Signal processing device, method and system

Abstract

The present application provides a signal processing device, which includes a first signal receiving circuit, a second signal receiving circuit and a first signal generating circuit; wherein the first signal generating circuit is used to generate a first reference signal; the first signal receiving circuit is used to receive a first radio frequency signal, and processes the first radio frequency signal according to the first reference signal to obtain a first signal; the second signal receiving circuit is used to receive a second radio frequency signal, and processes the second radio frequency signal according to the first reference signal to obtain a second signal. The first radio frequency signal and the second radio frequency signal are radio frequency signals from the same global navigation satellite system, and the frequencies of the first signal and the second signal are both within a preset frequency band. Compared with conventional technologies, the device provided in the embodiment of the present application can utilize two signal receiving circuits to process radio frequency signals from the same GNSS system, which can improve positioning accuracy and meet the needs of high-precision applications.

Description

Technical Field

[0001] The present application relates to the field of signal processing technology, and in particular to a signal processing device, method and system. Background Art

[0002] With the development of technology, global navigation satellite systems (GNSS) such as the Global Positioning System (GPS) and the BeiDou Navigation Satellite System (BDS) have been widely used. Terminal devices with GNSS receiving chips can receive radio frequency signals sent by satellites through the GNSS receiving chips to determine the location of the terminal devices.

[0003] In order to process the RF signal, the GNSS receiving chip can generate a reference signal and process the RF signal based on the reference signal. Considering that the RF signals used by different GNSS systems may belong to different frequency bands, the current GNSS receiving chip can generate reference signals of different frequency bands through a phase-locked loop circuit for processing RF signals of different frequency bands. In addition, the GNSS receiving chip can also include multiple channels, and different channels can process RF signals from different GNSS systems. The location of the terminal can be determined by combining the positioning results of multiple GNSS systems, which can improve the positioning accuracy to a certain extent.

[0004] However, existing multi-channel GNSS receiving chips can only use different channels to process RF signals from different GNSS systems, but cannot use different channels to process RF signals from the same GNSS system. Their positioning accuracy still cannot meet high-precision application scenarios such as attitude determination. Summary of the invention

[0005] In view of this, an embodiment of the present application provides a signal processing device and method, which aims to process satellite signals from the same GNSS system through multiple channels to further improve positioning accuracy.

[0006] To solve the above problems, the technical solutions provided in the embodiments of the present application are as follows:

[0007] A signal processing device, the device comprising a first signal receiving circuit, a second signal receiving circuit and a first signal generating circuit;

[0008] The first signal generating circuit is used to generate a first reference signal;

[0009] The first signal receiving circuit is used to receive a first radio frequency signal, and process the first radio frequency signal according to the first reference signal to obtain a first signal;

[0010] The second signal receiving circuit is used to receive a second radio frequency signal and process the second radio frequency signal according to the first reference signal to obtain a second signal;

[0011] The first radio frequency signal and the second radio frequency signal are radio frequency signals from the same global navigation satellite system, and the frequencies of the first signal and the second signal are both within a preset frequency band.

[0012] Optionally, the device further comprises a switching circuit;

[0013] The first end of the switch circuit is connected to the output end of the first signal generating circuit, and the second end of the switch circuit is connected to the input end of the second signal receiving circuit;

[0014] When the switch circuit is turned on, the first signal generating circuit provides the first reference signal to the second signal receiving circuit.

[0015] Optionally, the switch circuit includes a first sub-switch circuit and a second sub-switch circuit, the first reference signal includes a first sub-reference signal and a second sub-reference signal, and the first sub-reference signal and the second sub-reference signal are differential signals;

[0016] A first end of the first sub-switch circuit is connected to a first output end of the first signal generating circuit, and a second end of the first sub-switch circuit is connected to a first input end of the second signal receiving circuit;

[0017] A first end of the second sub-switch circuit is connected to a second output end of the first signal generating circuit, and a second end of the second sub-switch circuit is connected to a second input end of the second signal receiving circuit;

[0018] When the first sub-switch circuit is turned on, the first signal generating circuit provides the first sub-reference signal to the second signal receiving circuit;

[0019] When the second sub-switch circuit is turned on, the first signal generating circuit provides the second sub-reference signal to the second signal receiving circuit.

[0020] Optionally, the first signal receiving circuit includes a first mixer and a first filter, and the second signal receiving circuit includes a second mixer and a second filter;

[0021] The input end of the first mixer is connected to the output end of the first signal generating circuit, and is used to mix the first RF signal according to the first reference signal to obtain a first mixed signal;

[0022] The first filter is used to filter the first mixed signal to obtain the first signal;

[0023] The input end of the second mixer is connected to the output end of the first signal generating circuit, and is used to mix the second RF signal according to the first reference signal to obtain a second mixed signal;

[0024] The second filter is used to filter the second mixed signal to obtain the second signal.

[0025] Optionally, the device further comprises a second signal generating circuit and a first control circuit;

[0026] The second signal generating circuit is used to generate a second reference signal and provide the second reference signal to the second signal receiving circuit;

[0027] The first control circuit is used to respond to the same frequency configuration instruction, turn off the second signal generating circuit and turn on the switch circuit, so that the first signal generating circuit provides the first reference signal for the second signal receiving circuit.

[0028] Optionally, the first control circuit is further used for:

[0029] In response to the different frequency configuration instruction, the second signal generating circuit is turned on and the switch circuit is turned off, so that the second signal generating circuit provides a second reference signal for the second signal receiving circuit.

[0030] Optionally, the device further comprises a second signal generating circuit and a second control circuit;

[0031] The first signal generating circuit is configured to generate a first reference signal according to a first generating parameter, wherein the first generating parameter includes a first frequency band, and a frequency of the first reference signal is within the first frequency band;

[0032] The second signal generating circuit is configured to generate a second reference signal according to a second generating parameter, wherein the second generating parameter includes a second frequency band, and the frequency of the second reference signal is within the second frequency band;

[0033] The second control circuit is used to determine whether the first frequency band matches the second frequency band; if the first frequency band matches the second frequency band, the second signal generating circuit is turned off and the switch circuit is turned on so that the first signal generating circuit provides a first reference signal for the second signal receiving circuit.

[0034] Optionally, the second control circuit is further used for:

[0035] If the first frequency band does not match the second frequency band, the second signal generating circuit is turned on and the switch circuit is turned off, so that the second signal generating circuit provides a second reference signal for the second signal receiving circuit.

[0036] A signal processing method, the method being applied to a signal processing device;

[0037] The method comprises:

[0038] generating a first reference signal;

[0039] receiving a first radio frequency signal, and processing the first radio frequency signal according to the first reference signal to obtain a first signal;

[0040] receiving a second radio frequency signal, and processing the second radio frequency signal according to the first reference signal to obtain a second signal;

[0041] The first radio frequency signal and the second radio frequency signal are radio frequency signals from the same global navigation satellite system, and the frequencies of the first signal and the second signal are both within a preset frequency band.

[0042] Optionally, the device comprises a first signal generating circuit, a first signal receiving circuit, a second signal receiving circuit and a switch circuit; a first end of the switch circuit is connected to an output end of the first signal generating circuit, and a second end of the switch circuit is connected to an input end of the second signal receiving circuit;

[0043] Generating the first reference signal comprises:

[0044] controlling the first signal generating circuit to generate a first reference signal;

[0045] The receiving a first radio frequency signal, and processing the first radio frequency signal according to the first reference signal to obtain a first signal includes:

[0046] Controlling the first signal receiving circuit to receive a first radio frequency signal, and processing the first radio frequency signal according to the first reference signal to obtain a first signal;

[0047] The receiving a second radio frequency signal, and processing the second radio frequency signal according to the first reference signal to obtain a second signal includes:

[0048] Controlling the second signal receiving circuit to receive a second radio frequency signal, and processing the second radio frequency signal according to the first reference signal to obtain a second signal;

[0049] Before controlling the second signal receiving circuit to process the second radio frequency signal according to the first reference signal, the method further includes:

[0050] The switch circuit is controlled to be turned on so that the first signal generating circuit provides the first reference signal to the second signal receiving circuit.

[0051] Optionally, the switch circuit includes a first sub-switch circuit and a second sub-switch circuit, the first reference signal includes a first sub-reference signal and a second sub-reference signal, and the first sub-reference signal and the second sub-reference signal are differential signals;

[0052] A first end of the first sub-switch circuit is connected to a first output end of the first signal generating circuit, and a second end of the first sub-switch circuit is connected to a first input end of the second signal receiving circuit;

[0053] A first end of the second sub-switch circuit is connected to a second output end of the first signal generating circuit, and a second end of the second sub-switch circuit is connected to a second input end of the second signal receiving circuit;

[0054] The controlling the switch circuit to be turned on comprises:

[0055] Turning on the first switch sub-circuit so that the first signal generating circuit provides the first sub-reference signal to the second signal receiving circuit;

[0056] The second sub-switch circuit is turned on so that the first signal generating circuit provides the second sub-reference signal to the second signal receiving circuit.

[0057] Optionally, the processing the first radio frequency signal according to the first reference signal to obtain the first signal includes:

[0058] Mixing the first radio frequency signal according to a first reference signal to obtain a first mixed signal;

[0059] filtering the first mixed signal to obtain the first signal;

[0060] The processing of the second radio frequency signal according to the first reference signal to obtain the second signal includes:

[0061] Mixing the second radio frequency signal according to the first reference signal to obtain a second mixed signal;

[0062] The second mixed signal is filtered to obtain the second signal.

[0063] Optionally, the device further comprises a second signal generating circuit;

[0064] The method further comprises:

[0065] Controlling the second signal generating circuit to generate a second reference signal, and providing the second reference signal to the second signal receiving circuit;

[0066] In response to the same frequency configuration instruction, the second signal generating circuit is turned off and the switch circuit is turned on, so that the first signal generating circuit provides the first reference signal to the second signal receiving circuit.

[0067] Optionally, the method further comprises:

[0068] In response to the different-frequency configuration instruction, control the first signal receiving circuit to receive a first radio frequency signal, and control the second signal receiving circuit to receive a second radio frequency signal; turn on the second signal generating circuit and turn off the switch circuit, so that the second signal generating circuit provides a second reference signal for the second signal receiving circuit, and the first radio frequency signal and the second radio frequency signal are radio frequency signals from different frequency bands of the same global navigation satellite system; or

[0069] Control the first signal receiving circuit to receive a first radio frequency signal, and control the second signal receiving circuit to receive a third radio frequency signal; turn on the second signal generating circuit and disconnect the switch circuit so that the second signal generating circuit provides a second reference signal for the second signal receiving circuit, and the first radio frequency signal and the third radio frequency signal are radio frequency signals from different frequency bands of different global navigation satellite systems.

[0070] Optionally, controlling the first signal generating circuit to generate a first reference signal includes:

[0071] Controlling the first signal receiving circuit to generate a first reference signal according to a first generation parameter, where the first generation parameter includes a first frequency band, and a frequency of the first reference signal is within the first frequency band;

[0072] The method further comprises:

[0073] Controlling the second signal generating circuit to generate a second reference signal according to a second generating parameter, wherein the second generating parameter includes a second frequency band, and the frequency of the second reference signal is within the second frequency band;

[0074] Determining whether the first frequency band matches the second frequency band;

[0075] If the first frequency band matches the second frequency band, the second signal generating circuit is turned off and the switch circuit is turned on, so that the first signal generating circuit provides a first reference signal for the second signal receiving circuit.

[0076] Optionally, the method further comprises:

[0077] If the first frequency band does not match the second frequency band, control the first signal receiving circuit to receive a first radio frequency signal, and control the second signal receiving circuit to receive a second radio frequency signal; turn on the second signal generating circuit and disconnect the switch circuit so that the second signal generating circuit provides a second reference signal for the second signal receiving circuit, and the first radio frequency signal and the second radio frequency signal are radio frequency signals from different frequency bands of the same global navigation satellite system; or,

[0078] Control the first signal receiving circuit to receive a first radio frequency signal, and control the second signal receiving circuit to receive a third radio frequency signal; turn on the second signal generating circuit and disconnect the switch circuit so that the second signal generating circuit provides a second reference signal for the second signal receiving circuit, and the first radio frequency signal and the third radio frequency signal are radio frequency signals from different frequency bands of different global navigation satellite systems.

[0079] A signal processing system, the system comprising a first signal receiving antenna, a second signal receiving antenna and a signal processing device;

[0080] The first signal receiving antenna is connected to the first signal receiving circuit of the signal processing device, and is used to receive a first radio frequency signal and send the first radio frequency signal to the first signal receiving circuit;

[0081] The second signal receiving antenna is connected to the second signal receiving circuit of the signal processing device, and is used to receive a second radio frequency signal or a third radio frequency signal, and send the second radio frequency signal or the third radio frequency signal to the first signal receiving circuit; the first radio frequency signal and the second radio frequency signal are radio frequency signals from the same frequency band of the same global navigation satellite system; the first radio frequency signal and the third radio frequency signal are radio frequency signals from different global navigation satellite systems;

[0082] The signal processing device includes any one of the signal processing devices described above, and is used to obtain a first signal based on the first radio frequency signal, obtain a second signal or a third signal based on the second radio frequency signal or the third radio frequency signal, and send the first signal and the second signal or the third signal to the baseband chip, so as to determine the position of the signal processing system based on the first signal and the second signal or the third signal.

[0083] A signal processing system, the system comprising a third signal receiving antenna and a signal processing device;

[0084] The third signal receiving antenna is connected to the first signal receiving circuit and the second signal receiving circuit of the signal processing device, and is used to receive a first radio frequency signal and a second radio frequency signal, and send the first radio frequency signal to the first signal receiving circuit, and send the second radio frequency signal to the second signal receiving circuit; or, receive a first radio frequency signal and a third radio frequency signal, and send the first radio frequency signal to the first signal receiving circuit, and send the third radio frequency signal to the second signal receiving circuit; the first radio frequency signal and the second radio frequency signal are radio frequency signals from the same frequency band of the same global navigation satellite system; the first radio frequency signal and the third radio frequency signal are radio frequency signals from different global navigation satellite systems;

[0085] The signal processing device includes any one of the signal processing devices described above, and is used to obtain a first signal based on the first radio frequency signal, obtain a second signal or a third signal based on the second radio frequency signal or the third radio frequency signal, and send the first signal and the second signal or the third signal to the baseband chip, so as to determine the position of the signal processing system based on the first signal and the second signal or the third signal.

[0086] It can be seen that the embodiments of the present application have the following beneficial effects:

[0087] The embodiment of the present application provides a signal processing device, which includes a first signal receiving circuit, a second signal receiving circuit and a first signal generating circuit; wherein the first signal generating circuit is used to generate a first reference signal; the first signal receiving circuit is used to receive a first radio frequency signal, and process the first radio frequency signal according to the first reference signal to obtain a first signal; the second signal receiving circuit is used to receive a second radio frequency signal, and process the second radio frequency signal according to the first reference signal to obtain a second signal. The first radio frequency signal and the second radio frequency signal are radio frequency signals from the same global navigation satellite system, and the frequencies of the first signal and the second signal are both within a preset frequency band. In this way, the first signal generating circuit is used to provide the same first reference signal to the first signal receiving circuit and the second signal receiving circuit, so that the first signal receiving circuit and the second signal receiving circuit can use the same reference signal to process the first radio frequency signal and the second radio frequency signal. Since the obtained first signal and the second signal are also signals of the same frequency band, it means that the first signal and the second signal come from radio frequency signals of the same frequency band. In this way, compared with the traditional technology, the device provided in the embodiment of the present application can use two signal receiving circuits to process radio frequency signals from the same GNSS system, and the two signals are used as positioning references for each other, thereby reducing positioning errors, improving positioning accuracy, and meeting the needs of high-precision applications. In addition, the embodiments of the present application also provide corresponding signal processing methods and devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0088] Figure 1 A schematic diagram of the structure of a traditional multi-channel GNSS receiving chip provided in an embodiment of the present application;

[0089] Figure 2 A schematic diagram of an exemplary application scenario of the signal processing device provided in an embodiment of the present application;

[0090] Figure 3 A schematic diagram of a structure of a signal processing device provided in an embodiment of the present application;

[0091] Figure 4 A schematic diagram of another structure of a signal processing device provided in an embodiment of the present application;

[0092] Figure 5 A schematic diagram of another structure of a signal processing device provided in an embodiment of the present application;

[0093] Figure 6 Another structural diagram of a signal processing device provided in an embodiment of the present application

[0094] Figure 7 Another structural diagram of a signal processing device provided in an embodiment of the present application

[0095] Figure 8 A schematic diagram of another structure of a signal processing device provided in an embodiment of the present application;

[0096] Fig. 9 A method flow chart of a signal processing method provided in an embodiment of the present application;

[0097] Fig.10 A schematic diagram of a structure of a signal processing system provided in an embodiment of the present application;

[0098] Fig.11 A schematic diagram of the structure of a signal processing system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0099] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the embodiments of the present application are further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0100] In order to facilitate the understanding and explanation of the technical solution provided by the embodiments of the present application, the structure of a traditional multi-channel Global Navigation Satellite System (GNSS) receiving chip is first described below in conjunction with the drawings in the specification.

[0101] See also Figure 1 ,This figure is a schematic diagram of the structure of a traditional multi-channel GNSS receiving chip.

[0102] like Figure 1 As shown, a traditional multi-channel GNSS receiving chip may include two receiving channels, channel CH1 and channel CH2. Each channel may include components such as an amplifier, a phase-locked loop, a mixer, a filter, a programmable amplifier, and a mode converter. Different channels are independent of each other and can be used to receive RF signals of different frequency bands. Taking channel CH1 as an example, the receiving antenna corresponding to channel CH1 can receive RF signals and convert the RF signals into two differential signals, which are input into channel CH1 through CH1_RFIN and CH1_RFIP respectively. Since the frequency bands of RF signals used by different GNSS systems are different, in order to increase the applicability of the GNSS receiving chip, the receiving antenna can receive RF signals from different GNSS systems. For example, the RF signal from the Global Positioning System (GPS) can be in the frequency band of 1176.45±1.023MHz, and the RF signal from the BeiDou Navigation Satellite System (BDS) can be in the frequency band of 1561.098±2.0461MHz. In order to be compatible with both GPS and BDS GNSS systems, the receiving antenna can receive RF signals within the range of 1164.45MHz-1559.0519MHz and convert these RF signals into differential signals and input them into channel CH1.

[0103] Take the signal of channel CH1 input through CH1_RFIN (hereinafter referred to as CH1_RFIN signal) as an example for explanation. After amplification by amplifier LNA1, the CH1_RFIN signal is input to mixer MIX1. Phase-locked loop PLL1 can generate a reference signal and process the reference signal into two signals LQ_I1 and LQ_Q1 and input them into mixer MIX1. The two reference signals LQ_I1 and LQ_Q1 are differential signals. PLL1 can determine the frequency of the reference signal according to the RF signal to be processed. For example, if GPS is needed for positioning, it is necessary to process the RF signal in the frequency band of 1176.45±1.023MHz, then PLL1 can generate a reference signal corresponding to the RF signal in the frequency band of 1176.45±1.023MHz, for example, a reference signal with a frequency of 1170MHz can be generated.

[0104] The mixer MIX1 can mix the CH1_RFIN signal according to the reference signal to obtain a mixed signal. For example, the frequency of the CH1_RFIN signal can be subtracted from the frequency of the reference signal, and the result of the subtraction is used as the frequency of the mixed signal. Taking the CH1_RFIN signal including two frequency components of 1176.45±1.023MHz and 1561.098±2.0461MHz, and the frequency of the reference signal is 1170MHz as an example, after the mixing process, the obtained mixed signal includes two frequency components of 6.45±1.023MHz and 391.098±2.0461MHz.

[0105] In order to separate the two components of 6.45±1.023MHz and 391.098±2.0461MHz, MIX1 can input the mixed signal into the low-pass filter LPF1, thereby filtering out the higher frequency component in the mixed signal. Similar to PLL1, the parameters of LPF1 can also be determined according to the RF signal to be processed. For example, LPF1 can set the cutoff frequency to 10MHz, so that the component of 391.098±2.0461MHz in the mixed signal can be filtered out through LPF1, leaving only the component of 6.45±1.023MHz. The filtered mixed signal is amplified by the automatic gain control circuit PGA1_1 and then input into the analog-to-digital conversion circuit ADC1_1 to convert it into a digital signal, and finally output to the baseband chip through Dig_I1 so that the baseband chip can process it.

[0106] Similar to channel CH1, channel CH2 can also preliminarily amplify the RF signal, use PLL2 to generate a reference signal and perform mixing, and finally perform filtering, amplification and analog-to-digital conversion.

[0107] From the previous introduction, we know that the GNSS receiving chip can generate reference signals of different frequencies according to actual needs, so as to use mixers and filters to filter out RF signals of specific frequency bands from the received RF signals. Then, if you need to use different channels to process RF signals from different GNSS systems, that is, use different channels to receive RF signals of different frequency bands, you can control PLL1 and PLL2 to generate reference signals of different frequencies, so as to use channels CH1 and CH2 to receive and process RF signals of different frequency bands respectively.

[0108] Similarly, if it is necessary to use different channels to process the RF signals from the same GNSS system, that is, to use different channels to receive RF signals of the same frequency band, it is necessary to control PLL1 and PLL2 to generate reference signals with the same frequency. However, since the phase-locked loop circuit includes components such as a phase frequency detector, a voltage-controlled oscillator, and a loop filter, among which the voltage-controlled oscillator is sensitive to interference from signals of the same frequency, the entire phase-locked loop circuit is easily interfered by signals with the same or similar frequencies. Therefore, when PLL1 and PLL2 need to output reference signals with the same or similar frequencies, they will interfere with each other and generate frequency pulling, which will cause the frequency of the reference signal to shift, that is, it is impossible to output a reference signal of a specific frequency, thereby affecting the normal operation of the entire GNSS receiving chip.

[0109] Based on this, an embodiment of the present application provides a signal processing device, which includes a first signal receiving circuit, a second signal receiving circuit and a first signal generating circuit; wherein the first signal generating circuit is used to generate a first reference signal; the first signal receiving circuit is used to receive a first radio frequency signal, and process the first radio frequency signal according to the first reference signal to obtain a first signal; the second signal receiving circuit is used to receive a second radio frequency signal, and process the second radio frequency signal according to the first reference signal to obtain a second signal. The first radio frequency signal and the second radio frequency signal are radio frequency signals from the same global navigation satellite system, and the frequencies of the first signal and the second signal are both within a preset frequency band. In this way, the first signal generating circuit is used to provide the first signal receiving circuit and the second signal receiving circuit with the same first reference signal, so that the first signal receiving circuit and the second signal receiving circuit can use the same reference signal to process the first radio frequency signal and the second radio frequency signal. Since the obtained first signal and the second signal are also signals of the same frequency band, it means that the first signal and the second signal come from radio frequency signals of the same frequency band. In this way, compared with the conventional technology, the device provided in the embodiment of the present application can use two signal receiving circuits to process radio frequency signals from the same GNSS system to obtain the first signal and the second signal from the same GNSS system. By using these two signals to refer to each other for positioning, positioning errors can be reduced, thereby improving the positioning accuracy of the global navigation satellite system and meeting the requirements of high-precision applications. In addition, the embodiments of the present application also provide corresponding signal processing methods and devices.

[0110] In order to facilitate understanding of the signal processing device provided in the embodiment of the present application, Figure 2 The application scenario of the signal processing device provided in the embodiment of the present application is described. Figure 2 A schematic diagram of an exemplary application scenario of a signal processing device provided in an embodiment of the present application.

[0111] In practical applications, the signal processing device provided in the embodiment of the present application can be set in the terminal device 203. The terminal device 203 can receive radio frequency signals from the GNSS satellite 201 and the GNSS satellite 202, and determine the position or specific posture of the terminal device 203 through the radio frequency signals.

[0112] The terminal device 203 may be a mobile terminal device such as a smart phone or a laptop, or a vehicle with a positioning function or other device that needs to be positioned using GNSS. The GNSS satellite 201 and the GNSS satellite 202 may belong to the same GNSS system or different GNSS systems.

[0113] Those skilled in the art will understand that Figure 2 The schematic diagram shown is only an example in which the embodiments of the present application can be implemented. The scope of application of the embodiments of the present application is not limited in any aspect by this framework.

[0114] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0115] Embodiment 1:

[0116] Embodiment 1 of the present application provides a signal processing device, which is described in detail below with reference to the accompanying drawings for easy understanding.

[0117] See also Figure 3 , which is a schematic diagram of the structure of a signal processing device provided in an embodiment of the present application, such as Figure 3 As shown, the device may include a first signal generating circuit 310, a first signal receiving circuit 320, and a second signal receiving circuit 330;

[0118] The first signal generating circuit 310 may be used to generate a first reference signal. The first signal receiving circuit 320 may be used to receive a first radio frequency signal, and process the first radio frequency signal according to the first reference signal provided by the first signal generating circuit 310, thereby obtaining a first signal. The second signal receiving circuit 320 may be used to receive a second radio frequency signal, and process the second radio frequency signal according to the first reference signal provided by the first signal generating circuit 320, thereby obtaining a second signal.

[0119] The first radio frequency signal and the second radio frequency signal may be radio frequency signals from the same global navigation satellite system, and the frequencies of the first signal and the second signal are both within a preset frequency band.

[0120] In the embodiment of the present application, the first signal generating circuit 310 may be any circuit capable of generating a first reference signal having a specific frequency, such as a frequency synthesizer, a phase-locked loop circuit, etc. The first signal receiving circuit 320 and the second signal receiving circuit 330 may be any circuit capable of processing the first RF signal or the second RF signal according to the first reference signal, such as a circuit including components for signal processing such as a mixer and a filter. The specific structures of the first signal generating circuit 310, the first signal receiving circuit 320 and the second signal receiving circuit 330 are not further limited in this embodiment.

[0121] Specifically, the frequency of the first reference signal can be adjusted according to actual needs, corresponding to the frequency band to which the radio frequency signal to be used belongs. For example, when it is necessary to use a radio frequency signal of 1561.098±2.0461MHz for positioning, the first signal generating circuit 310 can be controlled to generate a first reference signal with a frequency of 1555MHz. When it is necessary to use a radio frequency signal of 1176.45±1.023MHz for positioning, the first signal generating circuit 310 can be controlled to generate a first reference signal with a frequency of 1170MHz.

[0122] The first RF signal may be a RF signal directly received by the antenna, or a signal obtained after preliminary processing of the RF signal received by the antenna. The first signal may be a digital signal obtained after analog-to-digital conversion, or an analog signal that has not been converted to analog-to-digital. Similarly, the second RF signal may be a RF signal directly received by the receiving antenna, or a signal obtained after preliminary processing of the RF signal received by the receiving antenna. The second signal may be a digital signal obtained after analog-to-digital conversion, or an analog signal that has not been converted to analog-to-digital. This embodiment does not further limit this.

[0123] The following takes the first signal receiving circuit 320 as an example to describe in detail the process of processing the first RF signal.

[0124] In addition to the first RF signal, the signal received by the first signal receiving circuit 320 may be a mixed signal after multiple RF signals are superimposed, for example, it may be a mixed RF signal after the first RF signal and the RF signals from different GNSS systems and the RF signals from communication satellites are superimposed. When the first RF signal is superimposed with other RF signals, the first signal receiving circuit 320 may process the received mixed RF signal as a whole.

[0125] In order to extract the first RF signal from the mixed RF signal, in an embodiment of the present application, the first signal receiving circuit 320 may include a first mixer and a first filter. Among them, the input end of the first mixer is connected to the output end of the first signal generating circuit 310, and is used to mix the mixed RF signal including the first RF signal according to the first reference signal to obtain the first mixed signal. The first filter is used to filter the first mixed signal to obtain the first signal. Specifically, the first mixer can make a difference between the frequency of the first RF signal and the frequency of the first reference signal, and use the result of the difference as the frequency of the first mixed signal. The first filter can be a low-pass filter or a band-pass filter, which is used to filter the frequency components of the first mixed signal that are too high or too low. In this way, through the first mixer and the first filter, the components in the mixed RF signal that are not related to the first RF signal can be filtered out to obtain the first signal.

[0126] In some other implementations, the first signal receiving circuit 320 may further include a programmable gain amplifier, an automatic gain control circuit, an analog-to-digital converter, etc., for further processing the filtered mixed signal.

[0127] For example, the mixed RF signal received by the first signal receiving circuit is obtained by superimposing RF signals of two frequency bands, 1176.45±1.023 MHz and 1561.098±2.0461 MHz, and the first RF signal is a RF signal of the frequency band 1176.45±1.023 MHz.

[0128] When it is necessary to process the RF signal in the frequency band of 1176.45±1.023MHz, the first signal generating circuit 310 can generate a first reference signal of 1170MHz in batches, and provide the first reference signal to the first signal receiving circuit 320. The first signal receiving circuit 320 can use the first mixer to mix the first reference signal and the mixed RF signal having two frequency components of 1176.45±1.023MHz and 1561.098±2.0461MHz, and obtain a first mixed signal having two frequency components of 6.45±1.023MHz and 391.098±2.0461MHz. Then, the first mixed signal is input into the first filter, and the high frequency component of 391.098±2.0461MHz is filtered out, and finally the first signal of 6.45±1.023MHz is obtained, so that the first signal can be further processed later.

[0129] In an embodiment of the present application, the second signal receiving circuit 330 may include a second mixer and a second filter. The input end of the second mixer is connected to the output end of the first signal generating circuit 310, and is used to mix the second RF signal according to the first reference signal to obtain a second mixed signal. The second filter is used to filter the second mixed signal to obtain a second signal. The specific process is similar to that of the first signal receiving circuit 320, and will not be repeated here.

[0130] In this embodiment, the first signal generating circuit 310 can provide a first reference signal for the first signal receiving circuit 320 and the second signal receiving circuit 330. The first signal receiving circuit 320 and the second signal receiving circuit 330 process the received radio frequency signal using the first reference signal to obtain the first signal and the second signal. Since the first signal and the second signal belong to the same frequency band and both are obtained using the reference signal of the same frequency, it can be determined that the first signal and the second signal are derived from the same GNSS system, that is, the first radio frequency signal and the second radio frequency signal are radio frequency signals of the same frequency band. Because different GNSS systems occupy different frequency bands, radio frequency signals of the same frequency band come from the same GNSS system. In this way, it is equivalent to using the first signal receiving circuit 320 and the second signal receiving circuit 330 to process the radio frequency signal of the same GNSS system, which can improve the positioning accuracy and meet the requirements of special application scenarios such as zero-error positioning and attitude determination.

[0131] It should be noted that the signal processing device provided in this embodiment includes two signal receiving circuits, namely, the first signal receiving circuit 320 and the second signal receiving circuit 330, which does not mean that the signal processing device provided in the embodiment of the present application only includes two signal receiving circuits. In some other implementations, a third signal receiving circuit, a fourth signal receiving circuit, and even an Nth signal receiving circuit may also be included. Regardless of how many signal receiving circuits the signal processing device includes, the first signal generating circuit 310 may provide a first reference signal to all or part of the signal receiving circuits so that these signal receiving circuits process the radio frequency signals from the same GNSS system according to the first reference signal.

[0132] Embodiment 2:

[0133] In combination with the circuits described in the above embodiments, the connection relationship between the first signal generating circuit and the second signal receiving circuit is described in detail in Embodiment 2 of the present application. In this embodiment, the signal processing device further includes a switch circuit for connecting the first signal generating circuit and the second signal receiving circuit.

[0134] For ease of understanding, the following Figure 4 , which is introduced in detail.

[0135] See also Figure 4, which is a structural schematic diagram of another signal processing device provided in an embodiment of the present application.

[0136] The switch circuit 340 may be a circuit or component having at least two ports, such as a single-pole single-throw switch or an electronic switch tube. By controlling the switch circuit 340 to be turned on and off, the two circuits respectively connected to the first end and the second end may be turned on or off. In this embodiment, the first end of the switch circuit 340 is connected to the output end of the first signal generating circuit 310, and the second end of the switch circuit is connected to the input end of the second signal receiving circuit 330.

[0137] When the switch circuit 340 is turned on, the first signal generating circuit 310 is connected to the second signal receiving circuit 330, and the first signal generating circuit 310 provides the first reference signal to the second signal receiving circuit 330, so that the second signal receiving circuit 330 processes the second RF signal according to the first reference signal. When the switch circuit 340 is turned off, the connection between the first signal generating circuit 310 and the second signal receiving circuit 330 is disconnected, and the first signal generating circuit 310 does not provide the first reference signal to the second signal receiving circuit 330.

[0138] Considering that the output power of the first signal generating circuit 310 is limited, the power of the first reference signal may be relatively small and cannot meet the requirements of the two signal receiving circuits, the first signal receiving circuit 320 and the second signal receiving circuit 330. To this end, in some possible implementations, the switch circuit 340 may also include an operational amplifier or other components for amplifying signals, which are used to amplify the first reference signal so as to provide the second signal receiving circuit 330 with a first reference signal of sufficient power.

[0139] In order to facilitate the processing of the radio frequency signal from the GNSS system, the received radio frequency signal can be converted into two differential signals for processing, that is, the radio frequency signal is converted into two signals with the same frequency, the same amplitude and a phase difference of 180 degrees for processing. Then, accordingly, in the process of processing the converted radio frequency signal, the first signal generating circuit 310 can convert the first reference signal into two differential signals, which are respectively input into the second signal receiving circuit from two switch circuits.

[0140] For ease of understanding, the following Figure 5 , which is introduced in detail.

[0141] See also Figure 5 , which is a structural schematic diagram of another signal processing device provided in an embodiment of the present application.

[0142] In this embodiment, the switch circuit 340 may include a first sub-switch circuit 341 and a second sub-switch circuit 342, the first signal generating circuit 310 includes a first output terminal A1 and a second output terminal A2, the first signal receiving circuit 320 includes a first input terminal B1 and a second input terminal B2, and the second signal receiving circuit 330 includes a first input terminal C1 and a second input terminal C2.

[0143] The first output terminal A1 of the first signal generating circuit is connected to the first input terminal B1 of the first signal receiving circuit 320 and the first terminal of the first switch sub-circuit 341; the second output terminal A2 of the first signal generating circuit is connected to the second input terminal B2 of the first signal receiving circuit 320 and the first terminal of the second switch sub-circuit 342. The second terminal of the first sub-switch circuit 341 is connected to the first input terminal C1 of the second signal receiving circuit 320. The second terminal of the second sub-switch circuit 342 is connected to the second input terminal C2 of the second signal receiving circuit 320.

[0144] When the first switch sub-circuit 341 and the second switch sub-circuit 342 are both disconnected, the first output terminal A1 of the first signal generating circuit 310 is connected to the first input terminal B1 of the first signal receiving circuit 320, and is disconnected from the first input terminal C1 of the second signal receiving circuit 330; the second output terminal A2 of the first signal generating circuit 310 is connected to the second input terminal B2 of the first signal receiving circuit 320, and is disconnected from the second input terminal C2 of the second signal receiving circuit 330. The first signal generating circuit 310 provides the first sub-reference signal to the first signal receiving circuit 320 through the first output terminal A1, provides the second sub-reference signal to the first signal receiving circuit 320 through the second output terminal A2, and does not provide the reference signal to the second signal receiving circuit 330.

[0145] When the first switch subcircuit 341 and the second switch subcircuit 342 are both turned on, the connection between the first output terminal A1 of the first signal generating circuit 310 and the first input terminal C1 of the second signal receiving circuit 330 is connected; the connection between the second output terminal A2 of the first signal generating circuit 310 and the second input terminal C2 of the second signal receiving circuit 330 is connected. The first signal generating circuit provides the first sub-reference signal to the first signal receiving circuit 320 and the second signal receiving circuit 330 through the first output terminal A1, and provides the second sub-reference signal to the first signal receiving circuit 320 and the second signal receiving circuit 330 through the second output terminal A2. In this way, the first signal receiving circuit 320 and the second signal receiving circuit 330 can both receive two reference signals, and can process the first RF signal and the second RF signal after differentiation.

[0146] In order to process radio frequency signals from different GNSS systems using different channels, in some possible implementations, the signal processing device provided in the embodiment of the present application may further include a second signal generating circuit. In order to switch between the two working modes of "processing radio frequency signals from different GNSS systems using different channels" and "processing radio frequency signals from the same GNSS system using different channels", the signal processing device further includes a first control circuit.

[0147] For ease of understanding, the following Figure 6 , which is introduced in detail.

[0148] See also Figure 6 , which is a structural schematic diagram of another signal processing device provided in an embodiment of the present application.

[0149] In this embodiment, the signal processing device further includes a second signal generating circuit 350 and a first control circuit 360. The output end of the second signal generating circuit 350 is connected to the input end of the second signal receiving circuit 330, and the input end of the second signal generating circuit 350 is connected to the first output end D1 of the first control circuit 360. The second input end D2 of the first control circuit 360 can be connected to the control end E of the switch circuit.

[0150] The first control circuit 360 can receive same-frequency configuration instructions and different-frequency configuration instructions, which correspond to the two working modes of "different channels process RF signals from the same GNSS system" and "different channels process RF signals from different GNSS systems". The same-frequency configuration instructions and different-frequency configuration instructions can be a special code used to indicate the working mode of the signal processing system, which can be generated by the CPU according to actual needs or by other devices. If the signal processing device is required to use different channels to process RF signals from the same GNSS system, the same-frequency configuration instructions can be sent to the signal processing device. If the signal processing device is required to use different channels to process RF signals from different GNSS systems, the different-frequency configuration instructions can be sent to the signal processing device.

[0151] After receiving the inter-frequency configuration instruction, the first control circuit 360 can send an instruction to the second signal generating circuit 350 through the first output terminal D1 to turn on the second signal generating circuit 350, and send an instruction to the switch circuit 340 through the second output terminal D2 to disconnect the connection between the first signal generating circuit 310 and the second signal receiving circuit 330. In this way, the first signal generating circuit 310 generates a first reference signal and provides the first reference signal to the first signal receiving circuit 320; the second signal generating circuit 350 generates a second reference signal and provides the second reference signal to the second signal receiving circuit 330. In this way, the first signal receiving circuit 320 and the second signal receiving circuit 330 process the RF signal using different first reference signals and second reference signals, which is equivalent to using different channels to process RF signals from different GNSS.

[0152] After receiving the same frequency configuration instruction, the first control circuit 360 can send an instruction to the second signal generating circuit 350 through the first output terminal D1 to turn off the second signal generating circuit 350, and send an instruction to the switch circuit 340 through the second output terminal D2 to connect the connection between the first signal generating circuit 310 and the second signal receiving circuit 330. In this way, the first signal generating circuit 310 works, the second signal generating circuit 350 is turned off, and the first signal generating circuit 310 provides the first reference signal to the first signal receiving circuit 320 and the second signal receiving circuit 330. In this way, the first signal receiving circuit 320 and the second signal receiving circuit 330 use the same first reference signal to process the first RF signal and the second RF signal, which is equivalent to using different channels to process the RF signal from the same GNSS.

[0153] In this embodiment, the second signal generating circuit 350 can be turned on or off under the control of the first control circuit 360 to meet the requirements of different working modes. When different channels are required to process RF signals from different GNSS systems, the second signal generating circuit 350 does not work. Then, even if the first signal generating circuit 310 and the second signal generating circuit 350 include components that are sensitive to frequency interference, such as voltage-controlled oscillation circuits, since only the first signal generating circuit 310 is working, the inoperative second signal generating circuit 350 will not interfere with the first signal generating circuit 310. In this way, the first signal generating circuit 310 and the second signal generating circuit 350 will not interfere with each other, and the accuracy of the first reference signal frequency can be ensured.

[0154] In the device provided in the aforementioned embodiment, the signal processing device can determine the working mode in response to the same-frequency configuration instruction and the different-frequency configuration instruction, thereby controlling the second signal generating circuit and the switch circuit through the first control circuit. In some other implementations, the signal processing device can also determine the working mode according to the frequency band to which the first reference signal and the second reference signal belong.

[0155] For ease of understanding, the following Figure 7 , which is introduced in detail.

[0156] See also Figure 7 , which is a structural schematic diagram of another signal processing device provided in an embodiment of the present application.

[0157] In this embodiment, the signal processing device further includes a second signal generating circuit 350 and a second control circuit 370. Figure 7 The second signal generating circuit 350 and Figure 6 The second signal generating circuit 350 in the embodiment may be the same circuit. The output end of the second signal generating circuit 350 is connected to the input end of the second signal receiving circuit 330, and the input end of the second signal generating circuit 350 is connected to the first output end F1 of the second control circuit 370. The second output end F2 of the second control circuit 370 may be connected to the control end E of the switch circuit.

[0158] According to the foregoing discussion, the first signal generating circuit 310 can adjust the frequency of the first reference signal according to actual needs. Similar to the first signal generating circuit 310, the second signal generating circuit 350 can also adjust the frequency of the second reference signal according to actual needs. In this embodiment, the first generation parameter and the second generation parameter can be determined according to actual needs, and the first generation parameter can be sent to the first signal generating circuit 310, and the second generation parameter can be sent to the second signal generating circuit 350. Among them, the first generation parameter can include a first frequency band, and the second generation parameter can include a second frequency band. Then, after receiving the first generation parameter, the first signal generating circuit 310 can generate a first reference signal with a frequency within the first frequency band according to the first generation parameter; after receiving the second generation parameter, the second signal generating circuit 350 can generate a second reference signal with a frequency within the second frequency band according to the second generation parameter.

[0159] If the first frequency band is the same as or similar to the second frequency band, it means that the first signal generating circuit 310 and the second signal generating circuit 350 need to generate the first reference signal and the second reference signal of the same or similar frequency band, that is, the first signal receiving circuit 320 and the second signal receiving circuit 330 need to be used to process the RF signal of the same frequency band. According to the foregoing description, if the reference signal frequencies generated by the first signal generating circuit 310 and the second signal generating circuit 350 are the same, the two may interfere with each other. In this case, in order to avoid mutual interference between the first signal generating circuit 310 and the second signal generating circuit 350, the second control circuit 370 can actively determine whether the first frequency band matches the second frequency band, that is, determine whether the first frequency band is the same or similar to the second frequency band.

[0160] If the first frequency band matches the second frequency band, it means that the first signal receiving circuit 320 and the second signal receiving circuit 330 need to be used to process the RF signal of the same frequency band. Then the first control circuit 370 can send an instruction to the second signal generating circuit 350 through the first output terminal F1 to turn off the second signal generating circuit 350, and send an instruction to the switch circuit 340 through the second output terminal F2 to connect the connection between the first signal generating circuit 310 and the second signal receiving circuit 330. In this way, the first signal generating circuit 310 works, the second signal generating circuit 350 is turned off, and the first signal generating circuit 310 provides the first reference signal to the first signal receiving circuit 320 and the second signal receiving circuit 330. In this way, the first signal receiving circuit 320 and the second signal receiving circuit 330 use the same first reference signal to process the first RF signal and the second RF signal, which is equivalent to using different channels to process the RF signal from the same GNSS.

[0161] If the first frequency band does not match the second frequency band, it means that the first signal receiving circuit 320 and the second signal receiving circuit 330 need to be used to process the RF signals of different frequency bands. Then the first control circuit 370 can send an instruction to the second signal generating circuit 350 through the first output terminal F1 to turn on the second signal generating circuit 350, and send an instruction to the switch circuit 340 through the second output terminal F2 to disconnect the connection between the first signal generating circuit 310 and the second signal receiving circuit 330. In this way, the first signal generating circuit 310 generates a first reference signal and provides the first reference signal to the first signal receiving circuit 320; the second signal generating circuit 350 generates a second reference signal and provides the second reference signal to the second signal receiving circuit 330. In this way, the first signal receiving circuit 320 and the second signal receiving circuit 330 use different first reference signals and second reference signals to process the RF signals, which is equivalent to using different channels to process the RF signals from different GNSS.

[0162] In this embodiment, the second control circuit 370 can actively analyze the first generation parameter and the second generation parameter, determine whether the first signal generation circuit 310 and the second signal generation circuit 350 are working in the same frequency mode by judging whether the first frequency band matches the second frequency band, and then control the second signal generation circuit 350 and the switch circuit 340. In this way, the working state of the signal processing device can be determined according to the actual needs of the terminal device, and the first signal generation circuit 310 and the second signal generation circuit 350 are prevented from interfering with each other, thereby ensuring the accuracy of the first reference signal frequency.

[0163] When the signal processing system includes multiple channels, and the RF signals received by each channel are two differential signals, its structure can be as follows: Figure 8 shown.

[0164] exist Figure 8 The signal processing device shown may include three channels, namely, channel CH1, channel CH2 and channel CH3, wherein the amplifier, mixer, filter, programmable amplifier and mode converter of each channel are independent of each other, and each channel has a phase-locked loop. The two output terminals LO_I2 and LO_Q2 of the phase-locked loop PLL2 are respectively connected to the two input terminals of the mixer MIX1 of the channel CH1 through the RF switch EN1 and the RF switch EN2, and are connected to the two input terminals of the mixer MIX3 of the channel CH3 through the RF switch EN3 and the RF switch EN4.

[0165] If you need to use different channels to process RF signals from different GNSS systems, you can disconnect the four RF switches EN1, EN2, EN3 and EN4, and control PLL1, PLL2 and PLL3 to turn on. In this way, the three channels CH1, CH2 and CH3 are independent of each other and are used to process RF signals from different GNSS systems. If you need to use two channels to process RF signals from the same GNSS system, you can connect EN1 and EN2 and disconnect EN3 and EN4, and control PLL1 to turn off and PLL2 to turn on. In this way, CH1 and CH2 share the reference signal generated by PLL2, and can process RF signals from the same GNSS system. If you need to use three channels to process RF signals from the same GNSS system, you can connect the four RF switches EN1, EN2, EN3 and EN4, and control PLL1 and PLL3 to turn off. In this way, the three channels CH1, CH2 and CH3 share the reference signal generated by PLL2, and can process RF signals from the same GNSS system.

[0166] Embodiment three:

[0167] Embodiment 3 of the present application provides a signal processing method, which is described in detail below with reference to the accompanying drawings.

[0168] See also Fig. 9 , which is a method flow chart of a signal processing method provided in an embodiment of the present application.

[0169] The method is applied to the signal processing device provided in the above-mentioned embodiment 1 or embodiment 2, and the method includes:

[0170] S901: Generate a first reference signal.

[0171] S902: Receive a first radio frequency signal, and process the first radio frequency signal according to the first reference signal to obtain a first signal.

[0172] S903: Receive a second radio frequency signal, and process the second radio frequency signal according to the first reference signal to obtain a second signal.

[0173] The first radio frequency signal and the second radio frequency signal are radio frequency signals from the same global navigation satellite system, and the frequencies of the first signal and the second signal are both within a preset frequency band.

[0174] For detailed implementation of steps S901 - S903 , reference may be made to the description of the above-mentioned embodiment 1 and embodiment 2.

[0175] In the signal processing method provided in the embodiment of the present application, the first reference signal can be used to process the first radio frequency signal and the second radio frequency signal to obtain the first signal and the second signal. Since the first signal and the second signal are signals of the same frequency band, and both are obtained based on the same reference signal, it means that the first signal and the second signal come from radio frequency signals of the same frequency band. In this way, compared with the traditional technology, the method provided in the embodiment of the present application can be used to process radio frequency signals from the same GNSS system, which can improve the positioning accuracy and meet the needs of high-precision applications.

[0176] In some possible implementations, the device includes a first signal generating circuit, a first signal receiving circuit, a second signal receiving circuit and a switching circuit; the first end of the switching circuit is connected to the output end of the first signal generating circuit, and the second end of the switching circuit is connected to the input end of the second signal receiving circuit.

[0177] The step S901 includes: controlling the first signal generating circuit to generate a first reference signal.

[0178] The step S902 includes: controlling the first signal receiving circuit to receive a first radio frequency signal, and processing the first radio frequency signal according to the first reference signal to obtain a first signal.

[0179] The step S903 includes: controlling the second signal receiving circuit to receive a second radio frequency signal, and processing the second radio frequency signal according to the first reference signal to obtain a second signal.

[0180] Before executing step S903, the method further includes:

[0181] The switch circuit is controlled to be turned on so that the first signal generating circuit provides the first reference signal to the second signal receiving circuit.

[0182] In this way, by controlling the on / off of the switch circuit, the connection between the first signal generating circuit and the second signal receiving circuit can be connected or disconnected.

[0183] In some possible implementations, the switch circuit includes a first sub-switch circuit and a second sub-switch circuit, the first reference signal includes a first sub-reference signal and a second sub-reference signal, and the first sub-reference signal and the second sub-reference signal are differential signals of each other; the first end of the first sub-switch circuit is connected to the first output end of the first signal generating circuit, and the second end of the first sub-switch circuit is connected to the first input end of the second signal receiving circuit; the first end of the second sub-switch circuit is connected to the second output end of the first signal generating circuit, and the second end of the second sub-switch circuit is connected to the second input end of the second signal receiving circuit.

[0184] The switching on of the switch circuit further includes: switching on the first switch sub-circuit so that the first signal generating circuit provides the first sub-reference signal to the second signal receiving circuit. Switching on the second sub-switch circuit so that the first signal generating circuit provides the second sub-reference signal to the second signal receiving circuit. In this way, the first signal receiving circuit and the second signal receiving circuit can both receive two reference signals, and can process the first RF signal and the second RF signal after differentiation.

[0185] In some possible implementations, the step S902 specifically includes: mixing the first RF signal according to the first reference signal to obtain a first mixed signal; filtering the first mixed signal to obtain the first signal. In this way, by mixing and filtering the first RF signal and other received RF signals, components unrelated to the first RF signal can be filtered out to obtain the first signal.

[0186] Step S903 specifically includes: mixing the second RF signal according to the first reference signal to obtain a second mixed signal; filtering the second mixed signal to obtain the second signal. In this way, by mixing and filtering the second RF signal and other received RF signals, components irrelevant to the second RF signal can be filtered out to obtain the second signal.

[0187] In some possible implementations, the device further includes a second signal generating circuit;

[0188] The method also includes: controlling the second signal generating circuit to generate a second reference signal and providing the second reference signal to the second signal receiving circuit; in response to a same-frequency configuration instruction, turning off the second signal generating circuit and turning on the switch circuit so that the first signal generating circuit provides the first reference signal to the second signal receiving circuit.

[0189] When different channels are required to process RF signals from the same GNSS system and belonging to the same frequency band, the second signal generating circuit does not work. Then, even if the first signal generating circuit and the second signal generating circuit include components that are sensitive to frequency interference, such as a voltage-controlled oscillator circuit, since only the first signal generating circuit works, the inoperative second signal generating circuit will not interfere with the first signal generating circuit. In this way, the first signal generating circuit and the second signal generating circuit will not interfere with each other, and the accuracy of the first reference signal frequency can be ensured.

[0190] In some possible implementations, the method further includes:

[0191] In response to the different frequency configuration instruction, the second signal generating circuit is turned on and the switch circuit is turned off, so that the second signal generating circuit provides a second reference signal for the second signal receiving circuit.

[0192] If an inter-frequency configuration instruction is received, it means that the first signal receiving circuit and the second signal receiving circuit are required to process the RF signals from different GNSS systems or different frequency bands. Then the RF signal from the same GNSS system but different frequency bands received by the second signal receiving circuit can be called a second RF signal, and the RF signal from a different GNSS system received by the second signal receiving circuit can be called a third RF signal. That is to say, after receiving the inter-frequency configuration instruction, the second signal receiving circuit can receive a second RF signal or a third RF signal that belongs to a different frequency band than the first RF signal.

[0193] The first signal receiving circuit can process the first RF signal according to the first reference signal, and the second signal receiving circuit can process the second RF signal or the third RF signal according to the second reference signal. In this way, the first signal receiving circuit and the second signal receiving circuit process the RF signal using different first reference signals and second reference signals, which is equivalent to using different channels to process RF signals from different GNSS.

[0194] In an embodiment of the present application, the second signal generating circuit can be turned on or off under the control of the first control circuit to meet the needs of different working modes. When different channels are required to process RF signals from the same GNSS system, the second signal generating circuit does not work. Then, even if the first signal generating circuit and the second signal generating circuit include components that are sensitive to frequency interference, such as voltage-controlled oscillation circuits, since only the first signal generating circuit is working, the inoperative second signal generating circuit will not interfere with the first signal generating circuit. In this way, the first signal generating circuit and the second signal generating circuit will not interfere with each other, and the accuracy of the first reference signal frequency can be ensured.

[0195] In some possible implementations, the step S901 includes: generating a first reference signal according to a first generation parameter, the first generation parameter including a first frequency band, and a frequency of the first reference signal is within the first frequency band;

[0196] The method also includes: controlling the second signal generating circuit to generate a second reference signal according to a second generating parameter, the second generating parameter including a second frequency band, and the frequency of the second reference signal is within the second frequency band; determining whether the first frequency band matches the second frequency band; if the first frequency band matches the second frequency band, turning off the second signal generating circuit and turning on the switch circuit so that the first signal generating circuit provides the first reference signal to the second signal receiving circuit. In this way, the first signal receiving circuit and the second signal receiving circuit use the same first reference signal to process the first RF signal and the second RF signal, which is equivalent to using different channels to process RF signals from the same GNSS.

[0197] In some possible implementations, the method further includes:

[0198] If the first frequency band does not match the second frequency band, the second signal generating circuit is turned on and the switch circuit is turned off, so that the second signal generating circuit provides a second reference signal for the second signal receiving circuit.

[0199] If the first frequency band does not match the second frequency band, it means that the first signal receiving circuit and the second signal receiving circuit need to process the RF signals from different GNSS systems or different frequency bands. Then the RF signals from different frequency bands of the same GNSS system can be called second RF signals, and the RF signals from different GNSS systems received by the second signal receiving circuit can be called third RF signals. In other words, if the first frequency band does not match the second frequency band, the second signal receiving circuit can receive the second RF signal or the third RF signal that belongs to a different frequency band from the first RF signal.

[0200] The first signal receiving circuit can process the first RF signal according to the first reference signal, and the second signal receiving circuit can process the second RF signal or the third RF signal according to the second reference signal. In this way, the first signal receiving circuit and the second signal receiving circuit process the RF signal using different first reference signals and second reference signals, which is equivalent to using different channels to process RF signals from different GNSS.

[0201] In the embodiment of the present application, the second control circuit can actively analyze the first generation parameter and the second generation parameter, determine whether the first signal generation circuit and the second signal generation circuit are working in the same frequency mode by judging whether the first frequency band matches the second frequency band, and then control the second signal generation circuit and the switch circuit. In this way, the working state of the signal processing device can be determined according to the actual needs of the terminal device to prevent the first signal generation circuit and the second signal generation circuit from interfering with each other, thereby ensuring the accuracy of the first reference signal frequency.

[0202] Regarding the signal processing method provided in this embodiment, its specific implementation steps can refer to the description of the aforementioned embodiment 1 or embodiment 2, and will not be repeated here.

[0203] Embodiment 4:

[0204] Embodiment 4 of the present application provides a signal processing system, which is described in detail below with reference to the accompanying drawings.

[0205] See also Fig.10 , which is a schematic diagram of the structure of a signal processing system provided in an embodiment of the present application. The system may include a first signal receiving antenna 1010, a second signal receiving antenna 1020, and a signal processing device 1030. The signal processing device is the signal processing device described in Embodiment 1 or Embodiment 2.

[0206] The first signal receiving antenna 1010 is connected to the first signal receiving circuit 1032 of the signal processing device 1030, and is used to receive a first radio frequency signal and send the first radio frequency signal to the first signal receiving circuit 1032;

[0207] The second signal receiving antenna 1020 is connected 1033 to the second signal receiving circuit of the signal processing device 1030, and is used to receive the second radio frequency signal or the third radio frequency signal, and send the second radio frequency signal or the third radio frequency signal to the second signal receiving circuit 1033;

[0208] The signal processing device 1030 includes a first signal generating circuit 1031, a first signal receiving circuit 1032 and a second signal receiving circuit 1033, which are used to obtain a first signal and a second signal according to the first radio frequency signal and the second radio frequency signal, and send the first signal and the second signal to the baseband chip 1040, so as to determine the position of the signal processing system according to the first signal and the second signal.

[0209] In this embodiment, the signal processing system can receive radio frequency signals at different positions through the first signal receiving antenna 1010 and the second signal receiving antenna 1020. Then the signal processing device 1030 is used to generate a first reference signal, and the radio frequency signals received by the first signal receiving antenna 1010 and the second signal receiving antenna 1020 are processed into the first signal and the second signal using the first reference signal. Since the frequency bands described in the first signal and the second signal are the same, and both are obtained by processing using the same first reference signal, the first signal and the second signal are signals from the same GNSS system. In this way, the signal processing device 1030 can send the obtained first signal or second signal to the baseband chip or the central processing unit (CPU), so as to determine the position of the signal processing system based on the first signal and the second signal as a reference to each other, reduce the positioning error, and meet the needs of high-precision applications. In addition, when the system needs to use different signal processing circuits to process signals of different frequency bands, the second signal receiving antenna can also receive radio frequency signals of other frequency bands, for example, it can include a second radio frequency signal belonging to the same GNSS system as the first radio frequency signal and a different frequency band, or a third radio frequency signal belonging to a different GNSS system from the first radio frequency signal. The processing of the signal by the signal processing device can refer to the description of the above-mentioned embodiments 1 to 3, which will not be repeated here.

[0210] The above describes the case where the signal processing system uses two antennas to receive two RF signals. In some possible implementations, the signal processing system can also use one antenna to receive two RF signals. When the signal processing system uses one antenna to receive two RF signals, the system structure can be as follows: Fig.11 The connection relationship and specific uses of each module can be referred to the previous description, which will not be repeated here.

[0211] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referred to each other. For the system or device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part description.

[0212] It should be understood that in the present application, "at least one (item)" means one or more, and "plurality" means two or more. "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 objects associated before and after are in an "or" relationship. "At least one of the following" 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.

[0213] It should also be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0214] The steps of the method or algorithm described in conjunction with the embodiments disclosed herein may be implemented directly using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0215] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A signal processing device, characterized in that: The device comprises a first signal receiving circuit, a second signal receiving circuit, a first signal generating circuit, a switch circuit, a second signal generating circuit and a first control circuit; The first signal generating circuit is used to generate a first reference signal and provide the first reference signal to the first signal receiving circuit; The second signal generating circuit is used to generate a second reference signal and provide the second reference signal to the second signal receiving circuit; The first end of the switch circuit is connected to the output end of the first signal generating circuit, and the second end of the switch circuit is connected to the input end of the second signal receiving circuit; When the switch circuit is turned on, the first signal generating circuit provides the first reference signal to the second signal receiving circuit; The first signal receiving circuit is used to receive a first radio frequency signal, and process the first radio frequency signal according to the first reference signal to obtain a first signal; The second signal receiving circuit is used to receive a second radio frequency signal and process the second radio frequency signal according to the first reference signal to obtain a second signal; The first control circuit is used to, in response to the same frequency configuration instruction, turn off the second signal generating circuit and turn on the switch circuit, so that the first signal generating circuit provides the first reference signal to the second signal receiving circuit; In response to the different frequency configuration instruction, turn on the second signal generating circuit and turn off the switch circuit, so that the second signal generating circuit provides a second reference signal for the second signal receiving circuit; The first radio frequency signal and the second radio frequency signal are radio frequency signals from the same global navigation satellite system, and the frequencies of the first signal and the second signal are both within a preset frequency band.

2. The device according to claim 1, characterized in that The switch circuit includes a first sub-switch circuit and a second sub-switch circuit, the first reference signal includes a first sub-reference signal and a second sub-reference signal, and the first sub-reference signal and the second sub-reference signal are differential signals; A first end of the first sub-switch circuit is connected to a first output end of the first signal generating circuit, and a second end of the first sub-switch circuit is connected to a first input end of the second signal receiving circuit; A first end of the second sub-switch circuit is connected to a second output end of the first signal generating circuit, and a second end of the second sub-switch circuit is connected to a second input end of the second signal receiving circuit; When the first sub-switch circuit is turned on, the first signal generating circuit provides the first sub-reference signal to the second signal receiving circuit; When the second sub-switch circuit is turned on, the first signal generating circuit provides the second sub-reference signal to the second signal receiving circuit.

3. The device according to any one of claims 1 to 2, characterized in that: The first signal receiving circuit includes a first mixer and a first filter, and the second signal receiving circuit includes a second mixer and a second filter; The input end of the first mixer is connected to the output end of the first signal generating circuit, and is used to mix the first RF signal according to the first reference signal to obtain a first mixed signal; The first filter is used to filter the first mixed signal to obtain the first signal; The input end of the second mixer is connected to the output end of the first signal generating circuit, and is used to mix the second RF signal according to the first reference signal to obtain a second mixed signal; The second filter is used to filter the second mixed signal to obtain the second signal.

4. A signal processing device, characterized in that: The device comprises a first signal receiving circuit, a second signal receiving circuit, a first signal generating circuit, a switch circuit, a second signal generating circuit, and a second control circuit; The first signal generating circuit is configured to generate a first reference signal according to a first generating parameter, wherein the first generating parameter includes a first frequency band, and a frequency of the first reference signal is within the first frequency band; The second signal generating circuit is configured to generate a second reference signal according to a second generating parameter, wherein the second generating parameter includes a second frequency band, and the frequency of the second reference signal is within the second frequency band; The first end of the switch circuit is connected to the output end of the first signal generating circuit, and the second end of the switch circuit is connected to the input end of the second signal receiving circuit; When the switch circuit is turned on, the first signal generating circuit provides the first reference signal to the second signal receiving circuit; The first signal receiving circuit is used to receive a first radio frequency signal, and process the first radio frequency signal according to the first reference signal to obtain a first signal; The second signal receiving circuit is used to receive a second radio frequency signal and process the second radio frequency signal according to the first reference signal to obtain a second signal; The second control circuit is used to determine whether the first frequency band matches the second frequency band; if the first frequency band matches the second frequency band, turn off the second signal generating circuit and turn on the switch circuit so that the first signal generating circuit provides a first reference signal to the second signal receiving circuit; If the first frequency band does not match the second frequency band, turning on the second signal generating circuit and turning off the switch circuit, so that the second signal generating circuit provides a second reference signal for the second signal receiving circuit; The first radio frequency signal and the second radio frequency signal are radio frequency signals from the same global navigation satellite system, and the frequencies of the first signal and the second signal are both within a preset frequency band.

5. A signal processing method, characterized in that: The method is applied to the signal processing device according to claim 1; The method comprises: In response to the same-frequency configuration instruction, a first radio frequency signal and a second radio frequency signal are received; a first reference signal is generated; the first radio frequency signal is processed according to the first reference signal to obtain a first signal, and the second radio frequency signal is processed according to the first reference signal to obtain a second signal; the first radio frequency signal and the second radio frequency signal are radio frequency signals from the same frequency band of the same global navigation satellite system, and the frequencies of the first signal and the second signal are both within a preset frequency band; In response to the inter-frequency configuration instruction, a first radio frequency signal and a second radio frequency signal are received; a first reference signal and a second reference signal are generated; the first radio frequency signal is processed according to the first reference signal to obtain a first signal, and the second radio frequency signal is processed according to the second reference signal to obtain a second signal; the first radio frequency signal and the second radio frequency signal are radio frequency signals from different frequency bands of the same global navigation satellite system, and the frequencies of the first signal and the second signal are both within a preset frequency band; or, Receive a first radio frequency signal and a third radio frequency signal; generate a first reference signal and a second reference signal; process the first radio frequency signal according to the first reference signal to obtain a first signal, and process the third radio frequency signal according to the second reference signal to obtain a third signal; the first radio frequency signal and the third radio frequency signal are radio frequency signals from different global navigation satellite systems, and the frequencies of the first signal and the third signal are both within a preset frequency band.

6. A signal processing method, characterized in that: The method is applied to the signal processing device according to claim 4; The method comprises: Receiving a first generation parameter and a second generation parameter, wherein the first generation parameter includes a first frequency band, and the second generation parameter includes a second frequency band; In response to the first frequency band being matched with the second frequency band, receiving a first radio frequency signal and a second radio frequency signal; generating a first reference signal according to the first generation parameter; processing the first radio frequency signal according to the first reference signal to obtain a first signal, and processing the second radio frequency signal according to the first reference signal to obtain a second signal; the first radio frequency signal and the second radio frequency signal are radio frequency signals from the same frequency band of the same global navigation satellite system, and the frequencies of the first signal and the second signal are both within a preset frequency band; In response to the first frequency band not matching the second frequency band, receiving a first radio frequency signal and a second radio frequency signal; generating a first reference signal and a second reference signal; processing the first radio frequency signal according to the first reference signal to obtain a first signal, and processing the second radio frequency signal according to the second reference signal to obtain a second signal; the first radio frequency signal and the second radio frequency signal are radio frequency signals from different frequency bands of the same global navigation satellite system, and the frequencies of the first signal and the second signal are both within a preset frequency band; or, Receive a first RF signal and a third RF signal; generate a first reference signal according to the first generation parameter, and generate a second reference signal according to the second generation parameter; process the first RF signal according to the first reference signal to obtain a first signal, and process the third RF signal according to the second reference signal to obtain a third signal; the first RF signal and the third RF signal are RF signals from different global navigation satellite systems, and frequencies of the first signal and the third signal are both within a preset frequency band.

7. A signal processing system, characterized in that: The system includes a first signal receiving antenna, a second signal receiving antenna and a signal processing device; The first signal receiving antenna is connected to the first signal receiving circuit of the signal processing device, and is used to receive a first radio frequency signal and send the first radio frequency signal to the first signal receiving circuit; the second signal receiving antenna is connected to the second signal receiving circuit of the signal processing device, and is used to receive a second radio frequency signal or a third radio frequency signal, and send the second radio frequency signal or the third radio frequency signal to the first signal receiving circuit; the first radio frequency signal and the second radio frequency signal are radio frequency signals from the same global navigation satellite system; the first radio frequency signal and the third radio frequency signal are radio frequency signals from different global navigation satellite systems; The signal processing device includes the signal processing device according to any one of claims 1 to 4, and is used to obtain a first signal based on the first radio frequency signal, obtain a second signal or a third signal based on the second radio frequency signal or the third radio frequency signal, and send the first signal and the second signal or the third signal to a baseband chip, so as to determine the position of the signal processing system based on the first signal and the second signal or the third signal.

8. A signal processing system, characterized in that: The system includes a third signal receiving antenna and a signal processing device; The third signal receiving antenna is connected to the first signal receiving circuit and the second signal receiving circuit of the signal processing device, and is used to receive a first radio frequency signal and a second radio frequency signal, and send the first radio frequency signal to the first signal receiving circuit, and send the second radio frequency signal to the second signal receiving circuit; or, receive a first radio frequency signal and a third radio frequency signal, and send the first radio frequency signal to the first signal receiving circuit, and send the third radio frequency signal to the second signal receiving circuit; the first radio frequency signal and the second radio frequency signal are radio frequency signals from the same global navigation satellite system; the first radio frequency signal and the third radio frequency signal are radio frequency signals from different global navigation satellite systems; The signal processing device includes the signal processing device according to any one of claims 1 to 4, and is used to obtain a first signal based on the first radio frequency signal, obtain a second signal or a third signal based on the second radio frequency signal or the third radio frequency signal, and send the first signal and the second signal or the third signal to a baseband chip, so as to determine the position of the signal processing system based on the first signal and the second signal or the third signal.

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