Non-linear track SAR high-precision interference method and device based on inverter standard

Abstract

The invention provides a nonlinear track SAR (Synthetic Aperture Radar) high-precision interference method and a nonlinear track SAR high-precision interference device based on an inversion standard, and belongs to the field of synthetic aperture radar confrontation of an electronic support system (ESM). Comprising the following steps: a jammer detects and receives SAR platform, SAR antenna and SAR signal parameters of an SAR radar entering a detection range; performing distance space-variant component phase construction on the linear track initialization input signal in a two-dimensional time domain to form a nonlinear track SAR interference frequency response function of a distance space-variant component; track offset term compensation of a scene space-invariant component is carried out on the nonlinear track SAR interference frequency response function of the distance space-variant component in a distance frequency domain; and a jammer modulation and forwarding stage: carrying out convolution modulation on the intercepted SAR signal and then forwarding the signal to the SAR. According to the method, the interference precision of the nonlinear track SAR deception interference is ensured.

Description

Technical Field

[0001] The present invention belongs to the field of electronic support measures (ESM) synthetic aperture radar countermeasures, and in particular to a non-straight track SAR high-precision jamming method and device based on an inversion mark. Background Art

[0002] Synthetic aperture radar (SAR) has become an important detection tool due to its advantages such as all-day, all-weather working ability and high processing gain. However, in order to deal with the interference problem of SAR, related technologies have received widespread attention. The interference methods of SAR are mainly divided into suppression interference and deception interference. Suppression interference hinders SAR data processing by masking the real echo, while deception interference implants false scenes in SAR images by forwarding false target or scene echo signals with specific electromagnetic scattering characteristics. It is valued for its high processing gain and flexibility.

[0003] However, most existing SAR deception jamming methods are based on the straight track assumption, which requires the SAR track position to be estimated in advance to calculate the slant range. In practical applications, the SAR platform may deviate from the estimated track due to factors such as airflow changes, and perform non-straight track motion compensation imaging. This will cause the straight track deception jamming signal to have large range migration errors and high-order phase errors during the imaging process, causing the jamming to fail.

[0004] In the prior art, such as Chinese patent CN107064886B, a deception jamming method based on offline calculation and online variation is proposed, but it relies on interpolation calculation, has low modulation efficiency, and is difficult to achieve effective jamming. Chinese patent application CN202310270557.6 proposes a track deviation compensation method based on a hybrid domain, but this method is based on the two-dimensional beam center approximation assumption and ignores the influence of some range migration, resulting in poor jamming effect on SAR systems with high resolution and large track deviation.

[0005] Therefore, there is an urgent need for a highly efficient method for generating non-straight track SAR deception jamming signals that can adapt to large track deviations in order to effectively deal with the SAR jamming problem. Summary of the invention

[0006] Traditional SAR deception jamming methods rely on the generation of cross-coupling terms of interference signals of ideal straight-line track SAR to achieve SAR deception jamming, but these methods have an obvious disadvantage that it is difficult to apply deception jamming to actual non-straight-line track SAR. In order to solve this technical problem, the present invention proposes a non-straight-line track SAR high-precision jamming method and device based on inversion mark, which solves the problem that the current SAR deception jamming method is difficult to adapt to non-straight-line track SAR.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] A high-precision jamming method for non-linear track SAR based on inverse transformation includes the following steps:

[0009] Step 1: The jammer intercepts the platform, antenna and signal parameters of the SAR radar, selects a SAR image template with complex backscattering coefficient, generates a linear track SAR jamming frequency response function and converts it to two-dimensional time domain to obtain a linear track initialization input signal;

[0010] Step 2: Construct a range-variant component phase for the linear track initialization input signal in the two-dimensional time domain, convert it to the range frequency domain for range inverse matched filtering, and construct a range chirp term and an azimuth phase of non-linear track scale;

[0011] Step 3: Perform an inverse scale transformation on the range chirp term and azimuth phase of non-linear track scale, and form a non-linear track SAR jamming frequency response function of range-variant component through linear track scale range compression;

[0012] Step 4: Compensate the track offset term of the scene invariant component for the non-linear track SAR jamming frequency response function of range-variant component in the range frequency domain to obtain a non-linear track SAR jamming frequency response function related to the false scene;

[0013] Step 5: Multiply the jamming frequency response function related to the jammer by the non-linear track SAR jamming frequency response function related to the false scene to obtain a non-linear track SAR jamming frequency response function, which is convolved and modulated with the intercepted SAR signal and then forwarded to the SAR.

[0014] The present invention also provides a high-precision jamming device for non-linear track SAR based on inverse transformation, including the following modules:

[0015] A signal generation module, which is used to make the jammer intercept the platform, antenna and signal parameters of the SAR radar, select a SAR image template with complex backscattering coefficient, generate a linear track SAR jamming frequency response function and convert it to two-dimensional time domain to obtain a linear track initialization input signal;

[0016] An azimuth phase construction module, which constructs a range-variant component phase for the linear track initialization input signal in the two-dimensional time domain, converts it to the range frequency domain for range inverse matched filtering, and constructs a range chirp term and an azimuth phase of non-linear track scale;

[0017] The non - linear track SAR interference frequency response function formation module for range - space - variant components performs inverse scale transformation on the range - chirp term and azimuth - phase at the non - linear track scale, and forms the non - linear track SAR interference frequency response function of range - space - variant components through range compression at the linear track scale;

[0018] The non - linear track SAR interference frequency response function formation module related to the false scene compensates the track - offset term of the scene - invariant component for the non - linear track SAR interference frequency response function of range - space - variant components in the range frequency domain, and obtains the non - linear track SAR interference frequency response function related to the false scene;

[0019] The modulation module multiplies the interference frequency response function related to the jammer by the non - linear track SAR interference frequency response function related to the false scene, obtains the non - linear track SAR interference frequency response function, and after convolution modulation with the intercepted SAR signal, forwards it to the SAR.

[0020] The present invention also provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the program, the steps of the above - mentioned non - linear track SAR high - precision interference method based on inverse scaling are implemented.

[0021] The present invention also provides a non - transitory computer - readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the above - mentioned non - linear track SAR high - precision interference method based on inverse scaling are implemented.

[0022] Advantageous effects:

[0023] The present invention has significant advantages in non - linear track SAR interference: First, by constructing the track - offset term of the interference frequency response function in the azimuth time domain, high - precision deception interference on non - linear track SAR is achieved. Its flexible and simple modulation calculation method and high - precision signal model ensure the accuracy of the interference effect. Second, the interference modulation process mainly relies on the range - time - frequency transformation in the azimuth time domain, only requiring range fast Fourier transform and complex multiplication operations. Compared with the existing real - time interpolation track mutation method, the calculation efficiency is greatly improved. Finally, the present invention effectively reduces the calculation resource requirements by compensating and constructing the track - offset term in real - time based on the linear track interference frequency response function, and significantly saves hardware storage resources compared with the existing real - time interpolation and single - generation schemes in the prior art. Description of the drawings

[0024] Figure 1 is a three - dimensional geometric model diagram of non - linear track SAR;

[0025] Figure 2 is a geometric model diagram of the slant - range section of non - linear track SAR;

[0026] Figure 3 is a flowchart of the non-linear trajectory SAR high-precision interference method based on the inverse transformation standard of the present invention;

[0027] Figure 4 is a close-up image of the false target point P1 generated by the RS algorithm;

[0028] Figure 5 is a range profile of the false target point P1 generated by the HDE algorithm;

[0029] Figure 6 is an azimuth profile of the false target point P1 generated by the ISR algorithm;

[0030] Figure 7a is a range profile of the false target point P1;

[0031] Figure 7b is an azimuth profile of the false target point P1;

[0032] Figure 8a is a range profile of the false target point P2;

[0033] Figure 8b is an azimuth profile of the false target point P2;

[0034] Figure 9a is a range profile of the false target point P3;

[0035] Figure 9b is an azimuth profile of the false target point P3;

[0036] Figure 10 is an imaging diagram of the real scene echo;

[0037] Figure 11 is an imaging diagram of the real scene echo mixed interference signal;

[0038] Figure 12 It is a schematic diagram of the non-linear trajectory SAR high-precision interference device based on the inverse transformation standard of the present invention. Specific embodiments

[0039] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0040] As Figure 3 shown, a non-linear trajectory SAR high-precision interference method according to an embodiment of the present invention includes the following steps:

[0041] Step 1: The jammer intercepts the SAR platform, SAR antenna, and SAR signal parameters of the SAR radar entering the detection range. According to the interference target requirements, an SAR image template with complex backscattering coefficients is selected, and a linear track SAR interference frequency response function is generated. Then, the interference frequency response function is transformed into the two-dimensional time domain to obtain the linear track initialization input signal.

[0042] Step 2: In the two-dimensional time domain, the range-variant component phase of the linear track initialization input signal is constructed and transformed to the range frequency domain for range inverse matching filtering to construct the range chirp term and azimuth phase of the non-linear track scale.

[0043] Step 3: In the two-dimensional time domain, the range chirp term and azimuth phase of the non-linear track scale are inverse scaled, and then through the linear track scale range compression, a non-linear track SAR interference frequency response function of the range-variant component is formed.

[0044] Step 4: In the range frequency domain, the track offset term of the scene-invariant component of the non-linear track SAR interference frequency response function of the range-variant component is compensated to obtain a non-linear track SAR interference frequency response function related to the false scene.

[0045] Step 5: In the modulation and forwarding stage of the jammer, the interference frequency response function related to the jammer is multiplied by the non-linear track SAR interference frequency response function related to the false scene to obtain the non-linear track SAR interference frequency response function, which is convolved and modulated with the intercepted SAR signal and then forwarded to the SAR.

[0046] The steps of the embodiments of the present invention will be further explained below with reference to the accompanying drawings. When the jammer interferes with the non-linear track SAR system, the geometric relationship among the SAR, the jammer, and the deception interference area is as Figure 1 and Figure 2 shown. Among them, is the origin of the coordinate system, is the flight speed of the SAR. The X-axis points to the azimuth direction, The Y-axis points to the range direction, The Z-axis points to the altitude direction. The ideal linear track of the SAR is parallel to the X-axis, and the vector represents the absolute deviation vector of the actual non-linear track relative to the linear track. and respectively represent the horizontal and vertical offsets of the SAR flight platform relative to the linear track, is the elevation angle of the track offset relative to the linear track, is the down-looking angle of the SAR antenna. The jammer is placed at the point, represents the large scene deception interference area Any point in it, and the beam center point with the same nearest slant range and height is , is the difference in azimuth distance between point and point and are the local perspectives of point and . is the slant range from the jammer to the SAR antenna position under a non - straight flight path. is the x - axis coordinate of point P, is the shortest slant range between the radar antenna and point under a straight flight path, is the instantaneous slant range difference between the non - straight and straight flight paths when the beam center irradiates point , and are the slant ranges from the target to the SAR antenna position under non - straight and straight flight paths respectively, is the ground distance offset of point relative to the scene center position.

[0047] Specifically, step 1 includes:

[0048] Step 1.1, select the SAR parameters detected during the jammer reception phase, mainly including the following three types:

[0049] (1) SAR signal parameters, including: center frequency , signal bandwidth , pulse width and pulse repetition frequency ;

[0050] (2) SAR antenna parameters, including: synthetic aperture length ;

[0051] (3) SAR platform parameters, including: flight speed and the instantaneous slant range under the ideal straight flight path of the SAR .

[0052] The above - mentioned relevant parameters are mainly used to construct the interference frequency response function of the SAR ideal straight flight path. When the interference target is a non - straight flight path SAR, the flight path offset of the SAR is obtained during the real - time modulation phase and the flight path offset is calculated for the flight path offset construction of the interference frequency response function.

[0053] Step 1.2, according to the interference target requirements, select the one with the complex backscattering coefficient ​​​SAR image templates and generate the frequency response function of the straight-track SAR interference. There are already many existing methods for straight-track SAR deception interference, and these methods have different emphases on modulation efficiency and modulation accuracy, and can directly generate the frequency response function of the straight-track SAR interference related to the false scene. .

[0054] ;

[0055] Among them, is the imaginary unit, is the speed of light, is the range window, is the antenna pattern. is the frequency axis in the range direction, is the slow time axis in the azimuth direction, is the center frequency of the SAR, is the signal bandwidth, and exp represents the exponential function.

[0056] Step 1.3: Convert the frequency response function of the straight-track SAR interference related to the false scene to the two-dimensional time domain to obtain the initialized input signal of the straight track. :

[0057] ;

[0058] Among them, is the pulse width, is the fast time axis in the range direction, is the wavelength, is the signal chirp rate, is the point spread function after range focusing.

[0059] Specifically, the said step 2 includes:

[0060] Step 2.1: Construct the range-variant component phase on the basis of the initialized input signal of the straight track. , The generation of depends on the decomposition of the slant range offset

[0061] ;

[0062] Among them, H is the flight height of the ideal straight track, is the slant range at the scene center, is the scene-invariant component of the track offset, is the range-variant component of the track offset, is the linear change rate of the track offset. is the z-axis offset, is the y-axis offset.

[0063] Then It can be expressed as:

[0064] ;

[0065] Step 2.2: Convert the input signal after phase construction to the range-frequency domain for inverse range matching filtering, construct the range chirp term of the non-linear track scale, and the inverse matching filtering function can be expressed as:

[0066] ;

[0067] Obtain the range chirp term and azimuth phase under the non-linear track scale , which can be expressed as:

[0068] ;

[0069] Specifically, the said Step 3 includes:

[0070] Step 3.1: Through the inverse scale transformation function transform the phase of the non-linear track scale into the phase of the linear track scale :

[0071] ;

[0072] Among them, .

[0073] Step 3.2: Through the linear track scale matching filtering function remove the range chirp term to obtain the non-linear track SAR interference frequency response function of the range-variant component :

[0074] ;

[0075] Among them, .

[0076] Specifically, the said Step 4 includes: compensating the track offset term of the scene invariant component for the non-linear track SAR interference frequency response function of the range-variant component in the range-frequency domain to obtain the non-linear track SAR interference frequency response function related to the false scene :

[0077] ;

[0078] Specifically, the said Step 5 includes:

[0079] Step 5.1: The interference frequency response function related to the jammer Non-linear Trajectory SAR Jamming Frequency Response Function Related to False Scenarios Multiply to obtain the non-linear trajectory SAR jamming frequency response function :

[0080] ;

[0081] wherein, .

[0082] Step 5.2, perform frequency domain convolution operation on the intercepted SAR signal and the non-linear trajectory SAR jamming frequency response function to obtain the retransmitted jamming signal :

[0083] ;

[0084] wherein, is the inverse Fourier transform in the range direction, is the Fourier transform in the range direction. is the one-way SAR signal intercepted and stored by the receiver.

[0085] To verify the effectiveness of the present invention, simulations are carried out in the present invention. Assume that the SAR radar parameters are as shown in Table 1.

[0086] Table 1

[0087] The first group of simulation experiments is to verify the jamming accuracy of the present invention. Set a point target with coordinates of , , in the pre-jamming area, generate the jamming signal of the false point target, and analyze the imaging index of the point target. Figure 4 , Figure 5 and Figure 6 show the close-up images of the point target after the jamming signal implemented by the method of the present invention is imaged in the SAR radar. At the same time, compare and analyze the indexes of the jamming point target generated by the present invention with the original echo imaging point target (RS) and the deception jamming point target of the hybrid domain efficient algorithm (HDE). The comparison of the point target profiles is as Figure 7a , Figure 7b , Figure 8a , Figure 8b and Figure 9a , Figure 9b shown.

[0088] Table 2

[0089] The index analysis includes the 3dB impulse response width (IRW), peak sidelobe ratio (PSLR), and integrated sidelobe ratio (ISLR), as shown in Table 2 (Index Analysis Table). The simulation experiment results show that the deceptive interference signal generated by the present invention can ensure extremely high interference accuracy, which is basically consistent with the real point target imaging of the SAR radar.

[0090] The second group of simulation experiments uses the method of the present invention to conduct deceptive interference on house targets and forest targets in a real scene, where the real scene imaging is as Figure 10 shown. Figure 11 It shows the imaging result in the SAR radar after mixing the interference signal implemented by the method of the present invention with the real scene echo. It can be found that the deceptive interference signal generated by the present invention can well retain the deceptive electromagnetic features such as false scene points, lines, surfaces, and brightness when countering large squint angle SAR, achieving a realistic deception effect.

[0091] As Figure 12 shown, the present invention also provides a high-precision interference device for non-linear track SAR based on inverse calibration, including the following modules:

[0092] A signal generation module, which is used to enable the jammer to detect the platform, antenna, and signal parameters of the SAR radar, select an SAR image template with a complex backscattering coefficient, generate a linear track SAR interference frequency response function and convert it to the two-dimensional time domain to obtain a linear track initialization input signal;

[0093] An azimuth phase construction module constructs a range space-variant component phase for the linear track initialization input signal in the two-dimensional time domain, converts it to the range frequency domain for range inverse matching filtering, and constructs a range chirp term and an azimuth phase of the non-linear track scale;

[0094] A non-linear track SAR interference frequency response function formation module for the range space-variant component performs an inverse scale transformation on the range chirp term and azimuth phase of the non-linear track scale, and forms a non-linear track SAR interference frequency response function of the range space-variant component through range compression of the linear track scale;

[0095] A non-linear track SAR interference frequency response function formation module related to the false scene compensates the track offset term of the scene invariant component for the non-linear track SAR interference frequency response function of the range space-variant component in the range frequency domain to obtain a non-linear track SAR interference frequency response function related to the false scene;

[0096] A modulation module multiplies the interference frequency response function related to the jammer by the non-linear track SAR interference frequency response function related to the false scene to obtain a non-linear track SAR interference frequency response function, which is convolutionally modulated with the intercepted SAR signal and then forwarded to the SAR.

[0097] The present invention also provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the program, the steps of the above-mentioned non-linear trajectory SAR high-precision interference method based on the inverse transformation target are implemented.

[0098] The present invention also provides a non-transitory computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the above-mentioned non-linear trajectory SAR high-precision interference method based on the inverse transformation target are implemented.

[0099] Those skilled in the art should understand that the embodiments of the present invention can be provided as a method, a system, or a computer program product. Therefore, the present invention can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present invention can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk memories, CD-ROMs, optical memories, etc.) containing computer-usable program codes. The solutions in the embodiments of the present invention can be implemented in various computer languages. For example, object-oriented programming languages such as Java and interpreted scripting languages such as JavaScript.

[0100] The present invention is described with reference to the flowcharts and / or block diagrams of the method, apparatus (system), and computer program product according to the embodiments of the present invention. It should be understood that each flow and / or block in the flowchart and / or block diagram, as well as the combination of flows and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate a device for implementing the functions specified in Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0101] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory generate a manufactured article including an instruction device, and the instruction device implements the functions specified in Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0102] These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus, so that a series of operational steps are performed on the computer or other programmable apparatus to produce a computer-implemented process, thereby providing steps for implementing the functions specified in one process or a plurality of processes and / or boxes Figure 1 one process or a plurality of processes and / or boxes Figure 1 in one box or a plurality of boxes.

[0103] Although the preferred embodiments of the present invention have been described, additional changes and modifications can be made by those skilled in the art once they learn of the basic inventive concept. Therefore, the appended claims are intended to be construed to cover the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0104] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these modifications and variations.

Claims

1. A non-linear track SAR high-precision jamming method based on inversion mark, characterized in that: The following steps are involved: Step 1: The jammer detects the platform, antenna and signal parameters of the SAR radar, selects a SAR image template with a complex backscatter coefficient, generates a straight track SAR jammer frequency response function and converts it to a two-dimensional time domain to obtain a straight track initialization input signal; Step 2: construct the phase of the range space-variant component of the input signal of the straight track initialization in the two-dimensional time domain, convert it to the range frequency domain to perform range inverse matching filtering, and construct the range frequency modulation term and azimuth phase of the non-straight track scale; Step 3, inversely scale the range frequency modulation term and azimuth phase of the non-linear track scale, and form a non-linear track SAR interference frequency response function of the range space-variant component through linear track scale distance compression; Step 4: Compensate the non-linear track SAR interference frequency response function of the range space-variant component by the track offset term of the scene space-invariant component in the range frequency domain to obtain the non-linear track SAR interference frequency response function associated with the false scene; Step 5: Multiply the jammer-related interference frequency response function with the non-linear track SAR interference frequency response function related to the false scene to obtain the non-linear track SAR interference frequency response function, which is convoluted and modulated with the intercepted SAR signal and then forwarded to the SAR.

2. According to the non-straight track SAR high-precision jamming method based on inversion mark in claim 1, it is characterized in that: In step 1, the SAR platform parameters include flight speed , Instantaneous slant range under SAR ideal straight line track .

3. The non-straight track SAR high-precision jamming method based on inversion mark according to claim 2 is characterized in that: The step 1 comprises: According to the interference target requirements, select the SAR image template, and generate a straight-line track SAR interference frequency response function; generate a straight-line track SAR interference frequency response function related to the false scene ;in, is the radar antenna and point under the straight track The shortest slope distance between is the distance to frequency axis, is the azimuth slow time axis; is the x-axis coordinate of point P; point P is the target; The straight-line SAR interference frequency response function related to the false scene is converted into the two-dimensional time domain to obtain the straight-line initialization input signal ;in, For distance to fast time axis.

4. The non-straight track SAR high-precision jamming method based on inversion mark according to claim 3 is characterized in that: The step 2 comprises: Step 2.1: construct the phase of the distance-varying component based on the straight-line track initialization input signal ; Step 2.2: Convert the input signal after phase construction to the range frequency domain for range inverse matching filtering, construct the range frequency modulation term of the non-linear track scale, and construct the inverse matching filter function , thus obtaining the range frequency modulation term and azimuth phase under the non-straight track scale .

5. The non-straight track SAR high-precision jamming method based on inversion mark according to claim 4 is characterized in that: The step 3 comprises: Step 3.1, through the inverse scaling function Transforming non-straight track scale into straight track scale; Step 3.2, by matching the filter function to the straight track scale Remove the range frequency modulation term and obtain the frequency response function of non-linear track SAR interference of range space-varying component .

6. The non-straight track SAR high-precision jamming method based on inversion mark according to claim 5 is characterized in that: The step 4 comprises: In the range frequency domain, the non-linear track SAR interference frequency response function of the range space-variant component is compensated for the track offset term of the scene space-invariant component to obtain the non-linear track SAR interference frequency response function related to the false scene. .

7. The non-straight track SAR high-precision jamming method based on inversion mark according to claim 1 is characterized in that: The step 5 comprises: Step 5.1, the jammer-related interference frequency response function Frequency response function of non-straight-track SAR jammers associated with false scenarios Multiply to get the non-straight track SAR interference frequency response function ; Step 5.2: Receive the intercepted SAR signal Frequency response function of SAR interference with non-straight track Perform frequency domain convolution operation to obtain the forwarding interference signal ; in, is the inverse Fourier transform of the distance, is the distance to Fourier transform, To intercept and store one-way SAR signals for the receiver.

8. A non-linear track SAR high-precision jammer based on an inversion target, characterized in that: Includes the following modules: The signal generation module is used to enable the jammer to detect the platform, antenna and signal parameters of the SAR radar, select the SAR image template with complex backscatter coefficients, generate the straight track SAR jammer frequency response function and convert it to the two-dimensional time domain to obtain the straight track initialization input signal; The azimuth phase construction module constructs the phase of the range space-variant component of the input signal initialized by the straight track in the two-dimensional time domain, converts it to the range frequency domain for range inverse matching filtering, and constructs the range frequency modulation term and azimuth phase of the non-straight track scale; The module for forming the frequency response function of non-linear track SAR interference of the distance space-variant component performs inverse scale transformation on the range frequency modulation term and azimuth phase of the non-linear track scale, and forms the frequency response function of non-linear track SAR interference of the distance space-variant component through the distance compression of the linear track scale; A module for forming a frequency response function of non-linear track SAR interference associated with a false scene is used to compensate the frequency response function of non-linear track SAR interference associated with a range space-variant component by a track offset term of a scene space-invariant component in a range-frequency domain to obtain a frequency response function of non-linear track SAR interference associated with a false scene; The modulation module multiplies the jammer-related interference frequency response function with the non-straight track SAR interference frequency response function related to the false scene to obtain the non-straight track SAR interference frequency response function, which is convoluted and modulated with the intercepted SAR signal and then forwarded to the SAR.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the steps of a non-straight track SAR high-precision jamming method based on an inversion marker are implemented as claimed in any one of claims 1 to 7.

10. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of a non-straight track SAR high-precision jamming method based on an inversion target as claimed in any one of claims 1 to 7 are implemented.

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