Microwave photon wideband radar range dimension filtering receiving device and method

Abstract

The application relates to a microwave photon wideband radar range dimension filtering receiving device and method, which comprises the following modules: a signal generation module, which is used for generating a multi-component sweep signal and receiving a target echo signal transmitted by a target radar; a hardware processing module, which is used for performing a bandwidth compression operation on the target echo signal based on the multi-component sweep signal to obtain an intermediate frequency compression signal corresponding to the target echo signal; and a signal conversion module, which is used for performing a sampling and quantization operation on the intermediate frequency compression signal to obtain a digital signal corresponding to the intermediate frequency compression signal, and generating a wideband signal range dimension filtering result according to the digital signal. Therefore, the problems that the existing range dimension filtering technology greatly influences the target echo signal-to-noise ratio and the filtering distance range is narrow are solved.

Description

Technical Field

[0001] This application relates to the field of radar technology, and in particular to a microwave photonic broadband radar range-dimensional filtering receiver and method. Background Technology

[0002] Radar is a device that uses electromagnetic waves to detect targets. It transmits electromagnetic 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. However, traditional radar is limited by the bandwidth of its electronic components, making it difficult to achieve high-resolution detection by transmitting and receiving wide-bandwidth signals. Microwave photonic radar, based on optoelectronic devices to generate, transmit, and process high-frequency wideband radar signals, can support high-resolution, high-precision radar detection systems and represents a potential future direction for high-resolution radar development.

[0003] However, high-frequency broadband radar often encounters numerous non-ideal interference signals in applications. Typical examples of interference include cloud and bird clutter from sounding radar, and wall and environmental clutter from through-wall radar. This type of interference typically shares the same frequency band, waveform, and angle of arrival as the target echo, making it difficult to eliminate using traditional filtering techniques such as frequency domain filtering and spatial domain filtering (beamforming). Therefore, it is necessary to suppress these broadband interferences from a range perspective.

[0004] In the digital domain, matching filtering combined with digital signal processing of the obtained high-resolution one-dimensional image of the target can achieve range-dimensional filtering. However, this approach, based on matched filtering, requires an ADC (Analog-to-Digital Converter) with bandwidth matching the signal bandwidth, making it unsuitable for broadband radar. Time-domain gating suppresses interference by windowing the target echo at the receiver; however, broadband radars often use modulated pulses, leading to overlap between the target echo and interference components in the time domain. Time-domain gating suppresses both the echo and interference signals, degrading the signal-to-noise ratio (SNR). Frequency diversity arrays possess scanning beam patterns, enabling equivalent range-dimensional filtering; however, this beam scanning characteristic reduces the target's exposure time within the beam, further worsening the SNR. Descrambling methods for linear frequency modulated (LFM) signals can achieve equivalent range-dimensional filtering by adjusting the reference signal delay; however, limited by receiver bandwidth, this approach has a narrow filtering range and severely degrades the SNR for distant targets.

[0005] In summary, existing range-based filtering techniques have a significant impact on the signal-to-noise ratio of the target echo and a narrow filtering range, which urgently needs to be addressed. Summary of the Invention

[0006] This application provides a microwave photonic broadband radar range-dimensional filtering receiving device and method to solve the problems of existing range-dimensional filtering technology having a significant impact on the target echo signal-to-noise ratio and a narrow filtering range.

[0007] The first aspect of this application provides a microwave photonic broadband radar range-dimensional filtering receiver, comprising: a signal generation module for generating a multi-component swept frequency signal and receiving a target echo signal transmitted by a target radar; a hardware processing module for performing bandwidth compression on the target echo signal based on the multi-component swept frequency signal to obtain an intermediate frequency compressed signal corresponding to the target echo signal; and a signal conversion module for performing sampling and quantization on the intermediate frequency compressed signal to obtain a digital signal corresponding to the intermediate frequency compressed signal, and generating a broadband signal range-dimensional filtering result based on the digital signal.

[0008] Optionally, in one embodiment of this application, the signal generation module includes: an echo signal receiving unit for receiving the target echo signal; and a multi-component sweep frequency signal generation unit for generating the multi-component sweep frequency signal.

[0009] Optionally, in one embodiment of this application, the hardware processing module includes: an electro-optic conversion unit, used to perform electro-optic conversion modulation on the target echo signal to obtain an optical domain echo signal; a photoelectric conversion unit, used to perform photoelectric conversion modulation on the optical domain echo signal to obtain a microwave domain echo signal, and perform time-frequency two-dimensional signal processing on the microwave domain echo signal based on the multi-component sweep frequency signal to generate the intermediate frequency signal; and a low-pass filtering unit, used to extract the target low-frequency portion of the intermediate frequency signal to obtain the intermediate frequency compressed signal.

[0010] Optionally, in one embodiment of this application, the signal conversion module includes: an analog-to-digital converter, used to perform a sampling operation on the intermediate frequency compressed signal to obtain an intermediate frequency compressed signal sample, and to perform quantization processing on the intermediate frequency compressed signal sample to obtain the digital signal; and a filtering unit, used to filter the digital signal using a preset time-frequency two-dimensional matched filtering algorithm to obtain the wideband signal distance dimension filtering result.

[0011] A second aspect of this application provides a microwave photonic broadband radar range-dimensional filtering reception method, comprising the following steps: generating a multi-component swept frequency signal and receiving a target echo signal transmitted by a target radar; performing bandwidth compression on the target echo signal based on the multi-component swept frequency signal to obtain an intermediate frequency compressed signal corresponding to the target echo signal; performing sampling and quantization on the intermediate frequency compressed signal to obtain a digital signal corresponding to the intermediate frequency compressed signal, and generating a broadband signal range-dimensional filtering result based on the digital signal.

[0012] Optionally, in one embodiment of this application, the step of performing bandwidth compression on the target echo signal based on the multi-component swept frequency signal to obtain the intermediate frequency compressed signal corresponding to the target echo signal includes: performing electro-optic conversion modulation on the target 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 time-frequency two-dimensional signal processing on the microwave domain echo signal based on the multi-component swept frequency signal to generate the intermediate frequency signal; and extracting the target low-frequency portion of the intermediate frequency signal to obtain the intermediate frequency compressed signal.

[0013] Optionally, in one embodiment of this application, the step of performing sampling and quantization operations on the intermediate frequency compressed signal to obtain the digital signal corresponding to the intermediate frequency compressed signal includes: performing a sampling operation on the intermediate frequency compressed signal to obtain intermediate frequency compressed signal samples, and performing quantization processing on the intermediate frequency compressed signal samples to obtain the digital signal.

[0014] Optionally, in one embodiment of this application, generating a wideband signal distance dimension filtering result based on the digital signal includes: filtering the digital signal using a preset time-frequency two-dimensional matched filtering algorithm to obtain the wideband signal distance dimension filtering result.

[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 microwave photonic broadband radar range-dimensional filtering reception 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 microwave photonic broadband radar range-dimensional filtering reception method described above.

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

[0018] Embodiments of this application include a signal generation module for generating a multi-component swept frequency signal and receiving target echo signals transmitted by a target radar; a hardware processing module for performing bandwidth compression on the target echo signal based on the multi-component swept frequency signal to obtain an intermediate frequency compressed signal corresponding to the target echo signal; and a signal conversion module for performing sampling and quantization on the intermediate frequency compressed signal to obtain a digital signal corresponding to the intermediate frequency compressed signal, and generating a wideband signal range-dimensional filtering result based on the digital signal. This application effectively improves the filtering range and reduces the impact on the target echo by utilizing the large time window and time-frequency two-dimensional characteristics of the multi-component swept frequency signal. Therefore, it solves the problems of existing range-dimensional filtering techniques having a significant impact on the target echo signal-to-noise ratio and a narrow filtering range.

[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 microwave photonic broadband radar range-dimensional filtering receiver provided according to an embodiment of this application;

[0022] Figure 2 A time-frequency diagram of a multi-component swept frequency signal is provided as an embodiment of this application;

[0023] Figure 3 A schematic diagram of a hardware processing module provided in one embodiment of this application;

[0024] Figure 4 A schematic diagram of the logic architecture of a microwave photonic broadband radar range-dimensional filtering receiver is provided for one embodiment of this application;

[0025] Figure 5 A schematic diagram of one-dimensional distance imaging results of six point targets and two interferences provided for a specific embodiment of this application;

[0026] Figure 6 A time-frequency diagram of a multi-component swept frequency signal provided for a specific embodiment of this application;

[0027] Figure 7 A time-frequency diagram of an intermediate frequency signal after multi-component sweep frequency signal processing of echo and interference is provided as a specific embodiment of this application;

[0028] Figure 8A schematic diagram of a one-dimensional distance imaging result for a six-point target is provided as a specific embodiment of this application;

[0029] Figure 9 This is a flowchart of a microwave photonic broadband radar range-dimensional filtering and receiving method according to an embodiment of this application;

[0030] Figure 10 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application.

[0031] Among them, 10-microwave photonic broadband radar range-dimensional filtering receiver, 100-signal generation module, 200-hardware processing module, 300-signal conversion module, 1001-memory, 1002-processor, and 1003-communication interface. Detailed Implementation

[0032] 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.

[0033] The microwave photonic broadband radar range-dimensional filtering receiving device and method according to embodiments of this application are described below with reference to the accompanying drawings. Addressing the problems mentioned in the background art, this application provides a microwave photonic broadband radar range-dimensional filtering receiving device, comprising: a signal generation module for generating a multi-component swept frequency signal and receiving a target echo signal transmitted by a target radar; a hardware processing module for performing bandwidth compression on the target echo signal based on the multi-component swept frequency signal to obtain an intermediate frequency compressed signal corresponding to the target echo signal; and a signal conversion module for performing sampling and quantization operations on the intermediate frequency compressed signal to obtain a digital signal corresponding to the intermediate frequency compressed signal, and generating a broadband signal range-dimensional filtering result based on the digital signal. This application effectively improves the filtering range and reduces the impact on the target echo by utilizing the large time window and time-frequency two-dimensional characteristics of the multi-component swept frequency signal. Thus, it solves the problems of existing range-dimensional filtering techniques having a significant impact on the signal-to-noise ratio of the target echo and a narrow filtering range.

[0034] Specifically, Figure 1 This is a block diagram of a microwave photonic broadband radar range-dimensional filtering receiver according to an embodiment of this application.

[0035] like Figure 1 As shown, the microwave photonic broadband radar range-dimensional filtering receiver 10 includes: a signal generation module 100, a hardware processing module 200, and a signal conversion module 300.

[0036] The signal generation module 100 is used to generate multi-component frequency sweep signals and receive target echo signals sent by the target radar.

[0037] The embodiments of this application first generate a multi-component swept frequency signal through a signal generation module and receive the echo signal sent by the radar, thereby providing reliable data support for the time-frequency two-dimensional signal processing of the echo signal.

[0038] Optionally, in one embodiment of this application, the signal generation module 100 includes: an echo signal receiving unit and a multi-component sweep frequency signal generation unit.

[0039] The echo signal receiving unit is used to receive the target echo signal.

[0040] A multi-component sweep frequency signal generation unit is used to generate multi-component sweep frequency signals.

[0041] It should be noted that, in the embodiments of this application, the echo signal receiving module mainly includes two parts: an echo signal receiving unit and a multi-component sweep frequency signal generation unit.

[0042] In actual implementation, embodiments of this application can receive echo signals through an echo signal receiving unit and transmit the signals to subsequent hardware processing modules (i.e., real-time two-dimensional signal hardware processing modules); in addition, multi-component swept frequency signals can be generated using a multi-component swept frequency signal generation unit. The center wavelength of these multi-component swept frequency signals should fall within the operating wavelength range of the subsequent electro-optic conversion unit, such as... Figure 2 As shown, the output of the multi-component sweep frequency signal generation unit is connected to the input of the subsequent electro-optic conversion unit to send the multi-component sweep frequency signal to the time-frequency two-dimensional signal hardware processing module.

[0043] Therefore, the embodiments of this application can receive echo signals and generate multi-component sweep frequency signals through an echo signal receiving unit and a multi-component sweep frequency signal generation unit, thereby providing reliable technical support for achieving range-dimensional filtering and interference suppression.

[0044] The hardware processing module 200 is used to perform bandwidth compression on the target echo signal based on the multi-component frequency sweep signal to obtain the intermediate frequency compressed signal corresponding to the target echo signal.

[0045] After obtaining the echo signal and multi-component swept frequency signal through the signal generation module, the embodiments of this application can further use the hardware processing module (i.e., the real-time two-dimensional signal hardware processing module) to perform corresponding modulation processing and bandwidth compression operations on the echo signal based on the multi-component swept frequency signal, thereby generating the intermediate frequency compressed signal corresponding to the echo signal.

[0046] Optionally, in one embodiment of this application, the hardware processing module 200 includes: an electro-optical conversion unit, a photoelectric conversion unit, and a low-pass filter unit.

[0047] Among them, the electro-optic conversion unit is used to perform electro-optic conversion modulation on the target 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 time-frequency two-dimensional signal processing on the microwave domain echo signal based on the multi-component sweep frequency signal to generate the intermediate frequency signal.

[0049] The low-pass filter unit is used to extract the target low-frequency portion of the intermediate frequency signal to obtain the intermediate frequency compressed signal.

[0050] It should be noted that the hardware processing module in this embodiment mainly includes three parts: an electro-optical conversion unit, a photoelectric conversion unit, and a low-pass filter unit, such as... Figure 3 As shown.

[0051] Specifically, the aforementioned electro-optic conversion unit mainly includes an electro-optic modulator, which can modulate the echo signal from the microwave domain to the optical domain to obtain an optical domain echo signal, and its output is connected to the photoelectric conversion unit.

[0052] The aforementioned photoelectric conversion unit includes a photodetector, which is mainly used to convert optical domain echo signals into microwave domain echo signals, and at the same time realize time-frequency two-dimensional signal processing based on multi-component swept frequency signals. Its output is connected to a low-pass filter unit. In addition, the low-pass filter unit has a bandwidth of B, which can be used to select the low-frequency part of the input intermediate frequency signal, thereby realizing bandwidth compression.

[0053] It should be noted that, in the embodiments of this application, the response bandwidth of the electro-optic modulator is greater than the highest frequency of the broadband echo, and the response bandwidth of the photodetector is greater than the receiver bandwidth setting value B.

[0054] Therefore, the embodiments of this application construct a microwave photonic link based on optoelectronic devices such as electro-optic modulators and photodetectors, and utilize the nonlinear effects of the devices to modulate a multi-component linear frequency modulation reference signal to perform time-frequency two-dimensional signal processing on broadband radar echo signals, thereby effectively ensuring the realization of range-dimensional filtering and interference suppression.

[0055] The signal conversion module 300 is used to perform sampling and quantization operations on the intermediate frequency compressed signal to obtain the digital signal corresponding to the intermediate frequency compressed signal, and generate a wideband signal distance dimension filtering result based on the digital signal.

[0056] After the hardware processing module outputs the intermediate frequency compressed signal, the embodiments of this application can sample and quantize the intermediate frequency compressed signal to obtain the digital signal corresponding to the intermediate frequency compressed signal, thereby using the digital signal and a preset filtering algorithm to generate a wideband signal distance dimension filtering result.

[0057] Optionally, in one embodiment of this application, the signal conversion module 300 includes an analog-to-digital converter and a filtering unit.

[0058] The analog-to-digital converter is used to perform sampling operations on the intermediate frequency (IF) compressed signal to obtain IF compressed signal samples, and to quantize the IF compressed signal samples to obtain digital signals.

[0059] The filtering unit is used to filter digital signals using a preset time-frequency two-dimensional matched filtering algorithm to obtain wideband signal distance-dimensional filtering results.

[0060] In the embodiments of this application, the signal conversion module described above may consist of an analog-to-digital converter and a filtering unit, such as... Figure 4 As shown.

[0061] In one possible approach, embodiments of this application can sample the input intermediate frequency (IF) compressed signal using an analog-to-digital converter (ADC) to obtain IF compressed signal samples, and then quantize the obtained IF compressed signal samples to obtain a digital signal. Furthermore, embodiments of this application can input the sampled and quantized digital signal into a preset time-frequency two-dimensional matched filtering algorithm using a filtering unit to output a wideband signal distance dimension filtering result.

[0062] In summary, the embodiments of this application develop a microwave photonic time-frequency two-dimensional signal processing theory based on multi-component swept frequency signals. By constructing and modulating multi-component linear frequency-modulated reference signals in the optical domain, and combining the nonlinear effects of electro-optic modulators and photodetectors, the received broadband radar echo signals are processed and modulated in the optical domain in a time-frequency two-dimensional manner, thereby achieving range-dimensional filtering and eliminating the influence of interference signals on radar receivers and radar detection. Furthermore, this application utilizes the large time window and time-frequency two-dimensional characteristics of multi-component swept frequency signals, resulting in a large filtering range and minimal impact on target echoes.

[0063] The execution logic and performance of the microwave photonic broadband radar range-dimensional filtering receiver of this application will be described and introduced below through a specific embodiment and in conjunction with the accompanying drawings.

[0064] In one specific embodiment of this application, six point targets and two interferences may be set. The six point targets are located at relative radar distances of 1663.49m, 1791.53m, 3051.39m, 3090.10m, 10088.61m, and 10690.84m, respectively. The two interfering targets are located at 6566.59m and 11511.49m. The transmitted signal is a linear frequency modulated (LFM) signal of 8-11.8GHz, with a duration Tr = 20μs, a period T = 100μs, and a bandwidth of 3.8GHz, corresponding to an unambiguous range of 15km. The receiver bandwidth is set to B = 475MHz, and the frequency band range and chirp rate of the multi-component swept frequency signal are set to be consistent with the transmitted signal. The multi-component swept frequency signal consists of four LFM components with delays of 15µs, 25µs, 70µs, and 75µs, corresponding to filter area centers of 2.25, 3.75, 10.5, and 11.25km, respectively, and a filter area size of 750m.

[0065] Figure 5 This is a schematic diagram of the one-dimensional distance imaging results between six point targets and two interfering factors. Figure 6 This is the time-frequency plot of a multi-component swept frequency signal. Figure 7 The time-frequency diagram of the intermediate frequency signal after multi-component sweep frequency signal processing, including echoes and interference, is given by... Figures 5-7 It can be seen that the signal receiving bandwidth is compressed to 475MHz, indicating that the interference located at 6566.59m and 11511.49m is filtered out, and the target is unaffected; after the output signal is processed by the time-frequency two-dimensional matched filtering algorithm, the one-dimensional range image of the six point targets is as follows: Figure 8 As shown, by Figure 8 It is understood that the microwave photonic broadband radar range-dimensional filtering receiver of this application can effectively achieve range-dimensional filtering while ensuring that the target signal is not affected.

[0066] The microwave photonic broadband radar range-dimensional filtering receiver proposed in this application includes a signal generation module for generating a multi-component swept frequency signal and receiving a target echo signal transmitted by a target radar; a hardware processing module for performing bandwidth compression on the target echo signal based on the multi-component swept frequency signal to obtain an intermediate frequency compressed signal corresponding to the target echo signal; and a signal conversion module for performing sampling and quantization on the intermediate frequency compressed signal to obtain a digital signal corresponding to the intermediate frequency compressed signal, and generating a broadband signal range-dimensional filtering result based on the digital signal. This application effectively improves the filtering range and reduces the impact on the target echo by utilizing the large time window and time-frequency two-dimensional characteristics of the multi-component swept frequency signal.

[0067] Secondly, the microwave photonic broadband radar range-dimensional filtering and receiving method proposed according to the embodiments of this application is described with reference to the accompanying drawings.

[0068] Figure 9This is a flowchart of a microwave photonic broadband radar range-dimensional filtering and receiving method provided in an embodiment of this application.

[0069] like Figure 9 As shown, the microwave photonic broadband radar range-dimensional filtering and receiving method includes the following steps:

[0070] In step S901, a multi-component frequency sweep signal is generated, and the target echo signal sent by the target radar is received.

[0071] In step S902, based on the multi-component frequency sweep signal, the bandwidth compression operation is performed on the target echo signal to obtain the intermediate frequency compressed signal corresponding to the target echo signal.

[0072] In step S903, the intermediate frequency compressed signal is sampled and quantized to obtain the digital signal corresponding to the intermediate frequency compressed signal, and the broadband signal distance dimension filtering result is generated based on the digital signal.

[0073] Optionally, in one embodiment of this application, bandwidth compression is performed on the target echo signal based on a multi-component swept frequency signal to obtain an intermediate frequency compressed signal corresponding to the target echo signal. This includes: performing electro-optic conversion modulation on the target 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 time-frequency two-dimensional signal processing on the microwave domain echo signal based on the multi-component swept frequency signal to generate an intermediate frequency signal; and extracting the target low-frequency portion of the intermediate frequency signal to obtain the intermediate frequency compressed signal.

[0074] Optionally, in one embodiment of this application, performing sampling and quantization operations on the intermediate frequency compressed signal to obtain a digital signal corresponding to the intermediate frequency compressed signal includes: performing a sampling operation on the intermediate frequency compressed signal to obtain an intermediate frequency compressed signal sample, and performing quantization processing on the intermediate frequency compressed signal sample to obtain a digital signal.

[0075] Optionally, in one embodiment of this application, generating a broadband signal range dimension filtering result based on a digital signal includes: filtering the digital signal using a preset time-frequency two-dimensional matched filtering algorithm to obtain the broadband signal range dimension filtering result.

[0076] It should be noted that the foregoing explanation of the microwave photonic broadband radar range-dimensional filtering receiver embodiment also applies to the microwave photonic broadband radar range-dimensional filtering receiver method of this embodiment, and will not be repeated here.

[0077] The microwave photonic broadband radar range-dimensional filtering and receiving method proposed in this application generates a multi-component swept frequency signal and receives the target echo signal transmitted by the target radar. Based on the multi-component swept frequency signal, a bandwidth compression operation is performed on the target echo signal to obtain an intermediate frequency compressed signal corresponding to the target echo signal. The intermediate frequency compressed signal is then sampled and quantized to obtain a digital signal corresponding to the intermediate frequency compressed signal, and a broadband signal range-dimensional filtering result is generated based on the digital signal. This application effectively improves the filtering range and reduces the impact on the target echo by utilizing the large time window and time-frequency two-dimensional characteristics of the multi-component swept frequency signal.

[0078] Figure 10 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 1001, the processor 1002, and the computer program stored on the memory 1001 and capable of running on the processor 1002.

[0080] When the processor 1002 executes the program, it implements the microwave photonic broadband radar range-dimensional filtering and receiving method provided in the above embodiments.

[0081] Furthermore, electronic devices also include:

[0082] Communication interface 1003 is used for communication between memory 1001 and processor 1002.

[0083] The memory 1001 is used to store computer programs that can run on the processor 1002.

[0084] The memory 1001 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 1001, processor 1002, and communication interface 1003 are implemented independently, then the communication interface 1003, memory 1001, and processor 1002 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 into address buses, data buses, control buses, etc. For ease of representation, Figure 10 The 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 1001, processor 1002, and communication interface 1003 are integrated on a single chip, then the memory 1001, processor 1002, and communication interface 1003 can communicate with each other through an internal interface.

[0087] The processor 1002 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 microwave photonic broadband radar range-dimensional filtering reception method described above.

[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 microwave photonic broadband radar range-dimensional filtering receiver, characterized in that, include: The signal generation module is used to generate multi-component frequency sweep signals and receive target echo signals sent by the target radar. The hardware processing module is used to perform bandwidth compression operation on the target echo signal based on the multi-component sweep frequency signal to obtain the intermediate frequency compressed signal corresponding to the target echo signal. The signal conversion module is used to perform sampling and quantization operations on the intermediate frequency compressed signal to obtain the digital signal corresponding to the intermediate frequency compressed signal, and generate a wideband signal distance dimension filtering result based on the digital signal; The hardware processing module includes: An electro-optic conversion unit is used to perform electro-optic conversion modulation on the target 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 time-frequency two-dimensional signal processing on the microwave domain echo signal based on the multi-component sweep frequency signal to generate an intermediate frequency signal. A low-pass filter unit is used to extract the target low-frequency portion of the intermediate frequency signal to obtain the intermediate frequency compressed signal; The signal conversion module includes: An analog-to-digital converter is used to perform a sampling operation on the intermediate frequency compressed signal to obtain an intermediate frequency compressed signal sample, and to perform quantization processing on the intermediate frequency compressed signal sample to obtain the digital signal; The filtering unit is used to filter the digital signal using a preset time-frequency two-dimensional matched filtering algorithm to obtain the distance dimension filtering result of the broadband signal.

2. The apparatus according to claim 1, characterized in that, The signal generation module includes: An echo signal receiving unit is used to receive the target echo signal; A multi-component sweep frequency signal generation unit is used to generate the multi-component sweep frequency signal.

3. A microwave photonic broadband radar range-dimensional filtering and receiving method, characterized in that, Includes the following steps: Generate multi-component frequency sweep signals and receive target echo signals sent by the target radar; Based on the multi-component swept frequency signal, a bandwidth compression operation is performed on the target echo signal to obtain the intermediate frequency compressed signal corresponding to the target echo signal. The intermediate frequency compressed signal is sampled and quantized to obtain the digital signal corresponding to the intermediate frequency compressed signal, and a wideband signal distance dimension filtering result is generated based on the digital signal. The step of performing bandwidth compression on the target echo signal based on the multi-component swept frequency signal to obtain the intermediate frequency compressed signal corresponding to the target echo signal includes: The target echo signal is electro-optically converted and modulated to obtain an optical echo signal; The optical domain echo signal is photoelectrically converted and modulated to obtain a microwave domain echo signal. Based on the multi-component sweep frequency signal, the microwave domain echo signal is subjected to time-frequency two-dimensional signal processing to generate an intermediate frequency signal. Extract the target low-frequency portion of the intermediate frequency signal to obtain the intermediate frequency compressed signal; The step of sampling and quantizing the intermediate frequency compressed signal to obtain the corresponding digital signal includes: A sampling operation is performed on the intermediate frequency compressed signal to obtain an intermediate frequency compressed signal sample, and the intermediate frequency compressed signal sample is quantized to obtain the digital signal; The step of generating a wideband signal range-dimensional filtering result based on the digital signal includes: The digital signal is filtered by a preset time-frequency two-dimensional matched filtering algorithm to obtain the distance dimension filtering result of the broadband signal.

4. An electronic device, characterized in that, include: The system includes 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 microwave photonic broadband radar range-dimensional filtering reception method as described in claim 3.

5. A computer-readable storage medium having a computer program stored thereon, characterized in that, The program is executed by the processor to implement the microwave photonic broadband radar range-dimensional filtering reception method as described in claim 3.

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