Method and device for enhancing imaging quality of airborne bistatic SAR (Synthetic Aperture Radar)

Abstract

The invention provides an airborne bistatic SAR imaging quality enhancement method and device, and relates to the technical field of radar imaging, and the method comprises the steps: obtaining the position coordinates of a host radar and a slave radar under a preset coordinate system; wherein the preset coordinate system is established by taking an active scaler used for transmitting and receiving radar signals as a coordinate origin; performing distance pulse pressure processing on the original echo data of the slave radar, and extracting the processed data to obtain a migration curve formed by image column positions; performing error compensation processing on the echo data of the slave radar according to the position coordinates and the migration curve to obtain corrected data; and carrying out azimuth phase-coherent accumulation processing on the correction data to obtain a bistatic SAR image after quality enhancement. According to the scheme, the bistatic SAR imaging quality under an airborne platform can be greatly improved.

Description

Technical Field

[0001] The present invention relates to the field of radar imaging technology, and in particular to an airborne bistatic SAR imaging quality enhancement method and device. Background Art

[0002] Bistatic SAR is a new type of synthetic aperture radar system. Compared with monostatic SAR, it has inherent advantages in concealment and security. Its transmitter and receiver are placed on different flight platforms. Therefore, different flight trajectories form different flight configurations. It can obtain scattering information of objects illuminated and received at different angles, which has great research value for studying the scattering characteristics of the target.

[0003] In the related art, since the bistatic SAR has separate transmission and reception, its transmission and reception use different frequency sources for system timing and timekeeping, which leads to time and phase asynchrony of the transmission and reception signals, and thus makes the imaging quality of the bistatic synthetic aperture radar system low.

[0004] Based on this, there is an urgent need for an airborne bistatic SAR imaging quality enhancement method and device to solve the above technical problems. Summary of the invention

[0005] The embodiment of the present invention provides an airborne bistatic SAR imaging quality enhancement method and device, which can effectively improve the imaging quality of an airborne bistatic synthetic aperture radar system.

[0006] In a first aspect, an embodiment of the present invention provides an airborne bistatic SAR imaging quality enhancement method, comprising:

[0007] Obtaining the position coordinates of the master radar and the slave radar in a preset coordinate system; wherein the preset coordinate system is established with an active calibrator for transmitting and receiving radar signals as a coordinate origin;

[0008] Performing range pulse compression processing on the original echo data of the slave radar, and extracting the processed data to obtain a migration curve consisting of image column positions;

[0009] Perform error compensation processing on the echo data of the slave radar according to the position coordinates and the migration curve to obtain the corrected data;

[0010] Azimuth coherent accumulation processing is performed on the corrected data to obtain a quality-enhanced bistatic SAR image.

[0011] In a second aspect, an embodiment of the present invention further provides an airborne bistatic SAR imaging quality enhancement device, comprising:

[0012] An acquisition module, used to acquire the position coordinates of the master radar and the slave radar in a preset coordinate system; wherein the preset coordinate system is established with an active calibrator for transmitting and receiving radar signals as the coordinate origin;

[0013] The first processing module is used to perform range pulse pressure processing on the original echo data of the slave radar, and extract the processed data to obtain a migration curve composed of image column positions;

[0014] The second processing module is used to perform error compensation processing on the echo data of the slave radar according to the position coordinates and the migration curve to obtain corrected data;

[0015] The third processing module is used to perform azimuth coherent accumulation processing on the corrected data to obtain a quality-enhanced bistatic SAR image.

[0016] In a third aspect, an embodiment of the present invention further provides an electronic device, including a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the method described in any embodiment of this specification is implemented.

[0017] In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium having a computer program stored thereon, which, when executed in a computer, enables the computer to execute the method described in any embodiment of this specification.

[0018] The embodiment of the present invention provides an airborne bistatic SAR imaging quality enhancement method and device, which effectively corrects the synchronization deviation of the bistatic SAR system by accurately measuring the position between the dual-machine radar and the active calibrator, and ensures the initial stability of the imaging quality; and compensates for the phase synchronization problem of the bistatic SAR system by performing phase history analysis after receiving from the slave radar. This method can compensate for the influence of the motion offset of the airborne platform itself on the imaging, greatly improve the bistatic SAR imaging quality under the airborne platform, or improve the success rate of imaging under various bistatic angle configurations, greatly reduce the cost of bistatic SAR testing, and has good application prospects and engineering value. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 is a flow chart of an airborne bistatic SAR imaging quality enhancement method provided by an embodiment of the present invention;

[0021] Figure 2 It is a schematic diagram of a dual-base angle of a master-slave beam provided by an embodiment of the present invention;

[0022] Figure 3 It is a schematic diagram of the relationship between the active calibrator and the master and slave machines provided in one embodiment of the present invention;

[0023] Figure 4 is a bistatic SAR image after range pulse compression processing provided by an embodiment of the present invention;

[0024] Figure 5 is a schematic diagram of the slope distance of a migration curve provided by an embodiment of the present invention;

[0025] Figure 6 is a schematic diagram of a phase curve provided by an embodiment of the present invention;

[0026] Figure 7 is a hardware architecture diagram of an electronic device provided by an embodiment of the present invention;

[0027] Figure 8 It is a structural diagram of an airborne bistatic SAR imaging quality enhancement device provided by one embodiment of the present invention. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0029] As mentioned earlier, the time and frequency synchronization of traditional bistatic SAR relies on a high-precision clock source or a direct transmission channel for time and frequency synchronization between the transmitting and receiving base stations. For airborne platforms, these configurations cannot meet the requirements of normalized low-cost applications, which leads to different phase references between the transmitted and received signals, resulting in time and phase asynchrony of the signals.

[0030] Based on this, the idea of ​​the present invention is to realize the time and phase synchronization error correction of the airborne bistatic transceiver platform by adopting a ground active calibration device. This method can compensate for the influence of the motion offset of the airborne platform itself on the imaging, greatly improving the bistatic SAR imaging quality under the airborne platform and the success rate of imaging under various bistatic angle configurations.

[0031] The specific implementation of the above concept is described below.

[0032] Please refer to Figure 1 The embodiment of the present invention provides an airborne bistatic SAR imaging quality enhancement method, the method comprising:

[0033] Step 100, obtaining the position coordinates of the master radar and the slave radar in a preset coordinate system;

[0034] Step 102, performing range pulse pressure processing on the original echo data of the slave radar, and extracting the processed data to obtain a migration curve composed of image column positions;

[0035] Step 104, performing error compensation processing on the echo data of the slave radar according to the position coordinates and the migration curve to obtain corrected data;

[0036] Step 106, performing azimuth coherent accumulation processing on the corrected data to obtain a quality-enhanced bistatic SAR image.

[0037] In the embodiment of the present invention, the synchronization deviation of the bistatic SAR system is effectively corrected by accurately measuring the position between the bistatic radar and the active calibrator to ensure the initial stability of the imaging quality; the phase history analysis after the slave radar is received is performed to compensate for the phase synchronization problem of the bistatic SAR system. This method can compensate for the influence of the motion offset of the airborne platform itself on the imaging, greatly improve the imaging quality of the bistatic SAR under the airborne platform, or improve the success rate of imaging under various bistatic angle configurations, greatly reduce the cost of the bistatic SAR test, and has a good application prospect and engineering value.

[0038] Described below Figure 1 How the various steps are performed.

[0039] First, for step 100, the position coordinates of the master radar and the slave radar in a preset coordinate system are obtained.

[0040] In the embodiment of the present invention, the preset coordinate system is established with the active calibrator for transmitting and receiving radar signals as the coordinate origin.

[0041] Specifically, the active calibrator includes two antennas for transmission and reception, a power amplifier, an extension line and a battery, and is used as a wide-angle calibration body. One of the two antennas receives the transmitted signal of the dual-base radar host; the other is used for transmission, amplifying and delaying the received signal before sending it out. The delay time is determined according to the length of the clutter echo in the main lobe of the radar host beam. A certain angle is maintained between the two antennas, and the angle is set as follows: Figure 2 Bibasic angle shown.

[0042] Furthermore, if Figure 3As shown in the figure, the two airborne platforms are respectively equipped with the host system and the slave system of the bistatic radar. The host beam center of the bistatic radar keeps tracking the receiving antenna of the active calibrator, and the slave beam center of the bistatic radar keeps tracking the transmitting antenna of the active calibrator. When it is determined that the host system sends a radar signal, on the one hand, the slave radar receives the echo signal scattered back from the ground, and on the other hand, the transmission signal is directly received by the ground active calibrator and delayed, and then transmitted to the slave receiving antenna from another angle through the transmitting antenna. The radar signal received by the slave radar includes both the external ground object echo and the host's transmission signal, and the dual-base time-frequency synchronization error is compensated and calibrated using this signal.

[0043] Furthermore, the local northeast sky coordinate system is established with the location of the active calibrator as the origin. In order to ensure the consistency of the coordinate space, the real-time positions of the master and slave aircraft are also converted to this coordinate system. During the flight of the bistatic SAR, the beams of the master and slave aircraft are respectively aimed at the receiving and transmitting antennas of the active calibrator, that is, the beam illumination point is (0,0,0), the position of the master is (mPe,mPn,mPu), and the position of the slave is (sPe,sPn,sPu).

[0044] Then, for step 102, the original echo data of the slave radar is processed by range pulse pressure, and the processed data is extracted to obtain a migration curve composed of image column positions.

[0045] Specifically, the echo data received from the slave radar is firstly processed by pulse compression in the range direction, such as Figure 4 As shown, this processing compresses the transmitted wide pulse signal into a narrow pulse when it is received through special signal modulation and receiving processing methods; when the signal passes through the matching filter, the stronger the frequency point of the signal, the greater the amplification factor of the filter; the weaker the frequency point of the signal, the smaller the amplification factor of the filter, so that the signal is more concentrated in the time domain, thereby improving the distance resolution and detection performance of the radar.

[0046] Furthermore, the migration curve of the active calibrator is manually selected. Assuming that the column position of the extracted migration curve in the image is x = [x1, x2, x3..., xn], then Figure 5 The slope distance of the migration curve shown is expressed by the following formula:

[0047] R cm =rn+x*dr

[0048] In the formula, R cm is the slope distance of the migration curve; rn is the sampling start value of the slave radar; dr is the sampling interval; x is the column position of the migration curve in the image.

[0049] With respect to step 104, error compensation processing is performed on the echo data of the slave radar according to the position coordinates and the migration curve to obtain corrected data.

[0050] In an embodiment of the present invention, the correction data is specifically obtained through the following steps: obtaining the slant distance and the peak phase value of the migration curve; calculating the sum of the distances between the host radar and the slave radar and the active calibrator according to the position coordinates of the host radar and the slave radar; calculating the time synchronization error and the phase synchronization error of the slave radar echo data according to the slant distance, the peak phase value and the sum of the distances; performing error compensation processing on the slave radar echo data according to the time synchronization error and the phase synchronization error to obtain the correction data.

[0051] Specifically, the slope distance of the curve can be obtained in the process of extracting the migration curve, and then the following formula is used to calculate the slope distance of the curve: Figure 6 The peak phase value of the migration curve shown is:

[0052] ph=unwrap(angle(Src(ta,x)))

[0053] Where ph is the peak phase value; Src(ta,x) is the complex data of the migration curve extracted from the echo signal after range pulse compression processing; ta is the azimuth slow time.

[0054] Furthermore, since the position coordinates of the host and slave are obtained when the coordinate system is established, the distances and R between the host radar and the slave radar and the active calibrator can be directly calculated by the following formula: sm :

[0055]

[0056] Since both the host and the slave use RTK positioning, the position information has a high measurement accuracy, that is, it is used as standard data for subsequent processing. Furthermore, after obtaining the slant range, peak phase value and distance sum, the time synchronization error and phase synchronization error of the slave radar echo data can be calculated. The calculation process includes the following steps: calculating the average value of the difference between the slant range and the distance sum to obtain the time synchronization error of the slave radar echo data; calculating the product of the slant range and the distance sum change value according to the wave number of the slave radar echo data, and subtracting the calculated result from the peak phase value to obtain the phase synchronization error.

[0057] Specifically, the time synchronization error is calculated using the following formula:

[0058] δR=mean(R cm -R sm )

[0059] Where δR is the time synchronization error; Rcm is the slope distance of the migration curve; R sm is the distance sum; mean() is the function for calculating the average value.

[0060] Then, the sampling start value of the slave is corrected according to the time synchronization error to obtain the corrected sampling start value:

[0061] Rn=rn-δR

[0062] Where Rn is the corrected sampling start value.

[0063] Furthermore, the phase synchronization error is a curve that changes with the position of the master and slave machines, and is calculated using the following formula:

[0064]

[0065] Where Δph is the phase synchronization error; R sm0 is the initial value of the distance and ; λ is the wavelength of the slave radar echo data.

[0066] After the phase synchronization error is obtained, the phase error compensation can be performed on each frame of slave position data according to the error:

[0067] Src(ta,tao)'=Src(ta,tao)*exp(j*Δph)

[0068] Wherein, Src(ta,tao)' is the echo signal after the modified range pulse pressure processing, that is, the corrected data; Src(ta,tao) is the echo data after the initial range pulse pressure processing.

[0069] Finally, after obtaining the corrected data, the BP neural network algorithm can be used to perform azimuth coherent accumulation processing on the corrected echo data to obtain a focused high-quality bistatic SAR image. It is worth noting that the process of azimuth coherent accumulation processing is well known to those skilled in the art and will not be described in detail here.

[0070] like Figure 7 , Figure 8 As shown, an embodiment of the present invention provides an airborne bistatic SAR imaging quality enhancement device. The device embodiment can be implemented by software, or by hardware or a combination of software and hardware. From the hardware level, Figure 7 As shown, it is a hardware architecture diagram of an electronic device where an airborne bistatic SAR imaging quality enhancement device provided by an embodiment of the present invention is located, except Figure 7 In addition to the processor, memory, network interface, and non-volatile memory shown, the electronic device in the embodiment may also include other hardware, such as a forwarding chip responsible for processing messages, etc. Taking software implementation as an example, Figure 8 As shown, as a device in a logical sense, the CPU of the electronic device in which it is located reads the corresponding computer program in the non-volatile memory into the internal memory and runs it. This embodiment provides an airborne bistatic SAR imaging quality enhancement device, including:

[0071] The acquisition module 800 is used to acquire the position coordinates of the master radar and the slave radar in a preset coordinate system; wherein the preset coordinate system is established with the active calibrator for transmitting and receiving radar signals as the coordinate origin;

[0072] The first processing module 802 is used to perform range pulse pressure processing on the original echo data of the slave radar, and extract the processed data to obtain a migration curve composed of image column positions;

[0073] The second processing module 804 is used to perform error compensation processing on the echo data of the slave radar according to the position coordinates and the migration curve to obtain corrected data;

[0074] The third processing module 806 is used to perform azimuth coherent accumulation processing on the corrected data to obtain a quality-enhanced bistatic SAR image.

[0075] In an embodiment of the present invention, when the second processing module 804 performs error compensation processing on the echo data of the slave radar according to the position coordinates and the migration curve to obtain corrected data, it is specifically used to perform the following operations: obtain the slant distance and the peak phase value of the migration curve; calculate the sum of the distances between the host radar and the slave radar and the active calibrator according to the position coordinates of the host radar and the slave radar; calculate the time synchronization error and the phase synchronization error of the slave radar echo data according to the slant distance, the peak phase value and the sum of the distances; perform error compensation processing on the slave radar echo data according to the time synchronization error and the phase synchronization error to obtain corrected data.

[0076] In the embodiment of the present invention, the slant distance is calculated by the following formula:

[0077] R cm =rn+x*dr

[0078] In the formula, R cm is the slope distance of the migration curve; rn is the sampling start value of the slave radar; dr is the sampling interval; x is the column position of the migration curve in the image.

[0079] In the embodiment of the present invention, the peak phase value is calculated by the following formula:

[0080] ph=unwrap(angle(Src(ta,x)))

[0081] Where ph is the peak phase value; Src(ta,x) is the complex data of the migration curve extracted from the echo signal after range pulse compression processing; ta is the azimuth slow time.

[0082] In an embodiment of the present invention, the time synchronization error and the phase synchronization error of the slave radar echo data are calculated according to the slant range, the peak phase value and the distance sum, including: calculating the average value of the difference between the slant range and the distance sum to obtain the time synchronization error of the slave radar echo data; calculating the product of the slant range and the distance sum change value according to the wave number of the slave radar echo data, and subtracting the calculated result from the peak phase value to obtain the phase synchronization error.

[0083] In the embodiment of the present invention, the time synchronization error and the phase synchronization error are calculated by the following formulas respectively:

[0084] δR=mean(R cm -R sm )

[0085]

[0086] Where δR is the time synchronization error; R cm is the slope distance of the migration curve; R sm is the distance and; Δph is the phase synchronization error; R sm0 is the initial value of the distance and ; λ is the wavelength of the slave radar echo data.

[0087] In the embodiment of the present invention, the correction data is calculated by the following formula:

[0088] Rn=rn-δR

[0089] Src(ta,tao)'=Src(ta,tao)*exp(j*Δph)

[0090] Wherein, Rn is the corrected sampling starting value; Src(ta,tao)' is the echo signal after the corrected range pulse pressure processing; Src(ta,tao) is the echo data after the initial range pulse pressure processing.

[0091] It is to be understood that the structure illustrated in the embodiment of the present invention does not constitute a specific limitation on an airborne bistatic SAR imaging quality enhancement device. In other embodiments of the present invention, an airborne bistatic SAR imaging quality enhancement device may include more or fewer components than shown in the figure, or combine some components, or separate some components, or arrange the components differently. The components shown in the figure may be implemented in hardware, software, or a combination of software and hardware.

[0092] The information interaction, execution process and other contents between the modules in the above-mentioned device are based on the same concept as the embodiment of the method of the present invention. For specific contents, please refer to the description in the embodiment of the method of the present invention, and no further description is given here.

[0093] An embodiment of the present invention further provides an electronic device, including a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, an airborne bistatic SAR imaging quality enhancement method in any embodiment of the present invention is implemented.

[0094] An embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the processor executes an airborne bistatic SAR imaging quality enhancement method in any embodiment of the present invention.

[0095] Specifically, a system or device equipped with a storage medium can be provided, on which software program code that implements the functions of any of the above-mentioned embodiments is stored, and a computer (or CPU or MPU) of the system or device can be enabled to read and execute the program code stored in the storage medium.

[0096] In this case, the program code itself read from the storage medium can realize the function of any one of the above-mentioned embodiments, and thus the program code and the storage medium storing the program code constitute a part of the present invention.

[0097] The storage medium embodiments for providing the program code include a floppy disk, a hard disk, a magneto-optical disk, an optical disk (such as CD-ROM, CD-R, CD-RW, DVD-ROM, DVD-RAM, DVD-RW, DVD+RW), a magnetic tape, a non-volatile memory card, and a ROM. Alternatively, the program code can be downloaded from a server computer by a communication network.

[0098] In addition, it should be clear that the functions of any of the above embodiments can be implemented not only by executing the program code read by the computer, but also by enabling an operating system operating on the computer to complete part or all of the actual operations based on instructions from the program code.

[0099] In addition, it can be understood that the program code read from the storage medium is written to a memory provided in an expansion board inserted into the computer or to a memory provided in an expansion module connected to the computer, and then based on the instructions of the program code, a CPU installed on the expansion board or expansion module is enabled to perform part or all of the actual operations, thereby realizing the functions of any of the above-mentioned embodiments.

[0100] It should be noted that, in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise a ..." do not exclude the presence of other identical factors in the process, method, article or device including the elements.

[0101] A person of ordinary skill in the art can understand that all or part of the steps of implementing the above method embodiments can be completed by hardware related to program instructions, and the aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it executes the steps of the above method embodiments; and the aforementioned storage medium includes: ROM, RAM, magnetic disk or optical disk, etc., various media that can store program codes.

[0102] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for enhancing the quality of airborne bistatic SAR imaging, characterized in that: include: Obtaining the position coordinates of the master radar and the slave radar in a preset coordinate system; wherein the preset coordinate system is established with an active calibrator for transmitting and receiving radar signals as a coordinate origin; Performing range pulse compression processing on the original echo data of the slave radar, and extracting the processed data to obtain a migration curve consisting of image column positions; Perform error compensation processing on the echo data of the slave radar according to the position coordinates and the migration curve to obtain the corrected data; Azimuth coherent accumulation processing is performed on the corrected data to obtain a quality-enhanced bistatic SAR image.

2. The method according to claim 1, characterized in that The error compensation processing is performed on the echo data of the slave radar according to the position coordinates and the migration curve to obtain the corrected data, including: Obtaining the slope distance and peak phase value of the migration curve; According to the position coordinates of the host radar and the slave radar, the sum of the distances between the host radar and the slave radar and the active calibrator is calculated; Calculate the time synchronization error and phase synchronization error of the slave radar echo data according to the slant range, the peak phase value and the distance sum; Error compensation processing is performed on the slave radar echo data according to the time synchronization error and the phase synchronization error to obtain corrected data.

3. The method according to claim 2, characterized in that The slope distance is calculated by the following formula: R cm =rn+x*dr In the formula, R cm is the slope distance of the migration curve; rn is the sampling start value of the slave radar; dr is the sampling interval; x is the column position of the migration curve in the image.

4. The method according to claim 3, characterized in that The peak phase value is calculated by the following formula: ph=unwrap(angle(Src(ta,x))) Where ph is the peak phase value; Src(ta,x) is the complex data of the migration curve extracted from the echo signal after range pulse pressure processing; ta is the position slow time.

5. The method according to claim 2, characterized in that: The step of calculating the time synchronization error and the phase synchronization error of the slave radar echo data according to the slant range, the peak phase value and the distance sum includes: Calculate the average value of the difference between the slant range and the distance sum to obtain the time synchronization error of the slave radar echo data; The product of the slant range, distance and change value is calculated according to the wave number of the slave radar echo data, and the calculated result is subtracted from the peak phase value to obtain the phase synchronization error.

6. The method according to claim 5, characterized in that The time synchronization error and phase synchronization error are calculated by the following formulas respectively: δR=mean(R cm -R sm ) Where δR is the time synchronization error; R cm is the slope distance of the migration curve; R sm is the distance and; Δph is the phase synchronization error; R sm0 is the initial value of the distance and ; λ is the wavelength of the slave radar echo data.

7. The method according to claim 6, characterized in that The correction data is calculated by the following formula: Rn=rn-δR Src(ta,tao)'=Src(ta,tao)*exp(j*Δph) Wherein, Rn is the corrected sampling starting value; Src(ta,tao)' is the echo signal after the corrected range pulse pressure processing; Src(ta,tao) is the echo data after the initial range pulse pressure processing.

8. An airborne bistatic SAR imaging quality enhancement device, characterized in that: include: An acquisition module, used to acquire the position coordinates of the master radar and the slave radar in a preset coordinate system; wherein the preset coordinate system is established with an active calibrator for transmitting and receiving radar signals as the coordinate origin; The first processing module is used to perform range pulse pressure processing on the original echo data of the slave radar, and extract the processed data to obtain a migration curve composed of image column positions; The second processing module is used to perform error compensation processing on the echo data of the slave radar according to the position coordinates and the migration curve to obtain corrected data; The third processing module is used to perform azimuth coherent accumulation processing on the corrected data to obtain a bistatic SAR image with enhanced quality.

9. An electronic device, characterized in that: The method comprises a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the method according to any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and when the computer program is executed in a computer, the computer is caused to execute the method according to any one of claims 1 to 7.

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