High-precision jamming method and device for non-linear SAR tracks based on inverted standard

Abstract

This invention provides a high-precision jamming method and apparatus for non-linear SAR based on inverter-driven targets, belonging to the field of synthetic aperture radar countermeasures in Electronic Support Measures (ESM). It includes: a jammer detecting the SAR platform, SAR antenna, and SAR signal parameters of a SAR radar entering its detection range; constructing the range-space-variable component phase of the initial input signal for a linear trajectory in the two-dimensional time domain, forming a range-space-variable component non-linear SAR jamming frequency response function; compensating for the trajectory offset term of the scene-space-invariant component of the range-space-variable component non-linear SAR jamming frequency response function in the range-frequency domain; and in the jammer's modulation and forwarding stage, convolving and modulating the jammed SAR signal with the intercepted SAR signal before forwarding it to the SAR. This invention ensures the jamming accuracy of non-linear SAR deception jamming.

Description

Technical Field

[0001] This invention belongs to the field of electronic support measures (ESM) synthetic aperture radar countermeasures, and in particular relates to a high-precision jamming method and device for non-linear SAR based on an inverter. Background Technology

[0002] Synthetic Aperture Radar (SAR) has become an important detection tool due to its all-weather, all-day operation and high processing gain. However, to address SAR jamming issues, related technologies have received widespread attention. SAR jamming methods are mainly divided into suppression jamming and deception jamming. Suppression jamming hinders SAR data processing by masking real echoes, while deception jamming implants false scenes into SAR images by forwarding echo signals of false targets or scenes with specific electromagnetic scattering characteristics. It has gained importance due to its high processing gain and flexibility.

[0003] However, most existing SAR deception jamming methods are based on the assumption of a straight track, requiring prior estimation of the SAR track position and calculation of the slant range. In practical applications, the SAR platform may deviate from the predicted track due to factors such as airflow changes, resulting in non-linear track motion compensation imaging. This leads to significant range migration errors and higher-order phase errors in the straight-track deception jamming signal during imaging, causing the jamming to fail.

[0004] In existing technologies, such as Chinese patent CN107064886B, a deception jamming method based on offline calculation and online variation is proposed. However, it relies on interpolation calculation, has low modulation efficiency, and is difficult to achieve effective jamming. Chinese patent application CN202310270557.6 proposes a track offset compensation method based on a hybrid domain. However, 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 high-resolution SAR systems with large track offsets.

[0005] Therefore, there is an urgent need for a highly efficient method for generating SAR deception jamming signals that can adapt to large track offsets and non-linear tracks, in order to effectively address SAR jamming issues. Summary of the Invention

[0006] Traditional SAR deception jamming methods rely on generating cross-coupling terms of interference signals from ideal straight-track SAR to achieve SAR deception jamming. However, these methods have a significant drawback: they are difficult to apply to real-world non-straight-track SAR. To address this technical problem, this invention proposes a high-precision jamming method and apparatus for non-straight-track SAR based on an inverter, solving the problem that current SAR deception jamming methods are difficult to adapt to non-straight-track SAR.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A high-precision jamming method for non-linear SAR tracks based on inverted targets includes the following steps:

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

[0010] Step 2: Initialize the input signal for the straight-line track in the two-dimensional time domain to construct the range spatially variable component phase, convert it to the range frequency domain and perform range inverse matched filtering to construct the range frequency modulation term and azimuth phase at the scale of the non-straight-line track.

[0011] Step 3: Perform inverse scaling transformation on the range-direction frequency modulation term and azimuth-direction phase of the non-linear track scale, and form the non-linear track SAR interference frequency response function with range spatial variation component by range compression of the straight track scale.

[0012] Step 4: Compensate for the trajectory offset term of the scene spatial invariant component of the non-linear SAR interference frequency response function of the range spatial variable component in the range frequency domain to obtain the non-linear SAR interference frequency response function related to the false scene.

[0013] Step 5: Multiply the jamming frequency response function related to the jammer with the non-linear trajectory SAR jamming frequency response function related to the false scene to obtain the non-linear trajectory SAR jamming frequency response function, and then convolve and modulate it with the intercepted SAR signal before forwarding it to the SAR.

[0014] This invention also provides a high-precision jamming device for non-linear SAR based on an inverter standard, comprising the following modules:

[0015] 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 backscattering coefficient, generate the SAR jamming frequency response function of the straight track and convert it to the two-dimensional time domain to obtain the straight track initialization input signal.

[0016] The azimuth phase construction module constructs the range spatially variable component phase of the input signal for the straight-line track initialization in the two-dimensional time domain, converts it to the range frequency domain for range inverse matched filtering, and constructs the range frequency modulation term and azimuth phase at the scale of the non-straight-line track.

[0017] The range-space-variable component non-linear track SAR interference frequency response function generation module performs inverse-scale transformation on the range-direction frequency modulation term and azimuth-direction phase of the non-linear track scale, and generates the range-space-variable component non-linear track SAR interference frequency response function through range compression of the linear track scale.

[0018] The module for forming the frequency response function of non-linear SAR interference related to false scenes compensates for the trajectory offset term of the spatially variable component of the non-linear SAR interference frequency response function of the range in the range frequency domain, thereby obtaining the frequency response function of non-linear SAR interference related to false scenes.

[0019] The modulation module multiplies the jamming frequency response function related to the jammer with the non-linear trajectory SAR jamming frequency response function related to the false scene to obtain the non-linear trajectory SAR jamming frequency response function, which is then convolved and modulated with the intercepted SAR signal before being forwarded to the SAR.

[0020] The present invention also 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 steps of the above-described high-precision jamming method for non-linear SAR based on an inverted target.

[0021] The present invention also provides a non-transitory computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the steps of the above-described high-precision jamming method for non-linear SAR tracks based on inverted targets.

[0022] Beneficial effects:

[0023] This invention offers significant advantages in jamming non-linear SAR tracks: First, by constructing a track offset term from the jamming frequency response function in the azimuth time domain, it achieves high-precision deception jamming of non-linear SAR tracks. Its flexible and concise modulation calculation method and high-precision signal model ensure the accuracy of the jamming effect. Second, the jamming modulation process mainly relies on the range-to-frequency transformation in the azimuth time domain, requiring only range-to-frequency fast Fourier transform and complex multiplication operations, significantly improving computational efficiency compared to existing real-time interpolation track variation methods. Finally, by constructing the track offset term in real-time based on the jamming frequency response function of a linear track, this invention effectively reduces computational resource requirements, significantly saving hardware storage resources compared to existing real-time interpolation and single-generation schemes. Attached Figure Description

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

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

[0026] Figure 3 is a flowchart of the high-precision jamming method for non-linear SAR tracks based on the inverter 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 distance profile of the false target point P1 generated by the HDE algorithm;

[0029] Figure 6 is the 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 echo image of a real scene;

[0037] Figure 11 is an image of the mixed interference signal of the echo in a real scene;

[0038] Figure 12 This is a schematic diagram of the high-precision jamming device for non-linear SAR based on inverter targets according to the present invention. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this invention clearer, the 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 merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0040] like Figure 3 As shown in the figure, an embodiment of the present invention provides a high-precision jamming method for non-linear SAR tracks based on inverters, comprising the following steps:

[0041] Step 1: The jammer detects the SAR platform, SAR antenna, and SAR signal parameters of the SAR radar entering the detection range. Based on the jamming target requirements, a SAR image template with complex backscattering coefficients is selected, and a straight-track SAR jamming frequency response function is generated. Then, the jamming frequency response function is converted to the two-dimensional time domain to obtain the straight-track initialization input signal.

[0042] Step 2: Construct the range-space-varying component phase of the input signal for the straight-line trajectory initialization in the two-dimensional time domain, and convert it to the range-frequency domain for range inverse matched filtering to construct the range-direction frequency modulation term and azimuth-direction phase at the non-straight-line trajectory scale.

[0043] Step 3: Perform inverse scaling transformation on the range-direction frequency modulation term and azimuth-direction phase of the non-linear track scale in the two-dimensional time domain, and then compress the range at the linear track scale to form the non-linear track SAR interference frequency response function with range spatial variation components.

[0044] Step 4: Compensate for the track offset term of the scene spatial invariant component of the non-linear track SAR interference frequency response function of the range spatial variable component in the range frequency domain to obtain the non-linear track SAR interference frequency response function related to the false scene.

[0045] Step 5: Jammer modulation and forwarding stage. The jamming frequency response function related to the jammer is multiplied by the non-linear track SAR jamming frequency response function related to the false scene to obtain the non-linear track SAR jamming frequency response function. This function is then convolved and modulated with the intercepted SAR signal before being 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 a jammer interferes with a non-linear SAR system, the geometric relationship between the SAR, the jammer, and the deception interference area is as follows: Figure 1 and Figure 2 As shown. Among them, Let O be the origin of the coordinate system. This refers to the SAR's flight speed. The axis points in the azimuth direction. The axis points in the distance direction. The axis points in the altitude direction. The ideal straight track for SAR is parallel to the X-axis, and the vector... This represents the absolute deviation vector of the actual non-linear trajectory relative to the linear trajectory. and These represent the horizontal and vertical offsets of the SAR flight platform relative to its straight flight path, respectively. This is the elevation angle of the track offset relative to the straight track. This is the downward view from the SAR antenna. The jammer is placed... point, Represents a large-scale deception and interference area. For any point in the array, the beam center point with the same nearest slant range and altitude is... , for Dot and Point azimuth distance difference. and It is a point and A local perspective. jammers on non-linear flight paths Slant distance to the SAR antenna location. Let P be the x-coordinate of point P. For radar antenna and point under straight flight path The shortest slope distance between them Illuminate the center of the beam The instantaneous slant range difference between non-linear and straight tracks at point time. and Targets on non-linear and linear paths, respectively. Slant range to the SAR antenna location For point The offset from the center of the scene.

[0047] Specifically, step 1 includes:

[0048] Step 1.1: Select the SAR parameters to be detected during the jamming detection phase. These mainly include 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 Instantaneous slant range under ideal straight SAR trajectory .

[0052] The aforementioned parameters primarily enable the construction of the interference frequency response function for an ideal straight-line SAR trajectory. When the interfering target is a non-straight-line SAR, the SAR trajectory offset is acquired during the real-time modulation phase. The track offset is calculated and used to construct the track offset for the interference frequency response function.

[0053] Step 1.2: Select a target with a complex backscattering coefficient according to the requirements of the interference target. The SAR image template is used to generate a straight-track SAR jamming frequency response function. There are many existing methods for straight-track SAR deception jamming, each with its own emphasis on modulation efficiency and accuracy. These methods can directly generate a straight-track SAR jamming frequency response function related to a fake scene. .

[0054] ;

[0055] in, The imaginary unit, At the speed of light, For distance window, This is the antenna radiation pattern. For the range frequency axis, Assigned to the slower time axis, The SAR center frequency, Let be the signal bandwidth, and exp represent the exponential function.

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

[0057] ;

[0058] in, The pulse width. For distance along the fast time axis, For wavelength, To adjust the frequency of the signal, This is the distance-to-focus point expansion function.

[0059] Specifically, step 2 includes:

[0060] Step 2.1: Construct the range-space-varying phase component based on the input signal for the straight-line trajectory initialization. , The generation depends on the slant range offset. Decomposition:

[0061] ;

[0062] Where H is the flight altitude of the ideal straight-line trajectory. The slant distance from the scene center. The scene space-invariant component for track offset. The range spatially varying component of the track offset. This represents the linear rate of change of the track offset. This is the z-axis offset. This is the y-axis offset.

[0063] but It can be represented as:

[0064] ;

[0065] Step 2.2: Convert the phase-constructed input signal to the range frequency domain and perform range inverse matched filtering. Construct a range-direction frequency modulation term at the non-linear trajectory scale, and the inverse matched filter function... It can be represented as:

[0066] ;

[0067] The range-direction frequency modulation term and azimuth-direction phase are obtained at the non-linear trajectory scale. , can be represented as:

[0068] ;

[0069] Specifically, step 3 includes:

[0070] Step 3.1, using the inverse scaling function Phase transformation from a non-linear trajectory scale to a linear trajectory scale. :

[0071] ;

[0072] in, .

[0073] Step 3.2, using the scale-matched filter function for straight-line tracks. After removing the range-modulated term, the non-linear SAR interference frequency response function of the range-space-varying component is obtained. :

[0074] ;

[0075] in, .

[0076] Specifically, step 4 includes: compensating for the track offset term of the scene spatially invariant component of the non-linear SAR interference frequency response function of the range spatially varying component in the range frequency domain. The frequency response function of SAR interference for non-linear paths related to the false scene is obtained. :

[0077] ;

[0078] Specifically, step 5 includes:

[0079] Step 5.1, the jamming frequency response function related to the jammer. Frequency response function of non-linear SAR interference associated with fake scenarios Multiplying yields the SAR interference frequency response function for non-linear tracks. :

[0080] ;

[0081] in, .

[0082] Step 5.2, receive the intercepted SAR signals Frequency response function of SAR interference with non-linear flight paths Frequency domain convolution operation is performed to obtain the forwarding interference signal. :

[0083] ;

[0084] in, For distance to inverse Fourier transform, This is a distance-to-Fourier transform. To intercept and store one-way SAR signals for the receiver.

[0085] To verify the effectiveness of this invention, simulations were performed. The SAR radar parameters are assumed to be as shown in Table 1.

[0086] Table 1

[0087] The first set of simulation experiments, in order to verify the interference accuracy of the present invention, set the coordinates in the pre-interference region as follows: , , The point target is generated by generating interference signals of false point targets for point target imaging index analysis. Figure 4 , Figure 5 and Figure 6 This paper presents a close-up image of a point target after the jamming signal is imaged in a SAR radar using the method of this invention. A comparative analysis of the jamming point targets generated by this invention is also performed, comparing them with the original echo imaging point targets (RS) and the jamming point targets deceived by the Hybrid Domain Efficient Algorithm (HDE). The point target profile images are shown for example... Figure 7a , Figure 7b , Figure 8a , Figure 8b and Figure 9a , Figure 9b As shown.

[0088] Table 2

[0089] The performance indicators include 3dB impulse response width (IRW), peak sidelobe ratio (PSLR), and integral sidelobe ratio (ISLR), as shown in Table 2 (Analysis Table). Simulation results show that the deception jamming signal generated by this invention can guarantee extremely high jamming accuracy, which is basically consistent with the imaging of real point targets by SAR radar.

[0090] The second set of simulation experiments utilizes the method of this invention to deceive and interfere with building targets and forest targets in real-world scenarios, where the real-world scene imaging is as follows: Figure 10 As shown. Figure 11 The results of imaging in SAR radar after mixing the jamming signal implemented by the method of this invention with the echo of the real scene are shown. It can be found that the deceptive jamming signal generated by this invention can effectively preserve the deceptive electromagnetic features such as points, lines, surfaces, and brightness of the false scene when countering SAR with a large oblique angle, achieving a realistic deception effect.

[0091] like Figure 12 As shown, the present invention also provides a high-precision jamming device for non-linear SAR based on an inverter, comprising the following modules:

[0092] 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 backscattering coefficient, generate the SAR jamming frequency response function of the straight track and convert it to the two-dimensional time domain to obtain the straight track initialization input signal.

[0093] The azimuth phase construction module constructs the range spatially variable component phase of the input signal for the straight-line track initialization in the two-dimensional time domain, converts it to the range frequency domain for range inverse matched filtering, and constructs the range frequency modulation term and azimuth phase at the scale of the non-straight-line track.

[0094] The range-space-variable component non-linear track SAR interference frequency response function generation module performs inverse-scale transformation on the range-direction frequency modulation term and azimuth-direction phase of the non-linear track scale, and generates the range-space-variable component non-linear track SAR interference frequency response function through range compression of the linear track scale.

[0095] The module for forming the frequency response function of non-linear SAR interference related to false scenes compensates for the trajectory offset term of the spatially variable component of the non-linear SAR interference frequency response function of the range in the range frequency domain, thereby obtaining the frequency response function of non-linear SAR interference related to false scenes.

[0096] The modulation module multiplies the jamming frequency response function related to the jammer with the non-linear trajectory SAR jamming frequency response function related to the false scene to obtain the non-linear trajectory SAR jamming frequency response function, which is then convolved and modulated with the intercepted SAR signal before being forwarded to the SAR.

[0097] The present invention also 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 steps of the above-described high-precision jamming method for non-linear SAR tracks based on inverted targets.

[0098] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the above-described high-precision jamming method for non-linear SAR tracks based on inverted targets.

[0099] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, 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 storage, CD-ROM, optical storage, etc.) containing computer-usable program code. The solutions in the embodiments of the present invention can be implemented using various computer languages, such as the object-oriented programming language Java and the interpreted scripting language JavaScript.

[0100] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0101] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0102] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0103] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0104] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A high-precision jamming method for non-linear SAR tracks based on inverted targets, characterized in that, Includes the following steps: Step 1: The jammer detects the platform, antenna, and signal parameters of the SAR radar. It selects a SAR image template with complex backscattering coefficients, generates a straight-track SAR jamming frequency response function, and transforms it to the two-dimensional time domain to obtain the straight-track initialization input signal, including: Based on the requirements of the interference target, select a component with a complex backscattering coefficient. The SAR image template is used to generate a straight-track SAR interference frequency response function; a straight-track SAR interference frequency response function related to false scenes is also generated. ;in, For radar antenna and point under straight flight path The shortest slope distance between them For the range frequency axis, The orientation is along a slower time axis; Let P be the x-coordinate of point P; point P is the target. The frequency response function of SAR interference related to the false scene is transformed to the two-dimensional time domain to obtain the initial input signal of the straight track. ;in, For distance, the time axis is fast; Step 2: Initialize the input signal for a straight-line trajectory in the two-dimensional time domain to construct the range-space-varying phase component, transform it to the range-frequency domain, perform range inverse matched filtering, and construct the range-direction frequency modulation term and azimuth-direction phase at the non-straight-line trajectory scale, including: Step 2.1: Construct the range-space-varying phase component based on the input signal for the straight-line trajectory initialization. ; Step 2.2: Convert the phase-constructed input signal to the range frequency domain for inverse range matched filtering, construct a range-direction frequency modulation term at the non-linear trajectory scale, and build the inverse matched filter function. This allows us to obtain the range-direction frequency modulation term and azimuth-direction phase under a non-linear trajectory scale. ; Step 3: Perform inverse scaling transformation on the range-direction frequency modulation term and azimuth-direction phase of the non-linear track scale, and form the non-linear track SAR interference frequency response function with range spatial variation component by range compression of the straight track scale. Step 4: Compensate for the trajectory offset term of the scene spatial invariant component of the non-linear SAR interference frequency response function of the range spatial variable component in the range frequency domain to obtain the non-linear SAR interference frequency response function related to the false scene. Step 5: Multiply the jamming frequency response function related to the jammer with the non-linear trajectory SAR jamming frequency response function related to the false scene to obtain the non-linear trajectory SAR jamming frequency response function, and then convolve and modulate it with the intercepted SAR signal before forwarding it to the SAR.

2. The high-precision jamming method for non-linear SAR tracks based on inverted targets according to claim 1, characterized in that, In step 1, the SAR platform parameters include flight speed. Instantaneous slant range under ideal straight SAR trajectory .

3. The high-precision jamming method for non-linear SAR tracks based on inverted targets according to claim 1, characterized in that, Step 3 includes: Step 3.1, using the inverse scaling function Transform the non-linear trajectory scale into a straight trajectory scale; Step 3.2, using the scale-matched filter function for straight-line tracks. After removing the range-modulated term, the non-linear SAR interference frequency response function of the range-space-varying component is obtained. .

4. The high-precision jamming method for non-linear SAR based on inverted beacons according to claim 3, characterized in that, Step 4 includes: By compensating for the trajectory offset term of the scene-space-invariant component of the non-linear SAR interference frequency response function in the range frequency domain for the range-space-variant component, the non-linear SAR interference frequency response function related to the false scene is obtained. .

5. A high-precision jamming method for non-linear SAR tracks based on an inverter-driven target, as described in claim 1, is characterized in that... Step 5 includes: Step 5.1, the jamming frequency response function related to the jammer. Frequency response function of non-linear SAR interference associated with fake scenarios Multiplying yields the SAR interference frequency response function for non-linear tracks. ; Step 5.2, receive the intercepted SAR signals Frequency response function of SAR interference with non-linear flight paths Frequency domain convolution operation is performed to obtain the forwarding interference signal. ; in, For distance to inverse Fourier transform, For distance to Fourier transform, To intercept and store one-way SAR signals for the receiver.

6. A high-precision jamming device for non-linear SAR based on an inverter-driven 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 a SAR image template with complex backscattering coefficients, generate a straight-track SAR jamming frequency response function, and convert it to the two-dimensional time domain to obtain the straight-track initialization input signal, including: Based on the requirements of the interference target, select a component with a complex backscattering coefficient. The SAR image template is used to generate a straight-track SAR interference frequency response function; a straight-track SAR interference frequency response function related to false scenes is also generated. ;in, For radar antenna and point under straight flight path The shortest slope distance between them For the range frequency axis, The orientation is along a slower time axis; Let P be the x-coordinate of point P; point P is the target. The frequency response function of SAR interference related to the false scene is transformed to the two-dimensional time domain to obtain the initial input signal of the straight track. ;in, For distance, the time axis is fast; The azimuth phase construction module constructs range-space-varying phase components from the input signal used for initializing a straight-line trajectory in the two-dimensional time domain. It then converts this to the range-frequency domain for inverse range-matched filtering, constructing the range-frequency modulation term and azimuth phase at the non-straight-line trajectory scale, including: Step 2.1: Construct the range-space-varying phase component based on the input signal for the straight-line trajectory initialization. ; Step 2.2: Convert the phase-constructed input signal to the range frequency domain for inverse range matched filtering, construct a range-direction frequency modulation term at the non-linear trajectory scale, and build the inverse matched filter function. This allows us to obtain the range-direction frequency modulation term and azimuth-direction phase under a non-linear trajectory scale. ; The range-space-variable component non-linear track SAR interference frequency response function generation module performs inverse-scale transformation on the range-direction frequency modulation term and azimuth-direction phase of the non-linear track scale, and generates the range-space-variable component non-linear track SAR interference frequency response function through range compression of the linear track scale. The module for forming the frequency response function of non-linear SAR interference related to false scenes compensates for the trajectory offset term of the spatially variable component of the non-linear SAR interference frequency response function of the range in the range frequency domain, thereby obtaining the frequency response function of non-linear SAR interference related to false scenes. The modulation module multiplies the jamming frequency response function related to the jammer with the non-linear trajectory SAR jamming frequency response function related to the false scene to obtain the non-linear trajectory SAR jamming frequency response function, which is then convolved and modulated with the intercepted SAR signal before being forwarded to the SAR.

7. 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, it implements the steps of a high-precision jamming method for non-linear SAR tracks based on inverted targets as described in any one of claims 1 to 5.

8. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps of a high-precision jamming method for non-linear SAR tracks based on inverted targets as described in any one of claims 1 to 5.

Images