A SAR Sea Surface Scene Deception Jamming Method and System

Abstract

The present invention discloses a method and system for SAR sea surface scene deception jamming, belonging to the technical field of synthetic aperture radar countermeasure. The method includes: establishing a sea surface scene scattering template and a velocity field template; equally frequency discretely grouping the radial velocity field of the sea surface scene to form scattering sub-templates; in the off-line interference stage, performing scattering intensity projection and two-dimensional Fourier transform on each scattering sub-template in sequence; in the interference initialization stage, processing the data in the off-line stage corresponding to each scattering sub-template in sequence to generate corresponding jammer frequency response sub-functions; in the interference real-time stage, combining the total jammer frequency response function, performing convolution based on the intercepted SAR signal and the total jammer frequency response function to generate the final interference signal to be relayed. The present invention not only ensures the real-time modulation ability of the interference, but also enhances the authenticity and accuracy of the sea surface scene interference result, providing support for the engineering application of SAR sea surface scene deception jamming.

Description

Technical Field

[0001] The present invention belongs to the technical field of synthetic aperture radar (SAR) countermeasure, and particularly relates to a method and system for deceptive jamming of SAR sea surface scenes. Background Art

[0002] Synthetic Aperture Radar (SAR) is a kind of microwave remote sensing imaging radar, which has many advantages such as all-weather, all-day, wide imaging range and high resolution, and is widely used in geological exploration, sea surface remote sensing, reconnaissance and monitoring and other fields. With the popularization of SAR technology in the reconnaissance field, the interference technology against SAR has become increasingly important.

[0003] SAR deceptive jamming is an important part of SAR jamming technology. Its core lies in modulating the interference template and actively transmitting a false target echo signal that has been modulated or processed to the SAR system, resulting in the generation of false targets. At present, the research on SAR deceptive jamming mainly focuses on land scenes, and the scattering mechanism and motion characteristics of these scenes are relatively simple.

[0004] However, there are significant differences between sea surface scenes and land scenes.

[0005] Existing SAR deceptive jamming does not fully consider the complex velocity field information of the sea surface scene interference template itself. The current deceptive jamming methods usually directly use the backscattering information of the scene as the interference template, or simply add velocity information such as uniform motion or uniform acceleration to the template. However, the scattering characteristics and sea surface velocities of many sea surface scenes are more complex and changeable, and these velocity distributions usually exist in the form of a complex velocity field. If the interference modulation does not consider the velocity field information, it will significantly affect the authenticity of the interference result.

[0006] When existing SAR deceptive jamming jointly modulates the sea surface scene scattering information and the velocity field information, the computational complexity is too high. The existing SAR deceptive jamming algorithms mainly modulate static scenes, or can only modulate a single interference template with a fixed velocity value successively. However, the velocity fields of many sea surface scenes are complex and have spatial variability, and the velocity values in different regions are significantly different. Modulating by traversing each velocity value will significantly increase the time cost of the interference.

[0007] Due to the above characteristics, the current SAR deceptive jamming methods for sea surface scenes still face great technical gaps and challenges. Summary of the Invention

[0008] To solve the above technical problems, the present invention provides a method and system for deceptive interference in SAR sea surface scenes. In terms of improving the authenticity of the interference template for the SAR sea surface scene, based on simulation or measured data, a scattering template and a velocity field template of the sea surface scene are constructed simultaneously, so that each scattering template of the sea surface scene is matched with its corresponding velocity field template. At the same time, the electromagnetic scattering characteristics and complex motion characteristics of the sea surface scene are considered, and the interference template is closer to the real sea surface scene. In terms of reducing the complexity of the interference process, the approximately continuous velocity field of the sea surface scene is discretely grouped, reducing the computational amount required for interference modulation, while maintaining the authenticity of the sea surface scene, and solving the problem of high complexity in the interference modulation process of the sea surface scene in the prior art.

[0009] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0010] In the first aspect, the present invention provides a method for deceptive interference in SAR sea surface scenes, including the following steps:

[0011] Step 1, establish a scattering template and a velocity field template of the sea surface scene, which are used together as a deceptive interference modulation template;

[0012] Step 2, perform equal-frequency discrete grouping on the radial velocity field of the sea surface scene, map each velocity interval after grouping to the corresponding radial velocity discrete value, and find the scattering units with the same radial velocity discrete value in the scattering template to form a scattering sub-template;

[0013] Step 3, in the interference offline stage, perform scattering intensity projection and two-dimensional Fourier transform on each scattering sub-template in turn;

[0014] Step 4, in the interference initialization stage, process the data in the offline stage corresponding to each scattering sub-template in turn to generate the corresponding interference machine frequency response sub-function;

[0015] Step 5, in the interference real-time stage, superimpose the generated interference machine frequency response sub-functions to obtain the total interference machine frequency response function, and perform convolution based on the intercepted SAR signal and the total interference machine frequency response function to generate the final interference signal to be forwarded.

[0016] In the second aspect, the present invention provides a system for deceptive interference in SAR sea surface scenes, including:

[0017] A template establishment unit, used to establish a scattering template and a velocity field template of the sea surface scene, which are used together as a deceptive interference modulation template;

[0018] A sub-template establishment unit, used to perform equal-frequency discrete grouping on the radial velocity field of the sea surface scene, map each velocity interval after grouping to the corresponding radial velocity discrete value, and find the scattering units with the same radial velocity discrete value in the scattering template to form a scattering sub-template;

[0019] An offline unit, configured to perform scattering intensity projection and two-dimensional Fourier transform on each scatterer template in sequence during the interference offline phase;

[0020] An initialization unit, configured to process the data in the offline phase corresponding to each scatterer template in sequence during the interference initialization phase, and generate a corresponding jammer frequency response sub-function;

[0021] A real-time interference unit, configured to superimpose the generated jammer frequency response sub-functions to obtain a total jammer frequency response function during the interference real-time phase, and perform convolution based on the intercepted SAR signal and the total jammer frequency response function to generate a final interference signal to be forwarded.

[0022] In a third aspect, the present invention provides an electronic device, including: one or more processors; a memory for storing one or more programs; wherein, when the one or more programs are executed by the one or more processors, the one or more processors implement the foregoing SAR sea surface scene deception interference method.

[0023] In a fourth aspect, the present invention provides a computer-readable storage medium, on which executable instructions are stored, and when the instructions are executed by a processor, the processor can implement the foregoing SAR sea surface scene deception interference method.

[0024] The beneficial effects of the present invention are as follows:

[0025] Starting from the differences between the complex sea surface scene and the simple static scene, aiming at the problem that the velocity field of the sea surface scene will affect the results of SAR deception interference, the present invention incorporates both the scattering information of the sea surface scene and the complex velocity field information into the interference template that needs to be modulated for deception interference. At the same time, methods such as actual measurement data or simulation are used to ensure the accuracy of the sea surface scene velocity field information, effectively improving the authenticity of the sea surface scene interference template.

[0026] Based on the discrete grouping of the radial velocity of the sea surface scene, each discretized radial velocity value is traversed, and the corresponding scatterer unit set is determined as the interference sub-template. The interference modulation is performed on the interference sub-template successively, reducing the number of interference modulation times. This not only ensures the real-time modulation ability of the interference, but also enhances the authenticity and accuracy of the interference results of the sea surface scene, providing support for the engineering application of SAR sea surface scene deception interference. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a flowchart of a method for SAR sea surface scene deception interference according to the present invention;

[0028] Figure 2 It is a flowchart of the implementation steps of an embodiment of the present invention;

[0029] Figure 3 Schematic diagram of the scattering result of the vortex scenario;

[0030] Figure 4 Schematic diagram of the radial velocity field of the vortex scenario;

[0031] Figure 5 Schematic diagram of the simulation result of the scattering interference of the vortex scenario without modulating the velocity field template;

[0032] Figure 6 Schematic diagram of the simulation result of the scattering interference of the vortex scenario when modulating the velocity field template. Detailed implementation manners

[0033] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0034] The present invention incorporates the velocity field template into the interference template to be modulated for the deception interference of complex sea surface scenarios. The motion characteristics of many sea surface scenarios are complex. When SAR imaging is affected by its real velocity field, modulating both the scattering information and the velocity field information during deception interference modulation can make the interference result closer to the actual situation.

[0035] In addition, a sea surface scenario velocity field interference template is established based on measured data or simulation methods. The traditional interference template generation method usually ignores the generation of the template velocity field. For sea surface scenarios, an accurate velocity field interference template that conforms to physical laws can be obtained by using measured data inversion or simulation methods.

[0036] Furthermore, the present invention adopts a velocity field discrete grouping method to efficiently modulate the scattering interference template and the velocity field interference template of the sea surface scenario at the same time. The velocity field of the sea surface scenario is approximately continuous, and it is difficult for existing interference algorithms to modulate the sea surface scenario scattering template and the velocity field template in real time at the same time. The present invention discretely groups the radial velocity field of the sea surface scenario, and then traverses and modulates each radial velocity discrete value and its corresponding scattering sub-template to obtain the corresponding interference signal. At the same time, the interference process is divided into three stages: offline, initialization, and real-time modulation, which improves the authenticity of the sea surface scenario interference result while ensuring the real-time nature of the interference modulation.

[0037] Specifically, as Figure 1 shown, the present invention provides a method for SAR sea surface scenario deception interference, which includes the following steps:

[0038] Step 1: Establish a scattering template and a velocity field template for the complex sea surface scenario, and jointly use them as the deception interference modulation template;

[0039] Step 2: Discretely group the equal-frequency of the radial velocity field of the sea surface scenario, map each velocity interval after grouping to the corresponding radial velocity discrete value, find the scattering units with the same radial velocity discrete value in the scattering template to form scattering sub-templates, and find all scattering sub-templates by analogy;

[0040] Step 3: In the interference offline stage, perform scattering intensity projection and two-dimensional Fourier transform on the sea surface scene scatterer templates with the same discrete radial velocity values in sequence.

[0041] Step 4: In the interference initialization stage, perform operations such as interpolation and multiplication with the reference function on the data in the offline stage corresponding to all the sea surface scene scatterer templates in sequence to generate the corresponding jammer frequency response sub-functions.

[0042] Step 5: In the interference real-time modulation stage, superimpose the generated jammer frequency response sub-functions to obtain the total jammer frequency response function, and perform convolution based on the intercepted SAR signal and the total jammer frequency response function to generate the final interference signal to be relayed.

[0043] Furthermore, when discretely grouping the sea surface scene velocity field template, in addition to using the equal-frequency discrete grouping method, methods such as equidistant grouping and clustering-based grouping can also be used.

[0044] The specific implementation flowchart of the present invention is as Figure 2 shown, and the specific steps are as follows:

[0045] In order to implement SAR deception interference on the sea surface scene, it is first necessary to construct a highly realistic sea surface scene interference template. Different from the deception interference template of the land stationary scene, the deception interference template of the complex sea surface scene includes both the scatterer template and the velocity field template.

[0046] The scatterer template and the velocity field template required for the sea surface scene deception interference are obtained through methods such as actual measurement data acquisition or laboratory simulation. According to the actual measurement data, the scattering information of the sea surface scene is obtained based on methods such as radiometric calibration, and the velocity field information is obtained based on methods such as Doppler frequency shift or along-track interferometry; in the simulation method, the geometric model and the velocity field template of the sea surface scene are obtained based on the hydrodynamic simulation method (such as the Navier-Stokes equation, CFD simulation, etc.), and the corresponding scatterer template is generated based on the electromagnetic scattering modeling method (such as the two-scale electromagnetic scattering model, the small slope approximation electromagnetic scattering model, etc.). Through these methods, the interference templates under different environmental parameters and target parameters can be flexibly obtained according to specific application requirements, providing a rich and realistic selection of interference templates for SAR sea surface scene deception interference.

[0047] When interfering with spaceborne SAR, the azimuth velocity of the sea surface scene is very small compared to the SAR movement velocity. Therefore, it can be approximately considered that the azimuth velocity of the sea surface scene is 0, and the radial velocity of the sea surface scene has a greater impact on the sea surface scene characteristics in SAR imaging.

[0048] Obtain the approximately continuous radial velocity field of the sea surface scene according to the geometric relationship between the sea surface scene and SAR . To this end, first construct a histogram of the radial velocity field of the sea surface scene. Assume that the number of equal-frequency discrete groups set for the radial velocity field is , and the size of each velocity interval is . Among them, , and the minimum velocity in the radial velocity field is . Then, the velocity interval of the th group after equal-frequency discrete grouping is , where , and . Map all the radial velocities within the velocity interval of the th group to the central velocity value of this interval as the discrete value of the radial velocity of this velocity interval. In this way, the approximately continuous radial velocity field is transformed into multiple discrete velocity intervals through equal-frequency discretization processing. The velocity value within each interval is represented by the central velocity of this interval, thus completing the discretization of the radial velocity field.

[0049] After the equal-frequency discrete grouping of the radial velocity, find the set of scattering cells in the scattering template with the discrete value of the radial velocity being , which is called the scattering sub-template , where , represents the spatial coordinates of the scattering cell in the sea surface scene under the ground reference plane. During the SAR interference modulation process, the sea surface scene scattering sub-template with the discrete value of the radial velocity is modulated sequentially or in parallel to obtain the corresponding interference signal. Compared with not performing the velocity field discrete grouping, the number of sequential modulations can be significantly reduced. At the same time, the SAR interference modulation process is divided into three parts: the offline stage, the initialization stage, and the real-time stage.

[0050] In the offline stage, traverse the scattering sub-template with the discrete value of the radial velocity, and map from the ground reference plane to the SAR imaging plane to obtain , where is the fast time in the range direction, is the slow time in the azimuth direction, and multiply by to obtain the scattering intensity projection as:

[0051] (1)

[0052] Among them, , is the time delay at the relative reference distance of the interference template, is the radar carrier frequency, is the scattering sub-template ​​The nearest slant range from the scatter point to the SAR, where c is the speed of light, is the reference slant range, and is the azimuth time when the wave number center irradiates the scatter point of the scatterer template. Then project the scattering intensity to perform a two-dimensional Fourier transform to obtain:

[0053] (2)

[0054] In the formula, represents the range frequency before mapping, represents the azimuth frequency after mapping. In the offline stage, traverse all scatterer interference templates with the same discrete values of radial velocity and repeat the above operations. At this time, the jammer only needs to know the approximate parameters of the SAR.

[0055] In the initialization stage, that is, after obtaining the relatively accurate motion parameters and signal parameters of the SAR system through the reconnaissance system, traverse the discrete values of radial velocity and their corresponding scatterer templates , and use the Stolt interpolation with velocity modulation to simulate the residual azimuth phase, residual range migration, and range-azimuth coupling of the false scene, etc. After Stolt interpolation, the relationship between the range frequency and the range frequency before interpolation is:

[0056] (3)

[0057] Among them, is the effective velocity of the jammed SAR, and are intermediate variables, , . After Stolt interpolation, the signal is:

[0058] (4)

[0059] Multiply the signal after Stolt interpolation with the reference function to complete the autofocus. The reference function and the two-dimensional spectrum of the interference signal at this time are respectively:

[0060] (5)

[0061] (6)

[0062] For simplicity of derivation, the envelope functions in the range and azimuth directions in the reference function are ignored here. For the two-dimensional spectrum of the interference signal Perform azimuth inverse Fourier transform, and multiply the result after the transform by the jammer-related term , where the jammer-related term is:

[0063] (7)

[0064] where represents the slant range between the jammer and the jammed SAR. After multiplication, the discrete value of the modulated radial velocity is the scatterer template and the required jammer frequency response sub-function at and its corresponding scatterer template Repeat the above operations for each discrete value of the radial velocity. If the relevant SAR parameters are known in advance, the operations in the above initialization stage can also be completed in the offline stage.

[0065] In the real-time modulation stage, superimpose all the jammer frequency response sub-functions to obtain the total jammer frequency response function . The jammer repeatedly receives the SAR radar signal , After range FFT, multiply it by the jammer system frequency response function and perform IFFT to obtain the signal to be retransmitted after jamming , that is:

[0066] (8)

[0067] At this time, without increasing the real-time interference modulation time, the sea surface scene scattering template and the velocity field template can be modulated simultaneously, taking into account the influence of the sea surface scene velocity on the imaging result in SAR imaging, and a more realistic sea surface scene interference result can be obtained.

[0068] On the other hand, the present invention provides a SAR sea surface scene deception interference system, and each unit included therein can implement each step of the foregoing method. The system includes:

[0069] A template establishment unit for establishing a sea surface scene scattering template and a velocity field template, which are jointly used as a deception interference modulation template;

[0070] A sub-template establishment unit for equally frequency discretely grouping the sea surface scene radial velocity field, mapping each velocity interval after grouping to a corresponding discrete value of the radial velocity, and finding the scattering units with the same discrete value of the radial velocity in the scattering template to form a scatterer sub-template;

[0071] An offline unit, which is used to perform scattering intensity projection and two-dimensional Fourier transform on each scatterer template in sequence during the interference offline phase;

[0072] An initialization unit, which is used to process the data in the offline phase corresponding to each scatterer template in sequence during the interference initialization phase, and generate a corresponding jammer frequency response sub-function;

[0073] A real-time interference unit, which is used to superimpose the generated jammer frequency response sub-functions to obtain the total jammer frequency response function during the interference real-time phase, and perform convolution based on the intercepted SAR signal and the total jammer frequency response function to generate the final interference signal to be forwarded.

[0074] Embodiment

[0075] As Figure 2 shown, the present invention can be effectively applied to the research on SAR deception interference in sea surface scenes. For common complex sea surface scenes in SAR images, such as scenes with significant features like vortices, internal waves, ships and their wakes, etc., it can achieve accurate and efficient interference effects. Taking the sea surface vortex scene as an example, the application potential and actual effect of the present invention in SAR sea surface scene deception interference are demonstrated.

[0076] In this example, a simulation method is used to construct a complex sea surface vortex scene deception interference template. Based on hydrodynamic simulation and electromagnetic scattering modeling, the scattering results and radial velocity field of the vortex scene are obtained respectively (as Figure 3 and Figure 4 shown). Using electromagnetic scattering modeling to calculate the scattering value of the vortex scene can not only obtain a more accurate backscattering interference template, but also this template is more in line with the actual law. It can be seen from Figure 4 that the vortex scene has a relatively complex velocity field. The velocity magnitude and direction are different in different vortex regions, and the velocity can reach up to . The azimuthal offset and ambiguity of the scatter points brought by the radial velocity field will affect the SAR imaging result. Therefore, when the jammer modulates the vortex scene interference template, the influence brought by the complex velocity field must be fully considered.

[0077] Based on the Sentinel-1 original echo data, the modulation simulation of the interference signal is carried out. During the interference modulation process, if the vortex velocity field is ignored and only the vortex scattering interference template is modulated, the obtained interference simulation result is as Figure 5 shown. Suppose the size of the vortex scene interference template is . To improve the interference effect and take into account the calculation efficiency, the vortex radial velocity field is discretely grouped. The velocity field template is divided into groups. Usually .

[0078] Traverse the discretized vortex radial velocity, for each vortex and each discrete value of the radial velocity Find the corresponding set of scattering units, and sequentially or in parallel for the vortex scenario scatterer template with the discrete value of the radial velocity Modulate to obtain the corresponding interference signal. After traversing times and finishing, add all the interference signals to obtain the final interference signal, and the interference result is as shown. It should be noted that if the vortex velocity is considered during the interference process but the vortex velocity field is not discretized, then the interference modulation process almost needs to be repeated Figure 6 times. At this time, it will pose a very high requirement for the complexity of the jammer, and the interference modulation time cannot meet the real-time requirement of SAR deception jamming. When not considering the vortex velocity field, as

[0079] shown, the shape of the vortex is relatively standardized, and the difference between the interference result and the texture of the surrounding sea wave background is large, making it difficult to effectively blend into the overall complex sea surface background, resulting in a poor authenticity of the interference result. On the contrary, after considering the vortex velocity field, as Figure 5 shown, the shape of the vortex is more natural, the interference effect is closer to the shape of the vortex in the real SAR image, and at the same time meets the requirements of the actual application for the interference modulation time. Thus, taking the complex sea surface vortex scenario as an example, the verification of the SAR sea surface scenario deception jamming method is completed. Figure 6 Shown, the shape of the vortex is more natural, the interference effect is closer to the shape of the vortex in the real SAR image, and at the same time meets the requirements of the actual application for the interference modulation time. Thus, taking the complex sea surface vortex scenario as an example, the verification of the SAR sea surface scenario deception jamming method is completed.

[0080] In a third aspect, the present invention provides an electronic device, including: one or more processors; a memory for storing one or more programs; wherein, when the one or more programs are executed by the one or more processors, the one or more processors are caused to implement the foregoing SAR sea surface scenario deception jamming method.

[0081] In a fourth aspect, the present invention provides a computer-readable storage medium, on which executable instructions are stored, and when the instructions are executed by a processor, the processor can be caused to implement the foregoing SAR sea surface scenario deception jamming method.

[0082] The specific embodiments described above further elaborate on the purpose, technical solutions, and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for SAR sea surface scene deception jamming, characterized in that, It includes the following steps: Step 1: Establish a sea surface scene scattering template and a velocity field template, which are jointly used as a deception interference modulation template; Step 2: Perform equal-frequency discrete grouping on the radial velocity field of the sea surface scene, map each velocity interval after grouping to the corresponding radial velocity discrete value, and find the scattering units with the same radial velocity discrete value in the scattering template to form a scattering sub-template; Step 3: In the interference offline stage, perform scattering intensity projection and two-dimensional Fourier transform on each scattering sub-template in sequence; Step 4: In the interference initialization stage, process the data in the offline stage corresponding to each scattering sub-template in sequence to generate the corresponding interference machine frequency response sub-function; Step 5: In the interference real-time stage, superimpose the generated interference machine frequency response sub-functions to obtain the total interference machine frequency response function, and perform convolution based on the intercepted SAR signal and the total interference machine frequency response function to generate the final interference signal to be forwarded.

2. The SAR sea surface scene deception jamming method according to claim 1, characterized in that In the above Step 1, the scattering template and velocity field template required for sea surface scene deception interference are obtained through measured data acquisition or laboratory simulation methods. Among them, if obtained through measured data acquisition, the scattering information of the sea surface scene is obtained based on the radiometric calibration method, and the velocity field information is obtained based on the Doppler frequency shift or along-track interferometry method; if obtained through the simulation method, the geometric model and velocity field template of the sea surface scene are obtained based on the hydrodynamic simulation method, and the corresponding scattering template is generated based on the electromagnetic scattering modeling method.

3. A method for SAR sea surface scene deception interference according to claim 1, characterized in that, In the step 2, a histogram of the radial velocity field of the sea surface scene is constructed. Let the number of equal-frequency discrete groups of the radial velocity field be , and the size of each velocity interval be , where , the minimum velocity in the radial velocity field is . Then, the velocity interval of the -th group after equal-frequency discrete grouping is , where , and . Map all the radial velocities within the velocity interval of the -th group to the central velocity value of the -th group velocity interval .

4. A method for SAR sea surface scene deception jamming according to claim 3, characterized in that, In the above step 2, after the equal-frequency discretization grouping of the radial velocity field, find the set of scattering cells in the scattering template where the discrete value of the radial velocity is the central velocity value and denote it as the sub-scattering template , where , represents the spatial coordinates of the scattering cell in the sea surface scene under the ground reference plane.

5. A method for SAR sea surface scene deception interference according to claim 4, characterized in that, In step 3, during the interference offline phase, the radial velocity discrete value is the central velocity value. Scatter template , the scattering template Mapping from the ground reference plane to the SAR imaging plane ,in For distance to fast time, is the azimuth slow time, and multiplied by Get the scattered intensity projection, where is the time delay of the interference template relative to the reference distance, is the radar carrier frequency, and the scattering intensity projection is subjected to a two-dimensional Fourier transform.

6. A method for SAR sea surface scene deception jamming according to claim 5, characterized in that, In step 4, during the interference initialization phase, traverse the interval with the radial velocity discrete value as the central velocity value and the corresponding scatterer template , and use the Stolt interpolation with velocity modulation to simulate the residual azimuth phase, residual range migration, and range-azimuth coupling of the false scene; Complete the phase focusing by multiplying the signal after Stolt interpolation with the reference function; Perform azimuth inverse Fourier transform on the two-dimensional spectrum of the interference signal, multiply the result after the transform by the interference machine related term, and obtain the discrete value of the modulated radial velocity as the central velocity value of the scatterer template The required interference machine frequency response sub-function.

7. A method for SAR sea surface scene deception interference according to claim 1, characterized in that In the above Step 5, in the interference real-time stage, superimpose all the interference machine frequency response sub-functions to obtain the total interference machine frequency response function. The interference machine repeatedly receives the SAR radar signal. After the range FFT of the SAR radar signal, it is convolved and multiplied with the total interference machine frequency response function and then IFFT is performed to obtain the interference signal to be forwarded.

8. A SAR sea surface scene deception jamming system, characterized in that It includes: A template establishment unit for establishing a sea surface scene scattering template and a velocity field template, which are jointly used as a deception interference modulation template; A sub-template establishment unit for performing equal-frequency discrete grouping on the radial velocity field of the sea surface scene, mapping each velocity interval after grouping to the corresponding radial velocity discrete value, and finding the scattering units with the same radial velocity discrete value in the scattering template to form a scattering sub-template; An offline unit for performing scattering intensity projection and two-dimensional Fourier transform on each scattering sub-template in sequence in the interference offline stage; An initialization unit for processing the data in the offline stage corresponding to each scattering sub-template in sequence in the interference initialization stage to generate the corresponding interference machine frequency response sub-function; A real-time interference unit for superimposing the generated interference machine frequency response sub-functions to obtain the total interference machine frequency response function in the interference real-time stage, and performing convolution based on the intercepted SAR signal and the total interference machine frequency response function to generate the final interference signal to be forwarded.

9. An electronic device, characterized in that, It includes: One or more processors; A memory for storing one or more programs; Wherein, when the one or more programs are executed by the one or more processors, the one or more processors implement a method for SAR sea surface scene deception interference according to any one of claims 1-7.

10. A computer-readable storage medium, characterized in that It stores executable instructions, and when the instructions are executed by a processor, the processor can implement a SAR sea surface scene deception interference method according to any one of claims 1-7.

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