Broadband frequency modulated continuous wave radar resolution-loss detection device and method

Abstract

This application relates to a resolution-loss-free detection device and method for broadband frequency-modulated continuous wave (FMMC) radar, comprising: an FMMC continuous wave generation module for generating a broadband FMMC continuous wave and transmitting it to a target radar; a reference waveform generation module for generating a single-frequency signal and obtaining a target duration reference waveform based on the single-frequency signal and the broadband FMMC continuous wave; a mixing module for receiving the echo signal generated based on the broadband FMMC continuous wave transmitted by the target radar and generating an intermediate frequency (IF) signal corresponding to the echo signal in conjunction with the target duration reference waveform; and a signal processing module for obtaining a digital signal corresponding to the IF signal based on the IF signal and performing a preset signal transformation operation on the digital signal to generate a resolution-loss-free image corresponding to the broadband FMMC continuous wave. This solves the problems of high cost, high complexity, and limited applicability of existing broadband radar resolution-loss-free reception technologies.

Description

Technical Field

[0001] This application relates to the field of radar technology, and in particular to a broadband frequency modulated continuous wave radar detection device and method with no resolution loss. Background Technology

[0002] Radar is a device that uses electromagnetic waves to detect targets. It transmits electromagnetic wave signals and receives the reflected echoes from targets to obtain information such as the target's distance, velocity, acceleration, and characteristics. Wideband radar, due to its high-resolution imaging capabilities, has been widely used in aerospace, remote sensing, and military reconnaissance.

[0003] Resolution-loss-free reception technology for broadband radar has always been an open problem: traditional matched-filter-based reception methods can achieve resolution-loss-free reception and detection by acquiring the time-domain waveform of the echo and combining it with digital signal processing. However, the processing bandwidth of the ADC (Analog-to-Digital Converter) required for matched filtering needs to be consistent with the signal bandwidth, thus making it unsuitable for high-resolution reception and detection of broadband radar. Frequency-modulated continuous-wave radar achieves narrowband reception of broadband signals by mixing the received echo with a reference waveform (the transmitted waveform after delay). However, the finite duration of the reference waveform limits the duration of the intermediate frequency signal after mixing, leading to a loss of resolution.

[0004] To address the aforementioned issues, existing technologies have redesigned long-duration broadband reference waveforms. One approach involves using a linear frequency modulated (LFM) wave with the same chirp rate as the echo chirp rate but with increased bandwidth. However, this technique is limited by the signal bandwidth, resulting in a limited bandwidth for the generated reference waveform. Consequently, it can only mitigate resolution loss but cannot truly achieve lossless reception. Another approach uses a piecewise LFM wave, supplemented by subsequent digital signal processing, to achieve lossless reception. However, this solution is only applicable to transmit waveforms with a fixed duty cycle of 50% and requires additional signal recovery algorithms, limiting its applicability. Furthermore, both approaches require additional broadband signal sources, significantly increasing system cost and complexity.

[0005] In summary, existing broadband radar resolution-loss-free reception technology systems are costly, complex, and have limited applicability, and urgently need to be addressed. Summary of the Invention

[0006] This application provides a broadband frequency modulated continuous wave radar resolution-loss detection device and method to solve the problems of high cost, high complexity, and limited applicability of existing broadband radar resolution-loss receiving technology systems.

[0007] The first aspect of this application provides a resolution-loss-free detection device for broadband frequency-modulated continuous wave radar, comprising: a frequency-modulated continuous wave generation module for generating a broadband frequency-modulated continuous wave and transmitting the broadband frequency-modulated continuous wave to a target radar; a reference waveform generation module for generating a single-frequency signal and obtaining a target duration reference waveform based on the single-frequency signal and the broadband frequency-modulated continuous wave; a mixing module for receiving an echo signal generated based on the broadband frequency-modulated continuous wave transmitted by the target radar and generating an intermediate frequency signal corresponding to the echo signal in combination with the target duration reference waveform; and a signal processing module for obtaining a digital signal corresponding to the intermediate frequency signal based on the intermediate frequency signal and performing a preset signal transformation operation on the digital signal to generate a resolution-loss-free image corresponding to the broadband frequency-modulated continuous wave.

[0008] Optionally, in one embodiment of this application, the reference waveform generation module includes: a microwave source for generating the single-frequency signal; and a first electro-optic conversion unit for performing electro-optic conversion modulation on the broadband frequency-modulated continuous wave based on the single-frequency signal to generate the target duration reference waveform.

[0009] Optionally, in one embodiment of this application, the mixing module includes: a second electro-optic conversion unit, configured to receive the echo signal corresponding to the broadband frequency-modulated continuous wave, and perform electro-optic conversion modulation on the echo signal to obtain an optical domain echo signal; and a photoelectric conversion unit, configured to perform photoelectric conversion modulation on the optical domain echo signal to obtain a microwave domain echo signal, and perform mixing processing on the microwave domain echo signal based on the target duration reference waveform to generate the intermediate frequency signal.

[0010] Optionally, in one embodiment of this application, the signal processing module includes: an analog-to-digital converter, configured to perform a sampling operation on the intermediate frequency signal to obtain an intermediate frequency signal sample, and to perform quantization processing on the intermediate frequency signal sample to obtain the digital signal; and a signal transformation unit, configured to perform a fast Fourier transform on the digital signal to generate the resolution-loss-free image.

[0011] A second aspect of this application provides a resolution-free detection method for broadband frequency-modulated continuous wave radar, comprising the following steps: generating a broadband frequency-modulated continuous wave and a single-frequency signal, transmitting the broadband frequency-modulated continuous wave to a target radar, and obtaining a target duration reference waveform based on the single-frequency signal and the broadband frequency-modulated continuous wave; receiving an echo signal generated based on the broadband frequency-modulated continuous wave transmitted by the target radar, and generating an intermediate frequency signal corresponding to the echo signal in combination with the target duration reference waveform; obtaining a digital signal corresponding to the intermediate frequency signal based on the intermediate frequency signal, and performing a preset signal transformation operation on the digital signal to generate a resolution-free image corresponding to the broadband frequency-modulated continuous wave.

[0012] Optionally, in one embodiment of this application, generating a broadband frequency-modulated continuous wave and a single-frequency signal, sending the broadband frequency-modulated continuous wave to the target radar, and obtaining a target duration reference waveform based on the single-frequency signal and the broadband frequency-modulated continuous wave includes: performing electro-optic conversion modulation on the broadband frequency-modulated continuous wave based on the single-frequency signal to generate the target duration reference waveform.

[0013] Optionally, in one embodiment of this application, the step of receiving the echo signal generated based on the broadband frequency-modulated continuous wave sent by the target radar and generating an intermediate frequency signal corresponding to the echo signal in combination with the target duration reference waveform includes: receiving the echo signal corresponding to the broadband frequency-modulated continuous wave and performing electro-optic conversion modulation on the echo signal to obtain an optical domain echo signal; performing photoelectric conversion modulation on the optical domain echo signal to obtain a microwave domain echo signal, and performing frequency mixing processing on the microwave domain echo signal based on the target duration reference waveform to generate the intermediate frequency signal.

[0014] Optionally, in one embodiment of this application, the step of obtaining the digital signal corresponding to the intermediate frequency signal based on the intermediate frequency signal and performing a preset signal transformation operation on the digital signal to generate a resolution-free loss image corresponding to the broadband frequency-modulated continuous wave includes: performing a sampling operation on the intermediate frequency signal to obtain intermediate frequency signal samples, and performing quantization processing on the intermediate frequency signal samples to obtain the digital signal; performing a fast Fourier transform on the digital signal to generate the resolution-free loss image.

[0015] A third aspect of this application provides an electronic device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the broadband frequency-modulated continuous wave radar resolution-loss-free detection method as described in the above embodiments.

[0016] A fourth aspect of this application provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described broadband frequency-modulated continuous wave radar detection method without resolution loss.

[0017] Therefore, the embodiments of this application have the following beneficial effects:

[0018] The embodiments of this application include: a frequency-modulated continuous wave (FMMC) generation module for generating a broadband FMMC continuous wave and transmitting it to a target radar; a reference waveform generation module for generating a single-frequency signal and obtaining a target duration reference waveform based on the single-frequency signal and the broadband FMMC continuous wave; a mixing module for receiving the echo signal generated from the broadband FMMC continuous wave transmitted by the target radar and generating an intermediate frequency (IF) signal corresponding to the echo signal in combination with the target duration reference waveform; and a signal processing module for obtaining a digital signal corresponding to the IF signal based on the IF signal and performing a preset signal transformation operation on the digital signal to generate a resolution-loss-free image corresponding to the broadband FMMC continuous wave. This application not only achieves resolution-loss-free reception but also eliminates the need for additional broadband signal sources and signal recovery algorithms, significantly reducing system cost and complexity. Therefore, it solves the problems of high system cost, high complexity, and limited applicability of existing broadband radar resolution-loss-free reception technologies.

[0019] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0020] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0021] Figure 1 This is an example diagram of a resolution-loss-free detection device for broadband frequency-modulated continuous wave radar provided according to an embodiment of this application;

[0022] Figure 2 A schematic diagram of the structure of a reference waveform generation module and a mixing module is provided for one embodiment of this application;

[0023] Figure 3 A schematic diagram of the logic architecture of a resolution-loss-free detection device for broadband frequency-modulated continuous wave radar is provided as an embodiment of this application;

[0024] Figure 4 A schematic diagram of a one-dimensional range imaging result of four point targets after conventional broadband frequency-modulated continuous wave deslant reception, provided as an embodiment of this application;

[0025] Figure 5 A schematic diagram of a one-dimensional range imaging result of four point targets after processing by a broadband frequency modulated continuous wave radar with no resolution loss detection device, provided as an embodiment of this application;

[0026] Figure 6 This is a flowchart of a resolution-loss-free detection method for broadband frequency-modulated continuous wave radar according to an embodiment of this application;

[0027] Figure 7 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application.

[0028] Among them, 10-wideband frequency modulated continuous wave radar resolution loss detection device, 100-frequency modulated continuous wave generation module, 200-reference waveform generation module, 300-mixing module, 400-signal processing module, 701-memory, 702-processor, and 703-communication interface. Detailed Implementation

[0029] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0030] The following describes a broadband frequency-modulated continuous wave radar resolution-loss-free detection device and method according to embodiments of this application, with reference to the accompanying drawings. Addressing the problems mentioned in the background section, this application provides a broadband frequency-modulated continuous wave radar resolution-loss-free detection device. This device includes a frequency-modulated continuous wave generation module for generating a broadband frequency-modulated continuous wave and transmitting it to a target radar; a reference waveform generation module for generating a single-frequency signal and obtaining a target duration reference waveform based on the single-frequency signal and the broadband frequency-modulated continuous wave; a mixing module for receiving the echo signal generated based on the broadband frequency-modulated continuous wave transmitted by the target radar and generating an intermediate frequency (IF) signal corresponding to the echo signal by combining it with the target duration reference waveform; and a signal processing module for obtaining a digital signal corresponding to the IF signal based on the IF signal and performing a preset signal transformation operation on the digital signal to generate a resolution-loss-free image corresponding to the broadband frequency-modulated continuous wave. This application not only achieves resolution-loss-free reception but also eliminates the need for additional broadband signal sources and signal recovery algorithms, significantly reducing system cost and complexity. Therefore, it solves the problems of high system cost, high complexity, and limited applicability of existing broadband radar resolution-loss-free reception technologies.

[0031] Specifically, Figure 1 This is a block diagram illustrating resolution-loss-free detection using a broadband frequency-modulated continuous wave radar according to an embodiment of this application.

[0032] like Figure 1 As shown, the broadband frequency modulated continuous wave radar detection without resolution loss 10 includes: a frequency modulated continuous wave generation module 100, a reference waveform generation module 200, a mixing module 300, and a signal processing module 400.

[0033] The frequency modulated continuous wave generation module 100 is used to generate a broadband frequency modulated continuous wave and send the broadband frequency modulated continuous wave to the target radar.

[0034] The embodiments of this application can generate the broadband frequency-modulated continuous wave required for detection through the frequency-modulated continuous wave generation module, and send it to the reference waveform generation module (i.e., the long-duration reference waveform generation module), and at the same time transmit the broadband frequency-modulated continuous wave to the target radar, thereby providing data support for the generation and modulation of subsequent echo signals.

[0035] The reference waveform generation module 200 is used to generate a single-frequency signal and obtain a target duration reference waveform based on the single-frequency signal and the broadband frequency-modulated continuous wave.

[0036] Furthermore, embodiments of this application can utilize a long-duration reference waveform generation module to generate a target duration reference waveform, i.e., a long-duration reference waveform, required for resolution-loss-free reception, based on a reference frequency-modulated continuous wave and a single-frequency signal input from a microwave source, and then send it to a subsequent mixing module for mixing processing. It should be noted that the frequency of the microwave source is half the bandwidth B of the frequency-modulated continuous wave.

[0037] Therefore, the embodiments of this application generate the required long-duration broadband reference waveform by utilizing the existing transmitted waveform, thereby eliminating the need for an additional broadband signal source and greatly reducing the cost and complexity of the system.

[0038] Optionally, in one embodiment of this application, the reference waveform generation module 200 includes a microwave source and a first electro-optic conversion unit.

[0039] Among them, the microwave source is used to generate a single-frequency signal.

[0040] The first electro-optic conversion unit is used to perform electro-optic conversion modulation on a broadband frequency-modulated continuous wave based on a single-frequency signal to generate a target duration reference waveform.

[0041] It should be noted that, in the embodiments of this application, the reference waveform generation module (i.e., the long-duration reference waveform generation module) includes two parts: a microwave source and a first electro-optic conversion unit, such as... Figure 2 As shown.

[0042] Specifically, embodiments of this application can utilize a light source to provide the optical carrier necessary for electro-optic conversion, which outputs a single-wavelength continuous light wave. Its operating wavelength should be within the operating wavelength range of the first electro-optic conversion unit, and its output terminal is connected to the input terminal of the first electro-optic conversion unit. In addition, the first electro-optic conversion unit includes an electro-optic modulator, which is mainly used to generate a long-duration reference waveform. In actual execution, the response rate of the electro-optic modulator is greater than the highest frequency of the frequency-modulated continuous wave, and its output is connected to the subsequent second electro-optic conversion unit.

[0043] Therefore, embodiments of this application can generate a long-duration reference waveform required for resolution-loss-free reception based on a reference frequency-modulated continuous wave and a single-frequency signal input from a microwave source.

[0044] The mixer module 300 is used to receive the echo signal generated by the target radar based on the broadband frequency modulated continuous wave, and combine it with the target duration reference waveform to generate the intermediate frequency signal corresponding to the echo signal.

[0045] After generating a long-duration reference waveform through the reference waveform generation module, the embodiments of this application further receive the echo signal corresponding to the broadband frequency-modulated continuous wave transmitted by the radar, and perform corresponding modulation and mixing operations on the echo signal according to the long-duration reference waveform, thereby generating an intermediate frequency signal corresponding to the echo signal.

[0046] Optionally, in one embodiment of this application, the mixing module 300 includes: a second electro-optical conversion unit and a photoelectric conversion unit.

[0047] The second electro-optic conversion unit is used to receive the echo signal corresponding to the broadband frequency-modulated continuous wave and perform electro-optic conversion modulation on the echo signal to obtain the optical domain echo signal.

[0048] The photoelectric conversion unit is used to perform photoelectric conversion modulation on the optical domain echo signal to obtain the microwave domain echo signal, and to perform frequency mixing processing on the microwave domain echo signal based on the target duration reference waveform to generate an intermediate frequency signal.

[0049] In the embodiments of this application, the mixing module includes two parts: a second electro-optical conversion unit and a photoelectric conversion unit, such as... Figure 2 As shown.

[0050] The second electro-optic conversion unit includes an electro-optic modulator, which is mainly used to modulate the echo signal from the microwave domain to the optical domain to obtain an optical echo signal. It should be noted that the response rate of the electro-optic modulator is greater than the highest frequency of the broadband echo, and its output is connected to the photoelectric conversion unit.

[0051] The aforementioned photoelectric conversion unit includes a photodetector, which is used to convert the optical domain echo signal (i.e., optical signal) into a microwave domain echo signal (i.e., microwave signal), and simultaneously realize the mixing reception of broadband echoes to output the processed intermediate frequency signal. The response rate of the photodetector should be greater than the bandwidth B of the frequency-modulated continuous wave.

[0052] Therefore, the embodiments of this application construct microwave photonic links, thereby utilizing the nonlinear effects of electro-optic modulators and photodetectors to realize up-conversion and down-conversion of frequency-modulated continuous wave radar signals and the construction of long-duration broadband reference waveforms.

[0053] The signal processing module 400 is used to obtain the digital signal corresponding to the intermediate frequency signal based on the intermediate frequency signal, and to perform preset signal transformation operations on the digital signal to generate a resolution-loss-free image corresponding to the broadband frequency-modulated continuous wave.

[0054] After obtaining the intermediate frequency signal, embodiments of this application can acquire the digital signal corresponding to the intermediate frequency signal through a signal processing module, and generate a resolution-loss-free image corresponding to a broadband frequency-modulated continuous wave by performing signal transformation processing on the digital signal.

[0055] Therefore, the embodiments of this application utilize the periodicity and linear frequency modulation characteristics of frequency-modulated continuous wave radar signals to achieve resolution-loss-free reception of broadband frequency-modulated continuous waves without the need for additional broadband signal sources and signal recovery algorithms.

[0056] Optionally, in one embodiment of this application, the signal processing module 400 includes an analog-to-digital converter and a signal conversion unit.

[0057] The analog-to-digital converter (ADC) is used to perform sampling operations on the intermediate frequency (IF) signal to obtain IF signal samples, and to quantize the IF signal samples to obtain digital signals.

[0058] The signal transformation unit is used to perform fast Fourier transform on digital signals to generate images with no resolution loss.

[0059] It should be noted that, in the embodiments of this application, the signal processing module includes an analog-to-digital converter and a signal conversion unit.

[0060] Specifically, embodiments of this application can sample intermediate frequency signals using an analog-to-digital converter, such as... Figure 3 As shown, intermediate frequency signal samples are obtained, and then the intermediate frequency signal samples are quantized to generate digital signals; furthermore, embodiments of this application can perform fast Fourier transform on the digital signals to generate images without resolution loss.

[0061] In summary, the embodiments of this application construct the microwave photonic link for frequency conversion and reception through the nonlinear effect of the electro-optic modulator and photodetector. By utilizing the periodicity and linear frequency modulation characteristics of the frequency-modulated continuous wave radar signal, a long-duration broadband reference waveform is generated through up-conversion and down-conversion to achieve resolution-loss-free reception of broadband signals. This reduces the cost and complexity of the system while achieving resolution-loss-free reception.

[0062] The execution logic of the broadband frequency modulated continuous wave radar detection device with no resolution loss of this application will be further explained and introduced below through a specific embodiment and in conjunction with the accompanying drawings.

[0063] In one specific embodiment of this application, four point targets can be set at relative radar distances of 210m, 1440m, 1920m, and 2610m, respectively, and transmit a frequency-modulated continuous wave (FM wave) of 8-11.8GHz with a duration Tr = 20μs, a period T = 20μs, and a bandwidth B = 3.8GHz. The unambiguous range corresponding to the FM wave is 3km, and the corresponding theoretical 3dB range resolution is 0.886*c / 2B = 3.50cm (c is the speed of light 3×10⁸ m / s). A microwave source generates a single-frequency signal with a frequency of B / 2 = 1.9GHz.

[0064] In this specific embodiment, the broadband frequency modulated continuous wave radar detection device with no resolution loss of the present application is simulated and implemented.

[0065] Specifically, the one-dimensional range image of the echoes from the four point targets after being received by a traditional frequency-modulated continuous wave de-slant receiver is as follows: Figure 4 As shown, the distance resolutions are 3.76cm, 6.73cm, 5.46cm, and 4.02cm, all greater than the theoretical value of 3.50cm. By generating a long-duration reference waveform for mixing and receiving, the resulting one-dimensional range image is as follows: Figure 5 As shown, the distance resolutions are 3.50cm, 3.49cm, 3.49cm and 3.50cm, which are in good agreement with the theoretical values. This strongly demonstrates that the broadband frequency modulated continuous wave radar detection device of this application can effectively realize the resolution-loss-free reception and detection of broadband frequency modulated continuous wave radar.

[0066] The resolution-loss-free detection device for broadband frequency-modulated continuous wave radar according to the embodiments of this application includes a frequency-modulated continuous wave generation module for generating a broadband frequency-modulated continuous wave and transmitting it to a target radar; a reference waveform generation module for generating a single-frequency signal and obtaining a target duration reference waveform based on the single-frequency signal and the broadband frequency-modulated continuous wave; a mixing module for receiving the echo signal generated based on the broadband frequency-modulated continuous wave transmitted by the target radar and generating an intermediate frequency signal corresponding to the echo signal by combining it with the target duration reference waveform; and a signal processing module for obtaining a digital signal corresponding to the intermediate frequency signal based on the intermediate frequency signal and performing a preset signal transformation operation on the digital signal to generate a resolution-loss-free image corresponding to the broadband frequency-modulated continuous wave. This application not only achieves resolution-loss-free reception but also eliminates the need for additional broadband signal sources and signal recovery algorithms, greatly reducing system cost and complexity.

[0067] Secondly, with reference to the accompanying drawings, a broadband frequency modulated continuous wave radar detection method with no resolution loss according to an embodiment of this application is described.

[0068] Figure 6 This is a flowchart illustrating a resolution-loss-free detection method for broadband frequency-modulated continuous wave radar provided in an embodiment of this application.

[0069] like Figure 6 As shown, the resolution-loss-free detection method of broadband frequency-modulated continuous wave radar includes the following steps:

[0070] In step S601, a broadband frequency-modulated continuous wave and a single-frequency signal are generated, and the broadband frequency-modulated continuous wave is sent to the target radar. The target duration reference waveform is obtained based on the single-frequency signal and the broadband frequency-modulated continuous wave.

[0071] In step S602, the echo signal generated based on broadband frequency-modulated continuous wave sent by the target radar is received, and combined with the target duration reference waveform, the intermediate frequency signal corresponding to the echo signal is generated.

[0072] In step S603, the digital signal corresponding to the intermediate frequency signal is obtained based on the intermediate frequency signal, and a preset signal transformation operation is performed on the digital signal to generate a resolution-free image corresponding to the broadband frequency-modulated continuous wave.

[0073] Optionally, in one embodiment of this application, generating a broadband frequency-modulated continuous wave and a single-frequency signal, transmitting the broadband frequency-modulated continuous wave to the target radar, and obtaining a target duration reference waveform based on the single-frequency signal and the broadband frequency-modulated continuous wave, includes: performing electro-optic conversion modulation on the broadband frequency-modulated continuous wave based on the single-frequency signal to generate a target duration reference waveform.

[0074] Optionally, in one embodiment of this application, receiving the echo signal generated based on a broadband frequency-modulated continuous wave sent by the target radar, and generating an intermediate frequency signal corresponding to the echo signal in combination with the target duration reference waveform, includes: receiving the echo signal corresponding to the broadband frequency-modulated continuous wave, performing electro-optical conversion modulation on the echo signal to obtain an optical domain echo signal; performing photoelectric conversion modulation on the optical domain echo signal to obtain a microwave domain echo signal, and performing frequency mixing processing on the microwave domain echo signal based on the target duration reference waveform to generate an intermediate frequency signal.

[0075] Optionally, in one embodiment of this application, obtaining a digital signal corresponding to the intermediate frequency signal based on the intermediate frequency signal, and performing a preset signal transformation operation on the digital signal to generate a resolution-free loss image corresponding to a broadband frequency-modulated continuous wave, includes: performing a sampling operation on the intermediate frequency signal to obtain an intermediate frequency signal sample, and performing quantization processing on the intermediate frequency signal sample to obtain a digital signal; performing a fast Fourier transform on the digital signal to generate a resolution-free loss image.

[0076] It should be noted that the foregoing explanation of the broadband frequency modulated continuous wave radar resolution-loss detection device embodiment also applies to the broadband frequency modulated continuous wave radar resolution-loss detection method of this embodiment, and will not be repeated here.

[0077] The resolution-loss-free detection method for broadband frequency-modulated continuous wave radar proposed in this application generates a broadband frequency-modulated continuous wave and a single-frequency signal, and sends the broadband frequency-modulated continuous wave to the target radar. A target duration reference waveform is obtained based on the single-frequency signal and the broadband frequency-modulated continuous wave. The method receives the echo signal generated from the broadband frequency-modulated continuous wave sent by the target radar, and generates an intermediate frequency (IF) signal corresponding to the echo signal by combining it with the target duration reference waveform. A digital signal corresponding to the IF signal is obtained from the IF signal, and a preset signal transformation operation is performed on the digital signal to generate a resolution-loss-free image corresponding to the broadband frequency-modulated continuous wave. This application not only achieves resolution-loss-free reception but also eliminates the need for additional broadband signal sources and signal recovery algorithms, greatly reducing system cost and complexity.

[0078] Figure 7 A schematic diagram of the structure of an electronic device provided in an embodiment of this application. The electronic device may include:

[0079] The memory 701, the processor 702, and the computer program stored on the memory 701 and executable on the processor 702.

[0080] When the processor 702 executes the program, it implements the broadband frequency modulated continuous wave radar detection method with no resolution loss provided in the above embodiments.

[0081] Furthermore, electronic devices also include:

[0082] Communication interface 703 is used for communication between memory 701 and processor 702.

[0083] The memory 701 is used to store computer programs that can run on the processor 702.

[0084] The memory 701 may include high-speed RAM memory, and may also include non-volatile memory, such as at least one disk storage device.

[0085] If the memory 701, processor 702, and communication interface 703 are implemented independently, then the communication interface 703, memory 701, and processor 702 can be interconnected via a bus to complete communication between them. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be categorized as address buses, data buses, control buses, etc. For ease of representation, Figure 7The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0086] Optionally, in a specific implementation, if the memory 701, processor 702, and communication interface 703 are integrated on a single chip, then the memory 701, processor 702, and communication interface 703 can communicate with each other through an internal interface.

[0087] The processor 702 may be a central processing unit (CPU), an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of this application.

[0088] This application also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the above-described broadband frequency-modulated continuous wave radar detection method without resolution loss.

[0089] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0090] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0091] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or N executable instructions for implementing custom logic functions or processes, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of this application pertain.

[0092] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0093] It should be understood that the various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, the N steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0094] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0095] Furthermore, the functional units in the various embodiments of this application can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0096] The storage medium mentioned above can be a read-only memory, a disk, or an optical disk, etc. Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this application.

Claims

1. A broadband frequency-modulated continuous wave radar detection device with no resolution loss, characterized in that, include: A frequency-modulated continuous wave generation module is used to generate a broadband frequency-modulated continuous wave and send the broadband frequency-modulated continuous wave to the target radar; A reference waveform generation module is used to generate a single-frequency signal and obtain a target duration reference waveform based on the single-frequency signal and the broadband frequency-modulated continuous wave. A mixing module is used to receive the echo signal generated based on the broadband frequency-modulated continuous wave sent by the target radar, and generate an intermediate frequency signal corresponding to the echo signal in combination with the target duration reference waveform. The signal processing module is used to obtain the digital signal corresponding to the intermediate frequency signal based on the intermediate frequency signal, and to perform a preset signal transformation operation on the digital signal to generate a resolution-loss-free image corresponding to the broadband frequency-modulated continuous wave.

2. The apparatus according to claim 1, characterized in that, The reference waveform generation module includes: A microwave source is used to generate the single-frequency signal; The first electro-optic conversion unit is used to perform electro-optic conversion modulation on the broadband frequency-modulated continuous wave based on the single-frequency signal to generate the target duration reference waveform.

3. The apparatus according to claim 1, characterized in that, The mixing module includes: The second electro-optic conversion unit is used to receive the echo signal corresponding to the broadband frequency-modulated continuous wave, and to perform electro-optic conversion modulation on the echo signal to obtain an optical domain echo signal. The photoelectric conversion unit is used to perform photoelectric conversion modulation on the optical domain echo signal to obtain a microwave domain echo signal, and to perform frequency mixing processing on the microwave domain echo signal based on the target duration reference waveform to generate the intermediate frequency signal.

4. The apparatus according to claim 1, characterized in that, The signal processing module includes: An analog-to-digital converter is used to perform a sampling operation on the intermediate frequency signal to obtain an intermediate frequency signal sample, and to quantize the intermediate frequency signal sample to obtain the digital signal; The signal transformation unit is used to perform a fast Fourier transform on the digital signal to generate the resolution-loss-free image.

5. A resolution-loss-free detection method for broadband frequency-modulated continuous wave radar, characterized in that, Includes the following steps: Generate a broadband frequency-modulated continuous wave and a single-frequency signal, and send the broadband frequency-modulated continuous wave to the target radar, and obtain the target duration reference waveform based on the single-frequency signal and the broadband frequency-modulated continuous wave; The system receives the echo signal generated by the target radar based on the broadband frequency-modulated continuous wave, and generates the intermediate frequency signal corresponding to the echo signal by combining it with the target duration reference waveform. The digital signal corresponding to the intermediate frequency signal is obtained from the intermediate frequency signal, and a preset signal transformation operation is performed on the digital signal to generate a resolution-loss-free image corresponding to the broadband frequency-modulated continuous wave.

6. The method according to claim 5, characterized in that, The process of generating a broadband frequency-modulated continuous wave and a single-frequency signal, transmitting the broadband frequency-modulated continuous wave to the target radar, and obtaining a target duration reference waveform based on the single-frequency signal and the broadband frequency-modulated continuous wave includes: Based on the single-frequency signal, the broadband frequency-modulated continuous wave is electro-optically converted and modulated to generate the target duration reference waveform.

7. The method according to claim 5, characterized in that, The step of receiving the echo signal generated based on the broadband frequency-modulated continuous wave sent by the target radar, and generating the intermediate frequency signal corresponding to the echo signal in combination with the target duration reference waveform, includes: The echo signal corresponding to the broadband frequency-modulated continuous wave is received, and the echo signal is electro-optically converted and modulated to obtain an optical domain echo signal. The optical domain echo signal is photoelectrically converted and modulated to obtain a microwave domain echo signal. Based on the target duration reference waveform, the microwave domain echo signal is mixed to generate the intermediate frequency signal.

8. The method according to claim 5, characterized in that, The step of obtaining the digital signal corresponding to the intermediate frequency signal based on the intermediate frequency signal, and performing a preset signal transformation operation on the digital signal to generate a resolution-loss-free image corresponding to the broadband frequency-modulated continuous wave, includes: A sampling operation is performed on the intermediate frequency signal to obtain an intermediate frequency signal sample, and the intermediate frequency signal sample is quantized to obtain the digital signal; The digital signal is subjected to a Fast Fourier Transform to generate the resolution-loss-free image.

9. An electronic device, characterized in that, include: A memory, a processor, and a computer program stored in the memory and executable on the processor, the processor executing the program to implement the broadband frequency modulated continuous wave radar resolution-loss-free detection method as described in any one of claims 5-8.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, The program is executed by the processor to implement the wideband frequency modulated continuous wave radar resolution-loss detection method as described in any one of claims 5-8.

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