can be of arbitrary waveforms. Furthermore, compared to the signal processing system shown in Figure 4 , this signal processing system generates the N RF signals without feedback adjustments like those from analog devices such as phase-locked loops (PLLs). This allows for better linearity and shorter settling times, thereby addressing the issues of poor linearity and long settling times currently encountered in analog modulation radars. Furthermore, compared to the signal processing system shown in Figure 5 , this signal processing system eliminates the need for independent DAC groups for each channel in order to transmit different signals across multiple transmit channels. This reduces hardware complexity, power consumption, and costs.

[0186] Please refer to FIG10 , which is a schematic structural diagram of a signal processing system provided in an embodiment of the present application.

[0187] It can be understood that the signal processing system shown in FIG10 can be implemented as a separate embodiment, or the signal processing system shown in FIG10 can also be understood as a variation or supplement of the signal processing systems in FIG6 to FIG9 above.

[0188] As shown in Fig. 10, the signal processing system includes a signal generating unit 10, a frequency mixing and phase shifting unit 20, and N transmitting ports (eg, Tx1, Tx2, ..., TxN), where N is a positive integer.

[0189] The signal generating unit 10 is configured to generate a baseband signal, wherein the baseband signal includes a first baseband signal and a second baseband signal that are orthogonal to each other.

[0190] Optionally, the signal generating unit 10 may be implemented in various embodiments, such as the signal generating unit in the signal processing system shown in FIG. 8 or FIG. 9 , which will not be described in detail here.

[0191] It is understood that the signal generation unit in the signal processing system shown in Figures 8 or 9 is merely described as two possible implementations of the signal generation unit 10 and should not be used to limit the embodiments of the present application. Reasonable variations or supplements to the signal generation unit in the signal processing system shown in Figures 8 or 9 should be protected as possible implementations of the signal generation unit 10 provided in this application.

[0192] In addition, the functions of the frequency mixing and phase shifting unit 20 and the N transmitting ports (Tx1, Tx2, ..., TxN) shown in FIG10 are as follows:

[0193] The mixing and phase-shifting unit 20 is configured to process the baseband signal, i.e., perform mixing and phase-shifting on the first baseband signal and the second baseband signal to obtain N RF signals (RF signal 1, RF signal 2, ..., RF signal N). It is understood that the mixing and phase-shifting unit 20 may perform one or more mixing and phase-shifting operations on the first baseband signal and the second baseband signal, and may perform mixing first and then phase-shifting, or may perform phase-shifting first and then mixing, etc., and this application does not impose any limitation on this.

[0194] Specifically, the frequency mixing and phase shifting unit 20 includes a first frequency mixing unit 201 and a first phase shifting unit 202 .

[0195] The functions of the first frequency mixing unit 201 and the first phase shifting unit 202 are as follows:

[0196] The first mixing unit 201 is configured to perform mixing processing on a baseband signal generated by the signal generating unit 10 , and specifically perform mixing processing on the first baseband signal and the first local oscillator signal (LO_RF) to obtain a first mixed signal.

[0197] The first phase shift unit 202 is configured to perform phase shift processing on the first mixed signal to obtain N radio frequency signals. The phases or frequencies of the N radio frequency signals are different from each other.

[0198] By using the above-mentioned method of first mixing and then phase shifting, the N generated RF signals can be arbitrary waveforms, and there is no feedback adjustment of analog devices during the generation process, which can achieve better linearity and shorter stabilization time.

[0199] N transmitting ports (Tx1, Tx2, ..., TxN) are used to transmit N RF signals (RF signal 1, RF signal 2, ..., RF signal N) obtained by the frequency mixing and phase shifting unit 20, so that the N RF signals can be transmitted from the N transmitting ports respectively. For example, the transmitting port Tx1 is used to transmit RF signal 1, the transmitting port Tx2 is used to transmit RF signal 2, the transmitting port TxN is used to transmit RF signal N, and so on. This application does not impose any restrictions on this. The phases or frequencies of the N RF signals are different from each other, that is, the phases or frequencies between the above-mentioned RF signal 1, RF signal 2, ..., and RF signal N are different from each other.

[0200] Through the above signal processing, the N generated RF signals can be of arbitrary waveforms. Furthermore, compared to the signal processing system shown in Figure 4 , this signal processing system generates the N RF signals without feedback adjustments like those from analog devices such as phase-locked loops (PLLs). This allows for better linearity and shorter settling times, thereby addressing the issues of poor linearity and long settling times currently encountered in analog modulation radars. Furthermore, compared to the signal processing system shown in Figure 5 , this signal processing system eliminates the need for independent DAC groups for each channel in order to transmit different signals across multiple transmit channels. This reduces hardware complexity, power consumption, and costs.

[0201] Please refer to FIG11 , which is a schematic structural diagram of a signal processing system provided in an embodiment of the present application.

[0202] It can be understood that the signal processing system shown in FIG11 can be implemented as a separate embodiment, or the signal processing system shown in FIG11 can also be understood as a variation or supplement of the signal processing system in FIG10 described above.

[0203] As shown in FIG11 , the signal processing system includes a signal generating unit 10 , a frequency mixing and phase shifting unit 20 , and N transmitting ports (eg, Tx1 , Tx2 , . . . , TxN), where N is a positive integer.

[0204] The signal generating unit 10 is configured to generate a baseband signal, wherein the baseband signal includes a first baseband signal and a second baseband signal that are orthogonal to each other.

[0205] Optionally, the signal generating unit 10 may be implemented in various embodiments, such as the signal generating unit in the signal processing system shown in FIG. 8 or FIG. 9 , which will not be described in detail here.

[0206] It is understood that the signal generation unit in the signal processing system shown in Figures 8 or 9 is merely described as two possible implementations of the signal generation unit 10 and should not be used to limit the embodiments of the present application. Reasonable variations or supplements to the signal generation unit in the signal processing system shown in Figures 8 or 9 should be protected as possible implementations of the signal generation unit 10 provided in this application.

[0207] In addition, the functions of the frequency mixing and phase shifting unit 20 and the N transmitting ports (Tx1, Tx2, ..., TxN) shown in FIG11 are as follows:

[0208] The mixing and phase-shifting unit 20 is configured to process the baseband signal, i.e., perform mixing and phase-shifting on the first baseband signal and the second baseband signal to obtain N RF signals (RF signal 1, RF signal 2, ..., RF signal N). It is understood that the mixing and phase-shifting unit 20 may perform one or more mixing and phase-shifting operations on the first baseband signal and the second baseband signal, and may perform mixing first and then phase-shifting, or may perform phase-shifting first and then mixing, etc., and this application does not impose any limitation on this.

[0209] Specifically, the frequency mixing and phase shifting unit 20 includes a first frequency mixing unit 201 and a first phase shifting unit 202 .

[0210] The functions of the first frequency mixing unit 201 and the first phase shifting unit 202 are as follows:

[0211] The first mixing unit 201 is configured to perform mixing processing on a baseband signal generated by the signal generating unit 10 , and specifically perform mixing processing on the first baseband signal and the first local oscillator signal (LO_RF) to obtain a first mixed signal.

[0212] The first phase shift unit 202 is configured to perform phase shift processing on the first mixed signal to obtain N radio frequency signals. The phases or frequencies of the N radio frequency signals are different from each other.

[0213] By using the above-mentioned method of first mixing and then phase shifting, the N generated RF signals can be arbitrary waveforms, and there is no feedback adjustment of analog devices during the generation process, which can achieve better linearity and shorter stabilization time.

[0214] Furthermore, the first frequency mixing unit 201 includes a first frequency mixing module, which includes a first mixer 2001 and a second mixer 2002 .

[0215] The functions of the first mixer 2001 and the second mixer 2002 are as follows:

[0216] The first mixer 2001 is configured to perform mixing processing on a first baseband signal and a first local oscillator signal (LO_RF).

[0217] The second mixer 2002 is configured to perform mixing processing on the second baseband signal and the first local oscillator signal (LO_RF).

[0218] It can be understood that the first mixer 2001 and the second mixer 2002 in the embodiment of the present application may be two independent mixers, or may be two mixing devices in an IQ mixer.

[0219] Through the first mixer and the second mixer included in the above-mentioned first mixing module, it is possible to perform mixing processing on a baseband signal (including the first baseband signal and the second baseband signal) and output a first mixed signal.

[0220] Furthermore, the first phase shifting unit 202 includes N phase shifters 2003 .

[0221] The functions of the N phase shifters 2003 are as follows:

[0222] The N phase shifters 2003 are used to perform phase shift processing on the N sub-mixing signals corresponding to the first mixing signal obtained by the first mixing unit 201 to obtain N RF signals (RF signal 1, RF signal 2, ..., RF signal N).

[0223] It is understandable that the first mixing signal can be N corresponding sub-mixing signals obtained after power division, and the N sub-mixing signals are the same, and the phases or frequencies of the corresponding N RF signals obtained after phase shifting are different from each other.

[0224] The N phase shifters included in the first phase shifting unit can realize an RF signal of arbitrary waveform, and there is no feedback adjustment of analog devices during the generation process, which can achieve good linearity and short stabilization time, thereby solving the problems of poor linearity and long stabilization time in current analog modulation radars.

[0225] N transmitting ports (Tx1, Tx2, ..., TxN) are used to transmit N RF signals (RF signal 1, RF signal 2, ..., RF signal N) obtained by the frequency mixing and phase shifting unit 20, so that the N RF signals can be transmitted from the N transmitting ports respectively. For example, the transmitting port Tx1 is used to transmit RF signal 1, the transmitting port Tx2 is used to transmit RF signal 2, the transmitting port TxN is used to transmit RF signal N, and so on. This application does not impose any restrictions on this. The phases or frequencies of the N RF signals are different from each other, that is, the phases or frequencies between the above-mentioned RF signal 1, RF signal 2, ..., and RF signal N are different from each other.

[0226] Through the above signal processing, the N generated RF signals can be of arbitrary waveforms. Furthermore, compared to the signal processing system shown in Figure 4 , this signal processing system generates the N RF signals without feedback adjustments like those from analog devices such as phase-locked loops (PLLs). This allows for better linearity and shorter settling times, thereby addressing the issues of poor linearity and long settling times currently encountered in analog modulation radars. Furthermore, compared to the signal processing system shown in Figure 5 , this signal processing system eliminates the need for independent DAC groups for each channel in order to transmit different signals across multiple transmit channels. This reduces hardware complexity, power consumption, and costs.

[0227] Please refer to FIG12 , which is a schematic structural diagram of a signal processing system provided in an embodiment of the present application.

[0228] It can be understood that the signal processing system shown in FIG12 can be implemented as a separate embodiment, or the signal processing system shown in FIG12 can also be understood as a variation or supplement of the signal processing systems in FIG6 to FIG9 above.

[0229] As shown in FIG12 , the signal processing system includes a signal generating unit 10 , a frequency mixing and phase shifting unit 20 , and N transmitting ports (eg, Tx1 , Tx2 , . . . , TxN), where N is a positive integer.

[0230] The signal generating unit 10 is configured to generate a baseband signal, wherein the baseband signal includes a first baseband signal and a second baseband signal that are orthogonal to each other.

[0231] Optionally, the signal generating unit 10 may be implemented in various embodiments, such as the signal generating unit in the signal processing system shown in FIG. 8 or FIG. 9 , which will not be described in detail here.

[0232] It is understood that the signal generation unit in the signal processing system shown in Figures 8 or 9 is merely described as two possible implementations of the signal generation unit 10 and should not be used to limit the embodiments of the present application. Reasonable variations or supplements to the signal generation unit in the signal processing system shown in Figures 8 or 9 should be protected as possible implementations of the signal generation unit 10 provided in this application.

[0233] In addition, the functions of the frequency mixing and phase shifting unit 20 and the N transmitting ports (Tx1, Tx2, ..., TxN) shown in FIG12 are as follows:

[0234] The mixing and phase-shifting unit 20 is configured to process the baseband signal, i.e., perform mixing and phase-shifting on the first baseband signal and the second baseband signal to obtain N RF signals (RF signal 1, RF signal 2, ..., RF signal N). It is understood that the mixing and phase-shifting unit 20 may perform one or more mixing and phase-shifting operations on the first baseband signal and the second baseband signal, and may perform mixing first and then phase-shifting, or may perform phase-shifting first and then mixing, etc., and this application does not impose any limitation on this.

[0235] Specifically, the frequency mixing and phase shifting unit 20 includes a second phase shifting unit 203 and a second frequency mixing unit 204 .

[0236] The functions of the second phase shifting unit 203 and the second frequency mixing unit 204 are as follows:

[0237] The second phase shift unit 203 is configured to perform phase shift processing on the first local oscillator signal (LO_RF) to obtain N phase shift signals (phase shift signal 1, phase shift signal 2, ..., phase shift signal N). The phases of the N phase shift signals are different from each other.

[0238] The second mixing unit 204 is configured to perform mixing processing on the N sub-baseband signals and the N phase-shifted signals corresponding to the baseband signal generated by the signal generating unit 10. Specifically, the second mixing unit 204 is configured to perform mixing processing on a baseband signal among the N baseband signals and a phase-shifted signal among the N phase-shifted signals to obtain N RF signals, where the phases or frequencies of the N RF signals are different from each other.

[0239] By using the above-mentioned method of first phase shifting and then mixing, the N generated RF signals can be arbitrary waveforms, and there is no feedback adjustment of analog devices during the generation process, which can achieve better linearity and shorter stabilization time.

[0240] N transmitting ports (Tx1, Tx2, ..., TxN) are used to transmit N RF signals (RF signal 1, RF signal 2, ..., RF signal N) obtained by the frequency mixing and phase shifting unit 20, so that the N RF signals can be transmitted from the N transmitting ports respectively. For example, the transmitting port Tx1 is used to transmit RF signal 1, the transmitting port Tx2 is used to transmit RF signal 2, the transmitting port TxN is used to transmit RF signal N, and so on. This application does not impose any restrictions on this. The phases or frequencies of the N RF signals are different from each other, that is, the phases or frequencies between the above-mentioned RF signal 1, RF signal 2, ..., and RF signal N are different from each other.

[0241] Through the above signal processing, the N generated RF signals can be of arbitrary waveforms. Furthermore, compared to the signal processing system shown in Figure 4 , this signal processing system generates the N RF signals without feedback adjustments like those from analog devices such as phase-locked loops (PLLs). This allows for better linearity and shorter settling times, thereby addressing the issues of poor linearity and long settling times currently encountered in analog modulation radars. Furthermore, compared to the signal processing system shown in Figure 5 , this signal processing system eliminates the need for independent DAC groups for each channel in order to transmit different signals across multiple transmit channels. This reduces hardware complexity, power consumption, and costs.

[0242] Please refer to FIG13 , which is a schematic structural diagram of a signal processing system provided in an embodiment of the present application.

[0243] It can be understood that the signal processing system shown in FIG13 can be implemented as a separate embodiment, or the signal processing system shown in FIG13 can also be understood as a variation or supplement of the signal processing system in FIG12 above.

[0244] As shown in FIG13 , the signal processing system includes a signal generating unit 10 , a frequency mixing and phase shifting unit 20 , and N transmitting ports (eg, Tx1 , Tx2 , . . . , TxN), where N is a positive integer.

[0245] The signal generating unit 10 is configured to generate a baseband signal, wherein the baseband signal includes a first baseband signal and a second baseband signal that are orthogonal to each other.

[0246] Optionally, the signal generating unit 10 may be implemented in various embodiments, such as the signal generating unit in the signal processing system shown in FIG. 8 or FIG. 9 , which will not be described in detail here.

[0247] It is understood that the signal generation unit in the signal processing system shown in Figures 8 or 9 is merely described as two possible implementations of the signal generation unit 10 and should not be used to limit the embodiments of the present application. Reasonable variations or supplements to the signal generation unit in the signal processing system shown in Figures 8 or 9 should be protected as possible implementations of the signal generation unit 10 provided in this application.

[0248] In addition, the functions of the frequency mixing and phase shifting unit 20 and the N transmitting ports (Tx1, Tx2, ..., TxN) shown in FIG13 are as follows:

[0249] The mixing and phase-shifting unit 20 is configured to process the baseband signal, i.e., perform mixing and phase-shifting on the first baseband signal and the second baseband signal to obtain N RF signals (RF signal 1, RF signal 2, ..., RF signal N). It is understood that the mixing and phase-shifting unit 20 may perform one or more mixing and phase-shifting operations on the first baseband signal and the second baseband signal, and may perform mixing first and then phase-shifting, or may perform phase-shifting first and then mixing, etc., and this application does not impose any limitation on this.

[0250] Specifically, the frequency mixing and phase shifting unit 20 includes a second phase shifting unit 203 and a second frequency mixing unit 204 .

[0251] The functions of the second phase shifting unit 203 and the second frequency mixing unit 204 are as follows:

[0252] The second phase shift unit 203 is configured to perform phase shift processing on the first local oscillator signal (LO_RF) to obtain N phase shift signals (phase shift signal 1, phase shift signal 2, ..., phase shift signal N). The phases of the N phase shift signals are different from each other.

[0253] The second mixing unit 204 is configured to perform mixing processing on the N sub-baseband signals and the N phase-shifted signals corresponding to the baseband signal generated by the signal generating unit 10. Specifically, the second mixing unit 204 is configured to perform mixing processing on a baseband signal among the N baseband signals and a phase-shifted signal among the N phase-shifted signals to obtain N RF signals, where the phases or frequencies of the N RF signals are different from each other.

[0254] By using the above-mentioned method of first phase shifting and then mixing, the N generated RF signals can be arbitrary waveforms, and there is no feedback adjustment of analog devices during the generation process, which can achieve better linearity and shorter stabilization time.

[0255] Furthermore, the second phase shifting unit 203 includes N phase shifters 2004 .

[0256] The functions of the N phase shifters 2004 are as follows:

[0257] N phase shifters 2004 are configured to perform phase shifting on N local oscillator signals corresponding to the first local oscillator signal (LO_RF) to generate N phase-shifted signals (phase-shifted signal 1, phase-shifted signal 2, ..., phase-shifted signal N). The first local oscillator signal (LO_RF) may be a power-divided signal that generates N corresponding local oscillator signals, and these N local oscillator signals are identical. The N phase shifters 2004 included in the second phase shifting unit 203 ensure that the phases of the N corresponding phase-shifted signals generated after the phase shifting process are different from one another.

[0258] Furthermore, the second frequency mixing unit 204 includes N frequency mixing modules, and the second frequency mixing module among the N frequency mixing modules includes a third mixer 2005 and a fourth mixer 2006 .

[0259] The functions of the third mixer 2005 and the fourth mixer 2006 are as follows:

[0260] The third mixer 2005 is configured to perform mixing processing on the first sub-baseband signal corresponding to the first baseband signal and the first phase-shifted signal (phase-shifted signal 1 ) among the N phase-shifted signals obtained by the second phase-shifting unit.

[0261] The fourth mixer 2006 is configured to perform mixing processing on the second sub-baseband signal corresponding to the second baseband signal and the first phase-shifted signal (phase-shifted signal 1) among the N phase-shifted signals obtained by the second phase-shifting unit.

[0262] It is understood that the third mixer 2005 and the fourth mixer 2006 can be two independent mixers or two mixing devices in a single IQ mixer. The first sub-baseband signal corresponding to the first baseband signal can be a first sub-baseband signal from among the N first sub-baseband signals obtained after power division of the first baseband signal, and the N first sub-baseband signals are identical. The second sub-baseband signal corresponding to the second baseband signal can be a second sub-baseband signal from among the N second sub-baseband signals obtained after power division of the second baseband signal, and the N second sub-baseband signals are identical.

[0263] Through the third mixer 2005 and the fourth mixer 2006 included in the above-mentioned second mixing module, a radio frequency signal of arbitrary waveform can be output. The N mixing modules in the second mixing unit include the above-mentioned second mixing module, which can achieve that the phases or frequencies of the output N radio frequency signals of arbitrary waveforms (radio frequency signal 1, radio frequency signal 2, ..., radio frequency signal N) are different from each other, and there is no feedback adjustment of analog devices in the generation process, which can achieve better linearity and shorter stabilization time, thereby solving the problems of poor linearity and long stabilization time existing in current analog modulation radars.

[0264] N transmitting ports (Tx1, Tx2, ..., TxN) are used to transmit N RF signals (RF signal 1, RF signal 2, ..., RF signal N) obtained by the frequency mixing and phase shifting unit 20, so that the N RF signals can be transmitted from the N transmitting ports respectively. For example, the transmitting port Tx1 is used to transmit RF signal 1, the transmitting port Tx2 is used to transmit RF signal 2, the transmitting port TxN is used to transmit RF signal N, and so on. This application does not impose any restrictions on this. The phases or frequencies of the N RF signals are different from each other, that is, the phases or frequencies between the above-mentioned RF signal 1, RF signal 2, ..., and RF signal N are different from each other.

[0265] Through the above signal processing, the N generated RF signals can be of arbitrary waveforms. Furthermore, compared to the signal processing system shown in Figure 4 , this signal processing system generates the N RF signals without feedback adjustments like those from analog devices such as phase-locked loops (PLLs). This allows for better linearity and shorter settling times, thereby addressing the issues of poor linearity and long settling times currently encountered in analog modulation radars. Furthermore, compared to the signal processing system shown in Figure 5 , this signal processing system eliminates the need for independent DAC groups for each channel in order to transmit different signals across multiple transmit channels. This reduces hardware complexity, power consumption, and costs.

[0266] Please refer to FIG. 14 , which is a schematic structural diagram of a signal processing system provided in an embodiment of the present application.

[0267] It can be understood that the signal processing system shown in FIG14 can be implemented as a separate embodiment, or the signal processing system shown in FIG14 can also be understood as a variation or supplement of the signal processing systems in FIG6 to FIG9 above.

[0268] As shown in FIG14 , the signal processing system includes a signal generating unit 10 , a frequency mixing and phase shifting unit 20 , and N transmitting ports (eg, Tx1 , Tx2 , . . . , TxN), where N is a positive integer.

[0269] The signal generating unit 10 is configured to generate a baseband signal, wherein the baseband signal includes a first baseband signal and a second baseband signal that are orthogonal to each other.

[0270] Optionally, the signal generating unit 10 may be implemented in various embodiments, such as the signal generating unit in the signal processing system shown in FIG. 8 or FIG. 9 , which will not be described in detail here.

[0271] It is understood that the signal generation unit in the signal processing system shown in Figures 8 or 9 is merely described as two possible implementations of the signal generation unit 10 and should not be used to limit the embodiments of the present application. Reasonable variations or supplements to the signal generation unit in the signal processing system shown in Figures 8 or 9 should be protected as possible implementations of the signal generation unit 10 provided in this application.

[0272] In addition, the functions of the frequency mixing and phase shifting unit 20 and the N transmitting ports (Tx1, Tx2, ..., TxN) shown in FIG14 are as follows:

[0273] The mixing and phase-shifting unit 20 is configured to process the baseband signal, i.e., perform mixing and phase-shifting on the first baseband signal and the second baseband signal to obtain N RF signals (RF signal 1, RF signal 2, ..., RF signal N). It is understood that the mixing and phase-shifting unit 20 may perform one or more mixing and phase-shifting operations on the first baseband signal and the second baseband signal, and may perform mixing first and then phase-shifting, or may perform phase-shifting first and then mixing, etc., and this application does not impose any limitation on this.

[0274] Specifically, the frequency mixing and phase shifting unit 20 includes a third phase shifting unit 205 and a third frequency mixing unit 206 .

[0275] The functions of the third phase shifting unit 205 and the third frequency mixing unit 206 are as follows:

[0276] The third phase shifting unit 205 is configured to perform phase shift processing on the first baseband signal to obtain N first phase-shifted signals, and perform phase shift processing on the second baseband signal to obtain N second phase-shifted signals, wherein the phases of the N first phase-shifted signals are different from each other, and the phases of the N second phase-shifted signals are different from each other.

[0277] The third mixing unit 206 is used to perform mixing processing on the N first phase-shifted signals and the N second phase-shifted signals obtained by the third phase-shifting unit, respectively. Specifically, mixing processing can be performed on a first phase-shifted signal among the N first phase-shifted signals and a second phase-shifted signal among the N second phase-shifted signals, respectively, to obtain N RF signals (RF signal 1, RF signal 2, ..., RF signal N), wherein the phases or frequencies of the N RF signals are different from each other.

[0278] By using the above-mentioned method of first phase shifting and then mixing, the N generated RF signals can be arbitrary waveforms, and there is no feedback adjustment of analog devices during the generation process, which can achieve better linearity and shorter stabilization time.

[0279] N transmitting ports (Tx1, Tx2, ..., TxN) are used to transmit N RF signals (RF signal 1, RF signal 2, ..., RF signal N) obtained by the frequency mixing and phase shifting unit 20, so that the N RF signals can be transmitted from the N transmitting ports respectively. For example, the transmitting port Tx1 is used to transmit RF signal 1, the transmitting port Tx2 is used to transmit RF signal 2, the transmitting port TxN is used to transmit RF signal N, and so on. This application does not impose any restrictions on this. The phases or frequencies of the N RF signals are different from each other, that is, the phases or frequencies between the above-mentioned RF signal 1, RF signal 2, ..., and RF signal N are different from each other.

[0280] Through the above signal processing, the N generated RF signals can be of arbitrary waveforms. Furthermore, compared to the signal processing system shown in Figure 4 , this signal processing system generates the N RF signals without feedback adjustments like those from analog devices such as phase-locked loops (PLLs). This allows for better linearity and shorter settling times, thereby addressing the issues of poor linearity and long settling times currently encountered in analog modulation radars. Furthermore, compared to the signal processing system shown in Figure 5 , this signal processing system eliminates the need for independent DAC groups for each channel in order to transmit different signals across multiple transmit channels. This reduces hardware complexity, power consumption, and costs.

[0281] Please refer to FIG. 15 , which is a schematic structural diagram of a signal processing system provided in an embodiment of the present application.

[0282] It can be understood that the signal processing system shown in FIG15 can be implemented as a separate embodiment, or the signal processing system shown in FIG15 can also be understood as a variation or supplement of the signal processing system in FIG14 above.

[0283] As shown in FIG15 , the signal processing system includes a signal generating unit 10 , a frequency mixing and phase shifting unit 20 , and N transmitting ports (eg, Tx1 , Tx2 , . . . , TxN), where N is a positive integer.

[0284] The signal generating unit 10 is configured to generate a baseband signal, wherein the baseband signal includes a first baseband signal and a second baseband signal that are orthogonal to each other.

[0285] Optionally, the signal generating unit 10 may be implemented in various embodiments, such as the signal generating unit in the signal processing system shown in FIG. 8 or FIG. 9 , which will not be described in detail here.

[0286] It is understood that the signal generation unit in the signal processing system shown in Figures 8 or 9 is merely described as two possible implementations of the signal generation unit 10 and should not be used to limit the embodiments of the present application. Reasonable variations or supplements to the signal generation unit in the signal processing system shown in Figures 8 or 9 should be protected as possible implementations of the signal generation unit 10 provided in this application.

[0287] In addition, the functions of the frequency mixing and phase shifting unit 20 and the N transmitting ports (Tx1, Tx2, ..., TxN) shown in FIG15 are as follows:

[0288] The mixing and phase-shifting unit 20 is configured to process the baseband signal, i.e., perform mixing and phase-shifting on the first baseband signal and the second baseband signal to obtain N RF signals (RF signal 1, RF signal 2, ..., RF signal N). It is understood that the mixing and phase-shifting unit 20 may perform one or more mixing and phase-shifting operations on the first baseband signal and the second baseband signal, and may perform mixing first and then phase-shifting, or may perform phase-shifting first and then mixing, etc., and this application does not impose any limitation on this.

[0289] Specifically, the frequency mixing and phase shifting unit 20 includes a third phase shifting unit 205 and a third frequency mixing unit 206 .

[0290] The functions of the third phase shifting unit 205 and the third frequency mixing unit 206 are as follows:

[0291] The third phase shifting unit 205 is configured to perform phase shift processing on the first baseband signal to obtain N first phase-shifted signals, and perform phase shift processing on the second baseband signal to obtain N second phase-shifted signals, wherein the phases of the N first phase-shifted signals are different from each other, and the phases of the N second phase-shifted signals are different from each other.

[0292] The third mixing unit 206 is used to perform mixing processing on the N first phase-shifted signals and the N second phase-shifted signals obtained by the third phase-shifting unit, respectively. Specifically, mixing processing can be performed on a first phase-shifted signal among the N first phase-shifted signals and a second phase-shifted signal among the N second phase-shifted signals, respectively, to obtain N RF signals (RF signal 1, RF signal 2, ..., RF signal N), wherein the phases or frequencies of the N RF signals are different from each other.

[0293] By using the above-mentioned method of first phase shifting and then mixing, the N generated RF signals can be arbitrary waveforms, and there is no feedback adjustment of analog devices during the generation process, which can achieve better linearity and shorter stabilization time.

[0294] Furthermore, the third phase shifting unit 205 includes 2N phase shifters 2007 .

[0295] The functions of the 2N phase shifters 2007 are as follows:

[0296] The 2i-1th phase shifter among the 2N phase shifters 2007 is configured to perform phase shift processing on the N sub-baseband signals corresponding to the first baseband signal to obtain N first phase-shifted signals.

[0297] The 2i-th phase shifter among the 2N phase shifters 2007 is configured to perform phase shift processing on the N sub-baseband signals corresponding to the second baseband signal to obtain N second phase-shifted signals.

[0298] It is understood that the first baseband signal may be N corresponding sub-baseband signals obtained after power division, and the N baseband signals are identical, and the phases of the N first phase-shifted signals obtained after phase shifting are different from each other. The second baseband signal may be N corresponding sub-baseband signals obtained after power division, and the N baseband signals are identical, and the phases of the N second phase-shifted signals obtained after phase shifting are different from each other.

[0299] The 2N phase shifters 2007 included in the third phase shift unit can achieve an effect in which the phases of the N first phase-shifted signals obtained after phase shifting are different from each other, and an effect in which the phases of the N second phase-shifted signals are different from each other.

[0300] Furthermore, the third frequency mixing unit 206 includes N frequency mixing modules, and the third frequency mixing module among the N frequency mixing modules includes a fifth mixer 2008 and a sixth mixer 2009 .

[0301] The functions of the fifth mixer 2008 and the sixth mixer 2009 are as follows:

[0302] The fifth mixer 2008 is configured to perform mixing processing on the first local oscillator signal (LO_RF) and one of the N first phase-shifted signals obtained by the third phase-shifting unit.

[0303] The sixth mixer 2009 is configured to perform mixing processing on the first local oscillator signal (LO_RF) and one of the N second phase-shifted signals obtained by the third phase-shifting unit.

[0304] It can be understood that the fifth mixer 2008 and the sixth mixer 2009 can be two independent mixers, or can be two mixing devices in one IQ mixer.

[0305] Through the fifth mixer 2008 and the sixth mixer 2009 included in the above-mentioned third mixing module, a radio frequency signal of arbitrary waveform can be output. The N mixing modules in the third mixing unit include the above-mentioned third mixing module, which can achieve that the phases or frequencies of the output N radio frequency signals of arbitrary waveforms (radio frequency signal 1, radio frequency signal 2, ..., radio frequency signal N) are different from each other, and there is no feedback adjustment of analog devices in the generation process, which can achieve better linearity and shorter stabilization time, thereby solving the problems of poor linearity and long stabilization time in current analog modulation radars.

[0306] N transmitting ports (Tx1, Tx2, ..., TxN) are used to transmit N RF signals (RF signal 1, RF signal 2, ..., RF signal N) obtained by the frequency mixing and phase shifting unit 20, so that the N RF signals can be transmitted from the N transmitting ports respectively. For example, the transmitting port Tx1 is used to transmit RF signal 1, the transmitting port Tx2 is used to transmit RF signal 2, the transmitting port TxN is used to transmit RF signal N, and so on. This application does not impose any restrictions on this. The phases or frequencies of the N RF signals are different from each other, that is, the phases or frequencies between the above-mentioned RF signal 1, RF signal 2, ..., and RF signal N are different from each other.

[0307] Through the above signal processing, the N generated RF signals can be of arbitrary waveforms. Furthermore, compared to the signal processing system shown in Figure 4 , this signal processing system generates the N RF signals without feedback adjustments like those from analog devices such as phase-locked loops (PLLs). This allows for better linearity and shorter settling times, thereby addressing the issues of poor linearity and long settling times currently encountered in analog modulation radars. Furthermore, compared to the signal processing system shown in Figure 5 , this signal processing system eliminates the need for independent DAC groups for each channel in order to transmit different signals across multiple transmit channels. This reduces hardware complexity, power consumption, and costs.

[0308] Please refer to FIG. 16 , which is a schematic structural diagram of a signal processing system provided in an embodiment of the present application.

[0309] It can be understood that the signal processing system shown in FIG16 can be implemented as a separate embodiment, or the signal processing system shown in FIG16 can also be understood as a variation or supplement of the signal processing systems in FIG6 to FIG9 above.

[0310] As shown in FIG16 , the signal processing system includes a signal generating unit 10 , a frequency mixing and phase shifting unit 20 , and N transmitting ports (eg, Tx1 , Tx2 , . . . , TxN), where N is a positive integer.

[0311] The signal generating unit 10 is configured to generate a baseband signal, wherein the baseband signal includes a first baseband signal and a second baseband signal that are orthogonal to each other.

[0312] Optionally, the signal generating unit 10 may be implemented in various embodiments, such as the signal generating unit in the signal processing system shown in FIG. 8 or FIG. 9 , which will not be described in detail here.

[0313] It is understood that the signal generation unit in the signal processing system shown in Figures 8 or 9 is merely described as two possible implementations of the signal generation unit 10 and should not be used to limit the embodiments of the present application. Reasonable variations or supplements to the signal generation unit in the signal processing system shown in Figures 8 or 9 should be protected as possible implementations of the signal generation unit 10 provided in this application.

[0314] In addition, the functions of the frequency mixing and phase shifting unit 20 and the N transmitting ports (Tx1, Tx2, ..., TxN) shown in FIG16 are as follows:

[0315] The mixing and phase-shifting unit 20 is configured to process the baseband signal, i.e., perform mixing and phase-shifting on the first baseband signal and the second baseband signal to obtain N RF signals (RF signal 1, RF signal 2, ..., RF signal N). It is understood that the mixing and phase-shifting unit 20 may perform one or more mixing and phase-shifting operations on the first baseband signal and the second baseband signal, and may perform mixing first and then phase-shifting, or may perform phase-shifting first and then mixing, etc., and this application does not impose any limitation on this.

[0316] Specifically, the frequency mixing and phase shifting unit 20 includes a fourth frequency mixing unit 207 and a fifth frequency mixing unit 208 .

[0317] The functions of the fourth frequency mixing unit 207 and the fifth frequency mixing unit 208 are as follows:

[0318] The fourth mixing unit 207 is configured to perform mixing processing on each of the N second local oscillator signals (LO_DF1, LO_DF2, ..., LO_DFN), the quadrature signal corresponding to each second local oscillator signal, and the N sub-baseband signals corresponding to the first baseband signal, to obtain N first mixed signals; and to perform mixing processing on each of the N second local oscillator signals (LO_DF1, LO_DF2, ..., LO_DFN), the quadrature signal corresponding to each second local oscillator signal, and the N sub-baseband signals corresponding to the second baseband signal, to obtain N second mixed signals. The N first mixed signals have different phases, and the N second mixed signals have different phases.

[0319] The fifth mixing unit 208 is used to perform mixing processing on the N first mixing signals and the N second mixing signals obtained by the fourth mixing unit, respectively. Specifically, it can be used to perform mixing processing on a first mixing signal among the N first mixing signals and a second mixing signal among the N second mixing signals, respectively, to obtain N RF signals (RF signal 1, RF signal 2, ..., RF signal N), wherein the phases or frequencies of the N RF signals are different from each other.

[0320] By using the above-mentioned method of first phase shifting and then mixing, the N generated RF signals can be arbitrary waveforms, and there is no feedback adjustment of analog devices during the generation process, which can achieve better linearity and shorter stabilization time.

[0321] Optionally, the frequencies of the N second local oscillator signals (LO_DF1, LO_DF2, ..., LO_DFN) are different from each other, and the frequencies of the N second local oscillator signals are different from the frequencies of the first local oscillator signal and the third local oscillator signal.

[0322] By obtaining N first mixing signals and N second mixing signals from N second local oscillation signals (LO_DF1, LO_DF2, ..., LO_DFN) with different frequencies, it is possible to achieve mutually different phases between the N first mixing signals and mutually different phases between the N second mixing signals.

[0323] N transmitting ports (Tx1, Tx2, ..., TxN) are used to transmit N RF signals (RF signal 1, RF signal 2, ..., RF signal N) obtained by the frequency mixing and phase shifting unit 20, so that the N RF signals can be transmitted from the N transmitting ports respectively. For example, the transmitting port Tx1 is used to transmit RF signal 1, the transmitting port Tx2 is used to transmit RF signal 2, the transmitting port TxN is used to transmit RF signal N, and so on. This application does not impose any restrictions on this. The phases or frequencies of the N RF signals are different from each other, that is, the phases or frequencies between the above-mentioned RF signal 1, RF signal 2, ..., and RF signal N are different from each other.

[0324] Through the above signal processing, the N generated RF signals can be of arbitrary waveforms. Furthermore, compared to the signal processing system shown in Figure 4 , this signal processing system generates the N RF signals without feedback adjustments like those from analog devices such as phase-locked loops (PLLs). This allows for better linearity and shorter settling times, thereby addressing the issues of poor linearity and long settling times currently encountered in analog modulation radars. Furthermore, compared to the signal processing system shown in Figure 5 , this signal processing system eliminates the need for independent DAC groups for each channel in order to transmit different signals across multiple transmit channels. This reduces hardware complexity, power consumption, and costs.

[0325] Please refer to FIG. 17 , which is a schematic structural diagram of a signal processing system provided in an embodiment of the present application.

[0326] It can be understood that the signal processing system shown in FIG17 can be implemented as a separate embodiment, or the signal processing system shown in FIG17 can also be understood as a variation or supplement of the signal processing system in FIG14 above.

[0327] As shown in FIG17 , the signal processing system includes a signal generating unit 10 , a frequency mixing and phase shifting unit 20 , and N transmitting ports (eg, Tx1 , Tx2 , . . . , TxN), where N is a positive integer.

[0328] The signal generating unit 10 is configured to generate a baseband signal, wherein the baseband signal includes a first baseband signal and a second baseband signal that are orthogonal to each other.

[0329] Optionally, the signal generating unit 10 may be implemented in various embodiments, such as the signal generating unit in the signal processing system shown in FIG. 8 or FIG. 9 , which will not be described in detail here.

[0330] It is understood that the signal generation unit in the signal processing system shown in Figures 8 or 9 is merely described as two possible implementations of the signal generation unit 10 and should not be used to limit the embodiments of the present application. Reasonable variations or supplements to the signal generation unit in the signal processing system shown in Figures 8 or 9 should be protected as possible implementations of the signal generation unit 10 provided in this application.

[0331] In addition, the functions of the frequency mixing and phase shifting unit 20 and the N transmitting ports (Tx1, Tx2, ..., TxN) shown in FIG17 are as follows:

[0332] The mixing and phase-shifting unit 20 is configured to process the baseband signal, i.e., perform mixing and phase-shifting on the first baseband signal and the second baseband signal to obtain N RF signals (RF signal 1, RF signal 2, ..., RF signal N). It is understood that the mixing and phase-shifting unit 20 may perform one or more mixing and phase-shifting operations on the first baseband signal and the second baseband signal, and may perform mixing first and then phase-shifting, or may perform phase-shifting first and then mixing, etc., and this application does not impose any limitation on this.

[0333] Specifically, the frequency mixing and phase shifting unit 20 includes a fourth frequency mixing unit 207 and a fifth frequency mixing unit 208 .

[0334] The functions of the fourth frequency mixing unit 207 and the fifth frequency mixing unit 208 are as follows:

[0335] The fourth mixing unit 207 is configured to perform mixing processing on each of the N second local oscillator signals (LO_DF1, LO_DF2, ..., LO_DFN), the quadrature signal corresponding to each second local oscillator signal, and the N sub-baseband signals corresponding to the first baseband signal, to obtain N first mixed signals; and to perform mixing processing on each of the N second local oscillator signals (LO_DF1, LO_DF2, ..., LO_DFN), the quadrature signal corresponding to each second local oscillator signal, and the N sub-baseband signals corresponding to the second baseband signal, to obtain N second mixed signals. The N first mixed signals have different phases, and the N second mixed signals have different phases.

[0336] The fifth mixing unit 208 is used to perform mixing processing on the N first mixing signals and the N second mixing signals obtained by the fourth mixing unit, respectively. Specifically, it can be used to perform mixing processing on a first mixing signal among the N first mixing signals and a second mixing signal among the N second mixing signals, respectively, to obtain N RF signals (RF signal 1, RF signal 2, ..., RF signal N), wherein the phases or frequencies of the N RF signals are different from each other.

[0337] By using the above-mentioned method of first phase shifting and then mixing, the N generated RF signals can be arbitrary waveforms, and there is no feedback adjustment of analog devices during the generation process, which can achieve better linearity and shorter stabilization time.

[0338] Optionally, the frequencies of the N second local oscillator signals (LO_DF1, LO_DF2, ..., LO_DFN) are different from each other, and the frequencies of the N second local oscillator signals are different from the frequencies of the first local oscillator signal and the third local oscillator signal.

[0339] By obtaining N first mixing signals and N second mixing signals from N second local oscillation signals (LO_DF1, LO_DF2, ..., LO_DFN) with different frequencies, it is possible to achieve mutually different phases between the N first mixing signals and mutually different phases between the N second mixing signals.

[0340] Furthermore, the fourth frequency mixing unit 207 includes 2N frequency mixing modules, and the fourth frequency mixing module among the 2N frequency mixing modules includes a seventh mixer 2010 and an eighth mixer 2011 .

[0341] The functions of the seventh mixer 2010 and the eighth mixer 2011 are as follows:

[0342] The seventh mixer 2010 is configured to perform mixing processing on a second local oscillator signal (LO_DF1) among the N second local oscillator signals (LO_DF1, LO_DF2, ..., LO_DFN) and a first sub-baseband signal corresponding to the first baseband signal.

[0343] The eighth mixer 2011 is configured to perform mixing processing on the quadrature signal corresponding to the second local oscillator signal (LO_DF1) and the first sub-baseband signal corresponding to the first baseband signal.

[0344] It is understood that the seventh mixer 2010 and the eighth mixer 2011 can be two independent mixers or two mixing devices in a single IQ mixer. The first sub-baseband signal can be one of the N corresponding first sub-baseband signals obtained after power division of the first baseband signal.

[0345] Through the seventh mixer 2010 and the eighth mixer 2011 included in the above-mentioned fourth mixing module, a first mixing signal can be output. The 2N mixing modules in the fourth mixing unit include the above-mentioned fourth mixing module, which can output N first mixing signals, and the phases of the N first mixing signals are different from each other.

[0346] Similarly, the fifth mixing module among the 2N mixing modules includes a ninth mixer 2012 and a tenth mixer 2013 .

[0347] The functions of the ninth mixer 2012 and the tenth mixer 2013 are as follows:

[0348] The ninth mixer 2012 is configured to perform mixing processing on one second local oscillator signal (LO_DF1) among the N second local oscillator signals (LO_DF1, LO_DF2, ..., LO_DFN) and a second sub-baseband signal corresponding to the second baseband signal.

[0349] The tenth mixer 2013 is configured to perform mixing processing on the quadrature signal corresponding to the second local oscillator signal (LO_DF1) and the second sub-baseband signal corresponding to the second baseband signal.

[0350] It is understandable that the ninth mixer 2012 and the tenth mixer 2013 may be two independent mixers or two mixing devices in a single IQ mixer. The second sub-baseband signal may be one of the N second sub-baseband signals obtained after power division of the second baseband signal.

[0351] Through the ninth mixer 2012 and the tenth mixer 2013 included in the fifth mixing module, a second mixing signal can be output. The 2N mixing modules in the fourth mixing unit include the fifth mixing module, which can output N second mixing signals, and the phases of the N second mixing signals are different from each other.

[0352] Furthermore, the fifth mixing unit 208 includes N mixing modules, and the sixth mixing module among the N mixing modules includes an eleventh mixer 2014 and a twelfth mixer 2015 .

[0353] The functions of the eleventh mixer 2014 and the twelfth mixer 2015 are as follows:

[0354] The eleventh mixer 2014 is configured to perform mixing processing on the first local oscillator signal (LO_RF) and one first mixed signal among the N first mixed signals obtained by the fourth mixing unit.

[0355] The twelfth mixer 2015 is configured to perform mixing processing on the first local oscillator signal (LO_RF) and one second mixed signal among the N second mixed signals obtained by the fourth mixing unit.

[0356] It can be understood that the eleventh mixer 2014 and the twelfth mixer 2015 can be two independent mixers, or can be two mixing devices in one IQ mixer.

[0357] Through the eleventh mixer 2014 and the twelfth mixer 2015 included in the above-mentioned sixth mixing module, a radio frequency signal of arbitrary waveform can be output. The N mixing modules in the fifth mixing unit include the above-mentioned sixth mixing module, which can achieve that the phases or frequencies of the output N radio frequency signals of arbitrary waveforms (radio frequency signal 1, radio frequency signal 2, ..., radio frequency signal N) are different from each other, and there is no feedback adjustment of analog devices in the generation process, which can achieve better linearity and shorter stabilization time, thereby solving the problems of poor linearity and long stabilization time in current analog modulation radars.

[0358] N transmitting ports (Tx1, Tx2, ..., TxN) are used to transmit N RF signals (RF signal 1, RF signal 2, ..., RF signal N) obtained by the frequency mixing and phase shifting unit 20, so that the N RF signals can be transmitted from the N transmitting ports respectively. For example, the transmitting port Tx1 is used to transmit RF signal 1, the transmitting port Tx2 is used to transmit RF signal 2, the transmitting port TxN is used to transmit RF signal N, and so on. This application does not impose any restrictions on this. The phases or frequencies of the N RF signals are different from each other, that is, the phases or frequencies between the above-mentioned RF signal 1, RF signal 2, ..., and RF signal N are different from each other.

[0359] Through the above signal processing, the N generated RF signals can be of arbitrary waveforms. Furthermore, compared to the signal processing system shown in Figure 4 , this signal processing system generates the N RF signals without feedback adjustments like those from analog devices such as phase-locked loops (PLLs). This allows for better linearity and shorter settling times, thereby addressing the issues of poor linearity and long settling times currently encountered in analog modulation radars. Furthermore, compared to the signal processing system shown in Figure 5 , this signal processing system eliminates the need for independent DAC groups for each channel in order to transmit different signals across multiple transmit channels. This reduces hardware complexity, power consumption, and costs.

[0360] Please refer to FIG. 18 , which is a schematic structural diagram of a signal processing system provided in an embodiment of the present application.

[0361] It can be understood that the signal processing system shown in FIG18 can be implemented as a separate embodiment, or the signal processing system shown in FIG18 can also be understood as a variation or supplement of the signal processing systems in FIG6 to FIG9 above.

[0362] As shown in Figure 18, it includes N transmit (Tx) channels. The digital mode of the transmit signal is stored in random access memory (RAM). After being converted into an analog signal by a DAC, it is filtered by a low-pass filter and then mixed with the local oscillator signal (F_C = 76.5 GHz) in an IQ mixer. After that, it enters a parallel RF phase shifter unit. The RF phase shifter unit contains N phase shifters and a power amplifier (PA). Each phase shifter corresponds to a Tx channel and a transmit antenna. The RF signal, after being phase-shifted by different phase shifters, is radiated from the transmit antenna.

[0363] Through the embodiments of the present application, the generated baseband signal is multiplexed for different transmission signals. The mixing and phase shifting unit performs mixing and phase shifting operations on the baseband signal and the local oscillator signal to generate a radio frequency signal. The radio frequency signal has a different phase change pattern in each transmission channel, thereby achieving orthogonality between the transmission signals. Moreover, compared with the signal processing system shown in FIG4 above, the signal processing system does not require feedback adjustment of analog devices such as phase-locked loops during the generation of the N radio frequency signals, which can achieve better linearity and shorter stabilization time, thereby solving the problems of poor linearity and long stabilization time in current analog modulation radars. Moreover, compared with the signal processing system shown in FIG5 above, in order to realize the transmission of different signals by multiple transmission channels, the signal processing system does not need to set up an independent DAC group in each channel, thereby reducing hardware complexity, reducing power consumption and saving costs.

[0364] Please refer to Figure 19, which is a signal schematic diagram provided in an embodiment of the present application.

[0365] It can be understood that the signal schematic diagram shown in Figure 19 can be the signal corresponding to the signal processing system shown in Figure 18 above, or the signal schematic diagram shown in Figure 19 can also be understood as the signal corresponding to the signal processing system that first performs mixing processing and then performs phase shifting processing, including but not limited to the signal corresponding to the signal processing system shown in Figure 10 or Figure 11 above.

[0366] As shown in Figure 19, the signal processing system's signal generation unit generates a baseband FMCW signal. This baseband FMCW signal is mixed with a local oscillator signal to produce a radio frequency FMCW signal. After the radio frequency FMCW signal enters different Tx channels, the phase shifter performs phase shifting according to different phase shifting rules to distinguish the transmit signals of different Tx channels. The phase shifting rule can be a specific phase difference between adjacent linear frequency modulations (chirps), such as 90°, to achieve phase rotation and frequency shifting, modulating the FMCW signal to different Doppler frequencies.

[0367] Please refer to Figure 20, which is a signal schematic diagram provided in an embodiment of the present application.

[0368] It can be understood that the signal schematic diagram shown in Figure 20 can be the signal corresponding to the signal processing system shown in Figure 18 above, or the signal schematic diagram shown in Figure 20 can also be understood as the signal corresponding to the signal processing system that first performs mixing processing and then performs phase shifting processing, including but not limited to the signal corresponding to the signal processing system shown in Figure 10 or Figure 11 above.

[0369] As shown in Figure 20, the signal processing system's signal generation unit generates a baseband PMCW signal. This baseband FMCW signal is mixed with a local oscillator signal to produce a radio frequency PMCW signal. After the radio frequency PMCW signal enters different Tx channels, the phase shifter performs phase shifting according to different phase shifting rules to distinguish the transmit signals from different Tx channels. The phase shifting rule can be a fixed phase difference between adjacent sequences S, such as 90°, to achieve phase rotation and frequency shifting, modulating the PMCW signal to different Doppler frequencies.

[0370] Please refer to Figure 21, which is a structural diagram of another signal processing system provided in an embodiment of the present application.

[0371] It can be understood that the signal processing system shown in FIG21 can be implemented as a separate embodiment, or the signal processing system shown in FIG21 can also be understood as a variation or supplement of the signal processing systems in FIG6 to FIG9 above.

[0372] As shown in Figure 21, it includes N transmit (Tx) channels. The digital mode of the transmit signal is stored in the random access memory (RAM). After being converted into an analog signal by the DAC, it is filtered by a low-pass filter and then enters the parallel RF phase shifter unit. The RF phase shifter unit includes N phase shifters, each corresponding to an analog signal. The analog signal after phase shifting by different phase shifters is mixed with the local oscillator signal (F_C = 76.5 GHz) in the IQ mixer and then radiated from the transmit antenna through the power amplifier (PA).

[0373] Through the embodiments of the present application, the generated baseband signal is multiplexed for different transmission signals. The mixing and phase shifting unit performs mixing and phase shifting operations on the baseband signal and the local oscillator signal to generate a radio frequency signal. The radio frequency signal has a different phase change pattern in each transmission channel, thereby achieving orthogonality between the transmission signals. Moreover, compared with the signal processing system shown in FIG4 above, the signal processing system does not require feedback adjustment of analog devices such as phase-locked loops during the generation of the N radio frequency signals, which can achieve better linearity and shorter stabilization time, thereby solving the problems of poor linearity and long stabilization time in current analog modulation radars. Moreover, compared with the signal processing system shown in FIG5 above, in order to realize the transmission of different signals by multiple transmission channels, the signal processing system does not need to set up an independent DAC group in each channel, thereby reducing hardware complexity, reducing power consumption and saving costs.

[0374] The present application provides a chip, which includes the signal processing system provided by the present application.

[0375] This application provides a radar or radar system that includes the signal processing system or the aforementioned chip provided herein. It should be noted that there may be smart sensors that integrate multiple sensors. If the smart sensor includes millimeter-wave detection capabilities, the smart sensor may also be referred to as a millimeter-wave radar or millimeter-wave radar system.

[0376] This application provides a terminal device that includes the signal processing system provided herein. For example, the terminal device can be a transportation vehicle, such as a car, truck, aircraft, drone, slow-moving transport vehicle, spacecraft, or ship, used in any possible scenario. It can also be any device capable of carrying a laser detection device, such as surveying and mapping equipment. One or more signal processing systems provided herein are deployed on the terminal device.

[0377] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A signal processing system, characterized in that: include: Signal generation unit, frequency mixing and phase shifting unit, N transmitting ports; among which: The signal generating unit is configured to generate a baseband signal, wherein the baseband signal includes a first baseband signal and a second baseband signal, and the first baseband signal and the second baseband signal are orthogonal signals; The mixing and phase shifting unit is configured to perform mixing and phase shifting on the baseband signal to obtain N radio frequency signals, wherein the phases or frequencies of the N radio frequency signals are different from each other; The N transmitting ports are used to transmit the N radio frequency signals respectively; wherein N is a positive integer.

2. The signal processing system according to claim 1, wherein The N radio frequency signals are frequency modulated continuous wave signals FMCW, and the N radio frequency signals satisfy a first pulse repetition interval PRI; or, The N radio frequency signals are phase modulated continuous wave signals PMCW, and the N radio frequency signals meet a second pulse repetition interval PRI.

3. The signal processing system according to claim 1 or 2, characterized in that The first baseband signal is an in-phase signal, and the second baseband signal is a quadrature signal.

4. The signal processing system according to any one of claims 1 to 3, characterized in that The frequency mixing and phase shifting unit comprises: a first frequency mixing unit, a first phase shifting unit; The first frequency mixing unit is configured to perform frequency mixing on the baseband signal to obtain a first mixed signal; The first phase shift unit is configured to perform phase shift processing on the first mixed signal to obtain the N radio frequency signals.

5. The signal processing system according to claim 4, characterized in that The first frequency mixing unit includes a first frequency mixing module, and the first frequency mixing module includes: a first mixer, a second mixer; The first mixer is configured to perform mixing processing on the first baseband signal and the first local oscillator signal; The second mixer is configured to perform mixing processing on the second baseband signal and the first local oscillator signal.

6. The signal processing system according to claim 4 or 5, characterized in that The first phase shifting unit includes: N phase shifters; The N phase shifters are used to perform phase shift processing on the N sub-mixing signals corresponding to the first mixing signal to obtain the N radio frequency signals.

7. The signal processing system according to any one of claims 1 to 3, characterized in that The frequency mixing and phase shifting unit comprises: a second phase shifting unit, a second frequency mixing unit; The second phase shift unit is configured to perform phase shift processing on the first local oscillator signal to obtain N phase-shifted signals; The second mixing unit is configured to perform mixing processing on the N sub-baseband signals corresponding to the one baseband signal and the N phase-shifted signals respectively to obtain the N radio frequency signals.

8. The signal processing system according to claim 7, wherein: The second phase shifting unit includes: N phase shifters; The N phase shifters are used to perform phase shift processing on the N sub-local oscillator signals corresponding to the first local oscillator signal to obtain the N phase-shifted signals.

9. The signal processing system according to claim 7 or 8, characterized in that The second frequency mixing unit includes N frequency mixing modules, and the second frequency mixing module among the N frequency mixing modules includes: a third mixer, a fourth mixer; The third mixer is configured to perform mixing processing on a first sub-baseband signal corresponding to the first baseband signal and a first phase-shifted signal among the N phase-shifted signals; The fourth mixer is configured to perform mixing processing on a second sub-baseband signal corresponding to the second baseband signal and the first phase-shifted signal.

10. The signal processing system according to any one of claims 1 to 3, characterized in that: The frequency mixing and phase shifting unit comprises: a third phase shifting unit, a third frequency mixing unit; The third phase shifting unit is configured to perform phase shift processing on the first baseband signal to obtain N first phase-shifted signals, and perform phase shift processing on the second baseband signal to obtain N second phase-shifted signals; The third frequency mixing unit is configured to perform frequency mixing processing on the N first phase-shifted signals and the N second phase-shifted signals respectively to obtain the N radio frequency signals.

11. The signal processing system according to claim 10, wherein: The third phase shifting unit includes: 2N phase shifters; The 2i-1th phase shifter among the 2N phase shifters is configured to perform phase shift processing on the N sub-baseband signals corresponding to the first baseband signal to obtain the N first phase-shifted signals; The 2i-th phase shifter among the 2N phase shifters is configured to perform phase shift processing on the N sub-baseband signals corresponding to the second baseband signal to obtain the N second phase-shifted signals; Wherein, the i is a positive integer less than or equal to the N.

12. The signal processing system according to claim 10 or 11, characterized in that The third frequency mixing unit includes N frequency mixing modules, and the third frequency mixing module among the N frequency mixing modules includes: a fifth mixer, a sixth mixer; The fifth mixer is configured to perform mixing processing on the first local oscillator signal and one of the N first phase-shifted signals; The sixth mixer is configured to perform mixing processing on the first local oscillator signal and one of the N second phase-shifted signals.

13. The signal processing system according to any one of claims 1 to 3, characterized in that The frequency mixing and phase shifting unit comprises: a fourth mixing unit, a fifth mixing unit; The fourth frequency mixing unit is configured to perform frequency mixing processing on each of the N second local oscillator signals, the orthogonal signal corresponding to each of the second local oscillator signals, and the N baseband signals corresponding to the first baseband signal, respectively, to obtain N first mixed signals; and to perform frequency mixing processing on each of the N second local oscillator signals, the orthogonal signal corresponding to each of the second local oscillator signals, and the N baseband signals corresponding to the second baseband signal, respectively, to obtain N second mixed signals; The fifth frequency mixing unit is configured to perform frequency mixing processing on the N first frequency mixing signals and the N second frequency mixing signals respectively to obtain the N radio frequency signals.

14. The signal processing system according to claim 13, wherein: The frequencies of the N second local oscillation signals are different from each other.

15. The signal processing system according to claim 13 or 14, characterized in that The fourth frequency mixing unit includes 2N frequency mixing modules, and the fourth frequency mixing module among the 2N frequency mixing modules includes: a seventh mixer, an eighth mixer; The seventh mixer is configured to perform mixing processing on one second local oscillator signal among the N second local oscillator signals and a first sub-baseband signal corresponding to the first baseband signal; The eighth mixer is configured to perform mixing processing on the quadrature signal corresponding to the second local oscillator signal and the first sub-baseband signal corresponding to the first baseband signal; The fifth mixing module among the 2N mixing modules includes: ninth mixer, tenth mixer; The ninth mixer is configured to perform mixing processing on one second local oscillator signal among the N second local oscillator signals and a second sub-baseband signal corresponding to the second baseband signal; The tenth mixer is configured to perform mixing processing on the orthogonal signal corresponding to the second local oscillator signal and the second sub-baseband signal corresponding to the second baseband signal.

16. The signal processing system according to any one of claims 13 to 15, characterized in that: The fifth frequency mixing unit includes N frequency mixing modules, and the sixth frequency mixing module among the N frequency mixing modules includes: an eleventh mixer, a twelfth mixer; The eleventh mixer is configured to perform mixing processing on the first local oscillator signal and one of the N first mixed signals; The twelfth mixer is configured to perform mixing processing on the first local oscillator signal and one second mixed signal among the N second mixed signals.

17. The signal processing system according to any one of claims 1 to 16, characterized in that: The signal generating unit includes: a first digital-to-analog converter, a second digital-to-analog converter; The first digital-to-analog converter is configured to perform digital-to-analog conversion on the input first digital signal to obtain the first baseband signal; The second digital-to-analog converter is configured to perform digital-to-analog conversion on the input second digital signal to obtain the second baseband signal.

18. The signal processing system according to any one of claims 1 to 16, characterized in that The signal generating unit includes: a first phase shifter, a second phase shifter; The first phase shifter is configured to perform phase shift processing on the input first digital signal and the third local oscillator signal to obtain the first baseband signal; The second phase shifter is used to perform phase shift processing on the input second digital signal and the third local oscillator signal to obtain the second baseband signal.

19. A chip, characterized in that: The chip includes the signal processing system according to any one of claims 1 to 18.

20. A radar, characterized in that: The radar includes the signal processing system according to any one of claims 1 to 18, or the chip according to claim 19.

21. A terminal device, characterized in that: The terminal device includes the signal processing system according to any one of claims 1 to 18, or the chip according to claim 19, or the radar according to claim 20.

22. A vehicle end, characterized in that: The vehicle end includes the signal processing system according to any one of claims 1 to 18, or the chip according to claim 19, or the radar according to claim 20, or the terminal device according to claim 21.

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