Microwave photon wideband radar large distance range detection device and method

Abstract

The application relates to a microwave photon wideband radar large-distance range detection device and method, which comprises the following modules: a signal generation module, which is used for generating a multi-component linear frequency modulation signal and receiving a target echo signal sent 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 linear frequency modulation 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 target distance range detection result according to the digital signal. Therefore, the problems that the traditional radar detection distance range and resolution are mutually restricted, the system structure of the existing multi-channel technology is relatively complex, and channel consistency is poor are solved.

Description

Technical Field

[0001] This application relates to the field of radar technology, and in particular to a microwave photonic broadband radar long-range detection device 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. Traditional radar, limited by the bandwidth of its electronic components, struggles to achieve high-resolution detection by transmitting and receiving wide-bandwidth signals. Microwave photonic radar, based on optoelectronic devices to generate, transmit, and process wideband radar signals, can support high-resolution, high-precision radar detection systems and represents a potential future direction for high-resolution radar development.

[0003] With the increasing complexity of detection scenarios, the demand for simultaneous high-resolution detection of multiple targets distributed within the coverage range of a single radar beam—that is, high-resolution detection over a large range—is growing. Traditional matched-filter pulse compression can achieve large-range detection; however, the processing bandwidth required for matched-filter pulse compression is the same as the signal bandwidth, posing difficulties for subsequent ADC (Analog-to-Digital Converter) and signal processing, making it unsuitable for high-resolution, large-range detection. Traditional de-skewing broadband radar receiving methods are limited by receiver bandwidth, resulting in a narrow detection range. Existing methods that adjust the de-skewing reference signal delay can only control the high-resolution detection position, not the range size. Furthermore, existing high-resolution, large-range detection schemes utilize time-division or frequency-band multiplexing strategies to construct multiple narrow-range receiving channels to jointly achieve an equivalent large-range reception; however, these schemes suffer from complex system structures and poor channel consistency.

[0004] In summary, the detection range and resolution of traditional radars are mutually constrained, while the existing multi-channel technology has a relatively complex system structure and poor channel consistency, which urgently needs to be addressed. Summary of the Invention

[0005] This application provides a microwave photonic broadband radar long-range detection device and method to solve the problems of the mutual constraint between the detection range and resolution of traditional radar, and the relatively complex system structure and poor channel consistency of existing multi-channel technologies.

[0006] The first aspect of this application provides a microwave photonic broadband radar long-range detection device, comprising: a signal generation module for generating a multi-component linear frequency modulated 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 linear frequency modulated 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 target range detection result based on the digital signal.

[0007] 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 frequency modulation signal generation unit for generating the multi-component linear frequency modulation signal.

[0008] Optionally, in one embodiment of this application, the hardware processing module includes: an electro-optic conversion unit for performing electro-optic conversion modulation on the target echo signal to obtain an optical domain echo signal; a photoelectric conversion unit for 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 linear frequency modulated signal to generate the intermediate frequency signal; and a low-pass filtering unit for extracting the target low-frequency portion of the intermediate frequency signal to obtain the intermediate frequency compressed signal.

[0009] 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 quantize the intermediate frequency compressed signal sample to generate 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 broadband signal target distance range detection result.

[0010] A second aspect of this application provides a method for long-range detection using microwave photonic broadband radar, comprising the following steps: generating a multi-component linear frequency modulated 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 linear frequency modulated 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 target range detection result based on the digital signal.

[0011] Optionally, in one embodiment of this application, the step of performing bandwidth compression on the target echo signal based on the multi-component linear frequency modulated 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 linear frequency modulated 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.

[0012] 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 generate the digital signal.

[0013] Optionally, in one embodiment of this application, generating a broadband signal target distance range detection result based on the digital signal includes: filtering the digital signal using a preset time-frequency two-dimensional matched filtering algorithm to obtain the broadband signal target distance range detection result.

[0014] 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 long-range detection method as described in the above embodiments.

[0015] 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 microwave photonic broadband radar long-range detection method.

[0016] Therefore, the embodiments of this application have the following beneficial effects:

[0017] Embodiments of this application include a signal generation module for generating a multi-component linear frequency modulated (LFM) 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 LFM signal to obtain an intermediate frequency (IF) compressed signal corresponding to the target echo signal; and a signal conversion module for performing sampling and quantization on the IF compressed signal to obtain a digital signal corresponding to the IF compressed signal, and generating a broadband target range detection result based on the digital signal. This application effectively achieves high-resolution reception and detection of broadband echoes over a large range by utilizing the large time window and two-dimensional time-frequency characteristics of the two-dimensional time-frequency signal, greatly simplifying the system structure and optimizing the system's channel consistency. This solves the problems of the traditional radar detection range and resolution being mutually constrained, and the existing multi-channel technology having a complex system structure and poor channel consistency.

[0018] 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

[0019] 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:

[0020] Figure 1 This is an example diagram of a microwave photonic broadband radar long-range detection device provided according to an embodiment of this application;

[0021] Figure 2 A schematic diagram of the logic architecture of a microwave photonic broadband radar long-range detection device provided in one embodiment of this application;

[0022] Figure 3 A time-frequency diagram of a multi-component linear frequency modulated signal is provided as an embodiment of this application;

[0023] Figure 4 A schematic diagram of a hardware processing module structure is provided for one embodiment of this application;

[0024] Figure 5 A time-frequency diagram of an intermediate frequency signal of an eight-point target echo after multi-component linear frequency modulation signal processing is provided as a specific embodiment of this application;

[0025] Figure 6 A schematic diagram of a one-dimensional distance imaging result for eight point targets is provided as a specific embodiment of this application;

[0026] Figure 7 This is a flowchart of a microwave photonic broadband radar long-range detection method according to an embodiment of this application;

[0027] Figure 8 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application.

[0028] Among them, 10-microwave photonic broadband radar long-range detection device, 100-signal generation module, 200-hardware processing module, 300-signal conversion module, 801-memory, 802-processor, and 803-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 description, with reference to the accompanying drawings, describes a microwave photonic broadband radar long-range detection device and method according to embodiments of this application. Addressing the problems mentioned in the background section, this application provides a microwave photonic broadband radar long-range detection device, comprising: a signal generation module for generating a multi-component linear frequency modulated (LFM) 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 LFM signal to obtain an intermediate frequency (IF) compressed signal corresponding to the target echo signal; and a signal conversion module for performing sampling and quantization on the IF compressed signal to obtain a digital signal corresponding to the IF compressed signal, and generating a broadband signal target range detection result based on the digital signal. This application effectively achieves high-resolution reception and detection of broadband echoes over a long range by utilizing the large time window and time-frequency two-dimensional characteristics of the signal, greatly simplifying the system structure and optimizing the system's channel consistency. Thus, it solves the problems of the mutual constraint between the detection range and resolution of traditional radars, and the relatively complex system structure and poor channel consistency of existing multi-channel technologies.

[0031] Specifically, Figure 1 This is a block diagram of a microwave photonic broadband radar long-range detection device according to an embodiment of this application.

[0032] like Figure 1 As shown, the microwave photonic broadband radar long-range detection device 10 includes: a signal generation module 100, a hardware processing module 200, and a signal conversion module 300.

[0033] The signal generation module 100 is used to generate multi-component linear frequency modulated signals and receive target echo signals sent by the target radar.

[0034] 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.

[0035] Optionally, in one embodiment of this application, the signal generation module 100 includes an echo signal receiving unit and a frequency modulation signal generation unit.

[0036] The echo signal receiving unit is used to receive the target echo signal.

[0037] The frequency modulation signal generation unit is used to generate multi-component linear frequency modulation signals.

[0038] In the embodiments of this application, the signal generation module includes two parts: an echo signal receiving unit and an FM signal generation unit.

[0039] It should be noted that the embodiments of this application can utilize an echo signal receiving unit to receive the target echo signal and send the target echo signal to a subsequent hardware processing module (i.e., a real-time two-dimensional signal hardware processing module), such as... Figure 2 As shown; in addition, a multi-component linear frequency modulation (LFM) signal can be generated by a frequency modulation signal generation unit (i.e., a multi-component linear frequency modulation signal generation unit) and transmitted to the time-frequency two-dimensional signal hardware processing module. Among these, Figure 3 The time-frequency diagram of a multi-component linear frequency modulated signal is given by... Figure 3 It can be seen that the minimum frequency spacing between adjacent linear frequency modulated signals is 2B.

[0040] Therefore, the embodiments of this application receive the target echo signal and generate a multi-component linear frequency modulated signal through an echo signal receiving unit and a frequency modulation signal generation unit, thereby providing reliable data guidance and basis for the realization of high-resolution reception and detection of broadband echo over a long distance.

[0041] The hardware processing module 200 is used to perform bandwidth compression on the target echo signal based on the multi-component linear frequency modulated signal to obtain the intermediate frequency compressed signal corresponding to the target echo signal.

[0042] After receiving the target echo signal and generating a multi-component linear frequency modulated signal through the signal generation module, the embodiments of this application can further utilize a hardware processing module (i.e., a two-dimensional frequency signal hardware processing module) to perform corresponding modulation and compression processing on the target echo signal, thereby obtaining a bandwidth-compressed intermediate frequency compressed signal, and sending the intermediate frequency compressed signal to the subsequent analog-to-digital converter.

[0043] 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.

[0044] 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.

[0045] 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 based on the multi-component linear frequency modulation signal, to perform time-frequency two-dimensional signal processing on the microwave domain echo signal to generate an intermediate frequency signal.

[0046] 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.

[0047] The hardware processing module of this application embodiment mainly includes three parts: an electro-optical conversion unit, a photoelectric conversion unit, and a low-pass filter unit. Figure 4 As shown.

[0048] Specifically, in the embodiments of this application, the electro-optic conversion unit includes an electro-optic modulator that can modulate the echo signal from the microwave domain to the optical domain to obtain an optical domain echo signal; the photoelectric conversion unit includes a photodetector that can convert the optical signal (i.e., the optical domain echo signal) into a microwave signal to obtain a microwave domain echo signal, while realizing time-frequency two-dimensional signal processing based on multi-component linear frequency modulated signals; in addition, the low-pass filter unit in the embodiments of this application 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.

[0049] It should be noted that, in the embodiments of this application, 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; the response rate of the photodetector is greater than the receiver bandwidth setting value B, and its output is connected to the low-pass filter unit.

[0050] Therefore, the embodiments of this application construct a multi-component linear frequency modulated signal to perform time-frequency two-dimensional signal processing and modulation on broadband radar echoes, and construct a microwave photonic link based on optoelectronic devices such as electro-optic modulators and photodetectors, while utilizing the nonlinear effects of the devices, thereby realizing time-frequency two-dimensional signal processing.

[0051] 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 the broadband signal target distance range detection result based on the digital signal.

[0052] Following the intermediate frequency compressed signal corresponding to the target echo signal, embodiments of this application can further perform sampling processing and quantization operations on the intermediate frequency compressed signal through a signal conversion module to obtain the digital signal corresponding to the intermediate frequency compressed signal, thereby generating a broadband signal target range detection result based on the digital signal and a preset filtering algorithm.

[0053] Optionally, in one embodiment of this application, the signal conversion module 300 includes an analog-to-digital converter and a filtering unit.

[0054] The analog-to-digital converter (ADC) 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 generate digital signals.

[0055] The filtering unit is used to filter digital signals using a preset time-frequency two-dimensional matched filtering algorithm to obtain the target range detection results of broadband signals.

[0056] In the embodiments of this application, the signal conversion module mainly includes two parts: an analog-to-digital converter and a filtering unit.

[0057] In actual implementation, embodiments of this application can sample the input bandwidth-compressed intermediate frequency (IF) signal using an analog-to-digital converter (ADC) to obtain IF signal samples, and then quantize the IF signal samples to generate a digital signal. The quantized digital signal is then sent to the filtering unit. Subsequently, after receiving the quantized digital signal, the filtering unit of this application can input the digital signal into a preset time-frequency two-dimensional matched filtering algorithm to output a wide-range detection result for a broadband signal.

[0058] In summary, the embodiments of this application construct a multi-component linear frequency modulated signal as a reference signal in the optical domain, utilize its two-dimensional time-frequency characteristics, equivalent large time window characteristics, and the nonlinear effects of electro-optic modulators and photodetectors to perform two-dimensional time-frequency signal processing on the received broadband echo in the optical domain. Combined with subsequent signal processing algorithms, this enables high-resolution reception and detection of broadband radar echoes over a large range. Furthermore, the device of this application has a simple structure, the receiver bandwidth is the same as that of deskewing radar, and the detection range is the same as that of matched filter pulse compression method. It also has the advantages of system simplicity and superior channel consistency, effectively solving the technical problem that radar detection range and resolution cannot be improved simultaneously.

[0059] The following description and explanation, through a specific embodiment and in conjunction with the execution effect of the execution logic of the microwave photonic broadband radar long-range detection device of this application, will introduce and illustrate this application.

[0060] In one specific embodiment of this application, eight point targets can be set, located at relative radar distances of 10690.84m, 11511.49m, 6566.59m, 1663.49m, 1791.53m, 3090.10m, 10088.61m, and 3051.39m, respectively; the transmitted signal is a linear frequency modulated signal of 8-11.8GHz, with a duration Tr = 20μs, a period T = 100μs, a bandwidth of 3.8GHz, and a corresponding unambiguous range of 15km; in addition, in the multi-component linear frequency modulated signal used in this specific embodiment, the frequency interval between adjacent linear frequency modulated signals is 2B = 0.95GHz, the frequency band range is consistent with the transmitted signal, and the receiver bandwidth is set to B = 475MHz.

[0061] Figure 5 The time-frequency diagram of the intermediate frequency signal after multi-component linear frequency modulation signal processing of the echoes from eight point targets is given by... Figure 5 It can be seen that the signal receiving bandwidth is compressed to 475MHz; after the output signal is processed by the time-frequency two-dimensional matched filtering algorithm, the one-dimensional range images of each target are obtained as follows: Figure 6 As shown, by Figure 6 It can be seen that high-resolution imaging was obtained for each point target. Therefore, it can be concluded that the detection range of the microwave photonic broadband radar long-range detection device of this application has reached the same unambiguous range as the traditional matched filter pulse compression method.

[0062] The microwave photonic broadband radar long-range detection device proposed in this application includes a signal generation module for generating a multi-component linear frequency modulated 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 linear frequency modulated 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 target range detection result based on the digital signal. This application utilizes the large time window and time-frequency two-dimensional characteristics of the signal to effectively achieve high-resolution reception and detection of broadband echoes over a long range, greatly simplifying the system structure and optimizing the system's channel consistency.

[0063] Secondly, with reference to the accompanying drawings, a microwave photonic broadband radar method for long-range detection according to embodiments of this application is described.

[0064] Figure 7 This is a flowchart illustrating a microwave photonic broadband radar method for long-range detection provided in an embodiment of this application.

[0065] like Figure 7 As shown, the microwave photonic broadband radar long-range detection method includes the following steps:

[0066] In step S701, a multi-component linear frequency modulated signal is generated, and the target echo signal sent by the target radar is received.

[0067] In step S702, based on the multi-component linear frequency modulated 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.

[0068] In step S703, 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 target distance range detection result is generated based on the digital signal.

[0069] Optionally, in one embodiment of this application, bandwidth compression is performed on the target echo signal based on a multi-component linear frequency modulated 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 linear frequency modulated signal to generate an intermediate frequency signal; and extracting the target low-frequency component of the intermediate frequency signal to obtain the intermediate frequency compressed signal.

[0070] Optionally, in one embodiment of this application, sampling and quantizing the intermediate frequency (IF) compressed signal to obtain a digital signal corresponding to the IF compressed signal includes: performing a sampling operation on the IF compressed signal to obtain IF compressed signal samples, and quantizing the IF compressed signal samples to generate a digital signal.

[0071] Optionally, in one embodiment of this application, generating a broadband signal target range detection 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 target range detection result.

[0072] It should be noted that the foregoing explanation of the embodiment of the microwave photonic broadband radar long-range detection device also applies to the microwave photonic broadband radar long-range detection method of this embodiment, and will not be repeated here.

[0073] The microwave photonic broadband radar long-range detection method proposed in this application generates a multi-component linear frequency modulated (LFM) signal and receives the target echo signal transmitted by the target radar. Based on the LFM signal, bandwidth compression is performed on the target echo signal to obtain an intermediate frequency (IF) compressed signal corresponding to the target echo signal. The IF compressed signal is then sampled and quantized to obtain a digital signal corresponding to the IF compressed signal, and a broadband signal target range detection result is generated based on the digital signal. This application utilizes the large time window and time-frequency two-dimensional characteristics of the signal to effectively achieve high-resolution reception and detection of broadband echoes over a long range, greatly simplifying the system structure and optimizing the system's channel consistency.

[0074] Figure 8 A schematic diagram of the structure of an electronic device provided in an embodiment of this application. The electronic device may include:

[0075] The memory 801, the processor 802, and the computer program stored on the memory 801 and capable of running on the processor 802.

[0076] When the processor 802 executes the program, it implements the microwave photonic broadband radar long-range detection method provided in the above embodiments.

[0077] Furthermore, electronic devices also include:

[0078] Communication interface 803 is used for communication between memory 801 and processor 802.

[0079] The memory 801 is used to store computer programs that can run on the processor 802.

[0080] The memory 801 may include high-speed RAM memory, and may also include non-volatile memory, such as at least one disk storage device.

[0081] If the memory 801, processor 802, and communication interface 803 are implemented independently, then the communication interface 803, memory 801, and processor 802 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 divided into address buses, data buses, control buses, etc. For ease of representation, Figure 8The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0082] Optionally, in a specific implementation, if the memory 801, processor 802, and communication interface 803 are integrated on a single chip, then the memory 801, processor 802, and communication interface 803 can communicate with each other through an internal interface.

[0083] The processor 802 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.

[0084] This application also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the above-described microwave photonic broadband radar long-range detection method.

[0085] 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.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] 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.

[0092] 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 long-range detection device, characterized in that, include: The signal generation module is used to generate multi-component linear frequency modulated 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 linear frequency modulated 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 broadband signal target distance range detection results 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 linear frequency modulated 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 quantize the intermediate frequency compressed signal sample to generate 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 target distance range detection 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 frequency modulation signal generation unit is used to generate the multi-component linear frequency modulation signal.

3. A microwave photonic broadband radar method for long-range detection, characterized in that, Includes the following steps: Generate a multi-component linear frequency modulated signal and receive the target echo signal sent by the target radar; Based on the multi-component linear frequency modulated signal, the target echo signal is subjected to bandwidth compression 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 broadband signal target distance range detection result is generated based on the digital signal. The step of performing bandwidth compression on the target echo signal based on the multi-component linear frequency modulated 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 linear frequency modulated 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 generate the digital signal; The step of generating a broadband signal target range detection 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 target distance range detection 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, wherein the processor executes the program to implement the microwave photonic broadband radar long-range detection 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 long-range detection method as described in claim 3.

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