360-degree heavy rail circular track ring video synthetic aperture radar jamming method and system

Abstract

This invention discloses a method and system for jamming 360-degree heavy-orbit circular-track video synthetic aperture radar (SAR). Specifically, it involves: analyzing intercepted enemy single-track signals to obtain enemy radar signal parameters and platform motion parameters; guiding multi-track analysis based on enemy parameters to obtain parameters for different tracks; using a self-deception template to solve for false point coefficients and controlling the size and orientation of the video template to obtain a deception jamming modulation coefficient video library; and generating a heavy-orbit-specific deception strategy based on the reconnaissance parameters of different tracks; finally, using the deception jamming modulation coefficient video library and the heavy-orbit-specific deception strategy to generate and modulate a deception signal, obtaining a track-by-track forwarding azimuth-elevation joint deception jamming signal to jam the enemy track by track, achieving the deception effect. This invention achieves the purpose of deception jamming of a 360-degree heavy-orbit circular-track videoSAR system, with the advantage of simultaneously performing heavy-orbit jamming and azimuth-elevation joint deception.

Description

Technical Field

[0001] This invention relates to the field of 360-degree heavy-track circular track annular video synthetic aperture radar jamming and countermeasure technology, and in particular to a 360-degree heavy-track circular track annular video synthetic aperture radar jamming method and system. Background Technology

[0002] Synthetic Aperture Radar (SAR) can reflect the microwave scattering characteristics and field-of-view information of a target, enabling radar sensors to image, detect, and interpret targets. The development of all-weather, all-time SAR technology has laid the foundation for microwave remote sensing technology, achieving Earth observation with resolutions ranging from meters to sub-centimeter levels. Currently, SAR observation channels are evolving from single-channel to multi-channel, channel configurations from linear to intersecting linear and curved surfaces, and aperture manifolds from linear to curved and planar, and further towards a three-dimensional structure with interwoven multiple curves.

[0003] As microwave remote sensing technology has evolved from static images to dynamic video, researchers have invented a novel Video Synthetic Aperture Radar (VideoSAR) technology. Due to its high frame rate and high-resolution imaging capabilities, VideoSAR systems can continuously illuminate and accumulate data on dynamic regions of interest using imaging channels and aperture manifolds, acquiring sequences of tens or even hundreds of thousands of ground feature images. When played back continuously, these images rival the dynamic display effects of optical video. Under this new imaging paradigm, the 360-degree re-orbit circular track VideoSAR mode for wide-area surveillance and reconnaissance can periodically adjust the ground position of the beam scan, thereby extending the region's perimeter. Its re-orbit mechanism reveals more spatial characteristics than single-channel or multi-channel techniques and can be applied to differential interferometry and tomography.

[0004] With the widespread application of new-generation VideoSAR reconnaissance technology, there is an urgent need to adopt electronic countermeasures and jamming measures to weaken and disrupt enemy VideoSAR reconnaissance. Existing countermeasures all employ suppression and deception jamming techniques, and most are aimed at single SAR images, different signal waveform types, multi-channel configurations, array SAR, and degrees of freedom. Invention patent CN114609598B discloses a synthetic aperture radar (SAR) scene deception jamming method based on image inversion. First, SAR image inversion preprocessing is performed, SAR image jamming scene is set, and SAR image inversion template complex data is generated; then, the CS inversion algorithm is used to invert the image to the echo, azimuth phase inversion, range phase, SRC and consistent RCMC inversion, and redundant RCMC inversion; finally, jamming data is generated. Chinese patent CN117496000B discloses a method and apparatus for generating an interference template image. The method involves: acquiring a background sample image from a preset background sample image library; generating a background template image composed of several pixel blocks to be processed using a preset noise processing model based on a preset interference template image size; determining a first neighborhood matrix corresponding to the current pixel block to be processed in the background template image using a preset neighborhood matrix model; determining several second neighborhood matrices with the same matrix attribute parameters as the first neighborhood matrix in the background sample image using the preset neighborhood matrix model; calculating the distance value between the first neighborhood matrix and each second neighborhood matrix using a preset distance calculation model to determine the target pixel block corresponding to the second neighborhood matrix in the background sample image that has the smallest distance value correspondence with the first neighborhood matrix; updating the color parameters of the current pixel block to be processed based on the color parameters of the target pixel block; and obtaining a first interference template image for deceiving and jamming synthetic aperture radar when the color parameters of the pixel block to be processed in the background template image are updated. Traditional jamming methods such as single-frame SAR, multi-channel SAR, and frequency-controlled array SAR are not specifically designed for VideoSAR systems or for the 360-degree heavy orbit circular track VideoSAR imaging mode. Therefore, it is urgent to research a deception jamming method and countermeasure strategy for 360-degree heavy orbit circular track VideoSAR to meet the need for deception jamming of the 360-degree heavy orbit circular track VideoSAR system. Summary of the Invention

[0005] The purpose of this invention is to provide a 360-degree heavy-track circular band video synthetic aperture radar jamming method and system, which is a radar jamming method to confuse and disrupt the enemy's combat capabilities with false targets.

[0006] The technical solution to achieve the purpose of this invention is: a 360-degree heavy-track circular band video synthetic aperture radar jamming method, comprising the following steps:

[0007] Step 1: Intercept the enemy's 360-degree heavy orbit circular track ring radar signal in the first single track of VideoSAR;

[0008] Step 2: Analyze the enemy's first single-track VideoSAR radar signal to obtain the enemy's single-track VideoSAR signal parameters and platform motion parameters;

[0009] Step 3: Based on the enemy's single-track VideoSAR signal parameters and platform motion parameters, guide multi-track analysis to obtain reconnaissance parameters for different tracks;

[0010] Step 4: Use our own 360-degree heavy orbit circular track spotting VideoSAR spoofing template to solve for the false point coefficients, and control the size and orientation of the video template according to the requirements of the target scene to obtain the 360-degree heavy orbit circular track spotting VideoSAR spoofing interference modulation coefficient video library.

[0011] Step 5: Generate a rapid multi-angle jamming strategy for repeated orbits based on the reconnaissance parameters of different orbits, and obtain a targeted deception strategy for repeated orbits of VideoSAR.

[0012] Step 6: Using the 360-degree heavy orbit circular track spotting VideoSAR deception jamming modulation coefficient video library and VideoSAR heavy orbit targeted deception strategy, generate and modulate the 360-degree heavy orbit circular track ring VideoSAR deception signal to obtain the azimuth-elevation joint deception jamming signal relayed on track by track.

[0013] Step 7: Forward the azimuth-elevation joint deception jamming signal track by track to jam the enemy's heavy orbit circular track ring VideoSAR system track by track, thereby achieving the deception effect.

[0014] A 360-degree heavy-track circular track annular video synthetic aperture radar (SAR) jamming system is disclosed. This system is used to implement the aforementioned 360-degree heavy-track circular track annular video SAR jamming method. The system includes a radar signal interception module, a single-track analysis module, a multi-track analysis module, a modulation coefficient video library determination module, a deception strategy generation module, a deception jamming signal generation module, and a jamming module, wherein:

[0015] The radar signal interception module is used to intercept the radar signal of the enemy's 360-degree heavy orbit circular track ring VideoSAR in the first single track.

[0016] The single-track analysis module is used to analyze the enemy's first single-track VideoSAR radar signal to obtain the enemy's single-track VideoSAR signal parameters and platform motion parameters.

[0017] The multi-track analysis module guides multi-track analysis based on the enemy's single-track VideoSAR signal parameters and platform motion parameters to obtain reconnaissance parameters for different tracks;

[0018] The modulation coefficient video library determination module uses the self-made 360-degree heavy orbit circular track spotting VideoSAR deception template to solve for false point coefficients, and controls the size and orientation of the video template according to the target scene requirements to obtain the 360-degree heavy orbit circular track spotting VideoSAR deception interference modulation coefficient video library.

[0019] The deception strategy generation module is used to generate a fast multi-angle interference strategy for repeated orbits based on the reconnaissance parameters of different orbits, and obtain a VideoSAR repeated orbit targeted deception strategy.

[0020] The deception jamming signal generation module uses a 360-degree heavy orbit circular track spotting VideoSAR deception jamming modulation coefficient video library and VideoSAR heavy orbit targeted deception strategy to generate and modulate 360-degree heavy orbit circular track ring VideoSAR deception signal, and obtains azimuth-elevation joint deception jamming signal relayed on track by track.

[0021] The jamming module forwards azimuth-elevation combined deception jamming signals orbit by orbit, jamming the enemy's heavy orbit circular track VideoSAR system orbit by orbit to achieve the deception effect.

[0022] Compared with the prior art, the significant advantages of this invention are: (1) It can deceive and interfere with the 360-degree heavy orbit circular track ring band VideoSAR system, realize the confusion and disruption of the enemy's azimuth-elevation dimension target discrimination with false targets, reduce the probability of the enemy's 360-degree heavy orbit circular track ring band VideoSAR system detecting real targets, reduce the enemy's combat capability, and improve the battlefield survivability of our side; (2) In response to the interference strategy of the 360-degree heavy orbit circular track ring band VideoSAR system, a fast heavy orbit multi-angle interference strategy is proposed. The interference signal can be pre-modulated before the next heavy orbit imaging. Only the height difference and elevation angle need to be updated and modulated. Other parameters do not need to be repeatedly detected and modulated, which reduces the equipment burden and improves the interference efficiency. Attached Figure Description

[0023] Figure 1 This is a flowchart illustrating a 360-degree heavy-track circular band video synthetic aperture radar jamming method according to the present invention.

[0024] Figure 2 This is an example diagram of templates for target 1 and target 2 with different azimuths and depression angles generated by our side using the 360-degree heavy orbit circular trajectory spotting VideoSAR mode in an embodiment of the present invention.

[0025] Figure 3 This is a schematic diagram of the undisturbed 360-degree heavy orbit circular track VideoSAR measurement results in an embodiment of the present invention.

[0026] Figure 4 The following are schematic diagrams showing the results of deception interference with target 1 and target 2 in the embodiments of the present invention, respectively, where (a) is a schematic diagram of the deception interference result of track 1 in scenario 1, (b) is a schematic diagram of the deception interference result of track 2 in scenario 1, (c) is a schematic diagram of the deception interference result of track 1 in scenario 2, and (d) is a schematic diagram of the deception interference result of track 2 in scenario 2.

[0027] Figure 5 The following are schematic diagrams showing the results of deceiving and interfering with targets 1 and 2 using false depression angles in an embodiment of the present invention. (a) is a schematic diagram of the deceiving and interfering results of track 1 (31°), (b) is a schematic diagram of the deceiving and interfering results of track 1 (37°), (c) is a schematic diagram of the deceiving and interfering results of track 1 (45°), (d) is a schematic diagram of the deceiving and interfering results of track 2 (26°), (e) is a schematic diagram of the deceiving and interfering results of track 2 (37°), and (f) is a schematic diagram of the deceiving and interfering results of track 2 (45°). Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0029] Combination Figure 1 The present invention discloses a 360-degree heavy-track circular band video synthetic aperture radar jamming method, comprising the following steps:

[0030] Step 1: Intercept the enemy's 360-degree heavy orbit circular track ring radar signal in the first single track of VideoSAR;

[0031] Step 2: Analyze the enemy's first single-track VideoSAR radar signal to obtain the enemy's single-track VideoSAR signal parameters and platform motion parameters;

[0032] Step 3: Based on the enemy's single-track VideoSAR signal parameters and platform motion parameters, guide multi-track analysis to obtain reconnaissance parameters for different tracks;

[0033] Step 4: Use our own 360-degree heavy orbit circular track spotting VideoSAR spoofing template to solve for the false point coefficients, and control the size and orientation of the video template according to the requirements of the target scene to obtain the 360-degree heavy orbit circular track spotting VideoSAR spoofing interference modulation coefficient video library.

[0034] Step 5: Generate a rapid multi-angle jamming strategy for repeated orbits based on the reconnaissance parameters of different orbits, and obtain a targeted deception strategy for repeated orbits of VideoSAR.

[0035] Step 6: Using the 360-degree heavy orbit circular track spotting VideoSAR deception jamming modulation coefficient video library and VideoSAR heavy orbit targeted deception strategy, generate and modulate the 360-degree heavy orbit circular track ring VideoSAR deception signal to obtain the azimuth-elevation joint deception jamming signal relayed on track by track.

[0036] Step 7: Forward the azimuth-elevation joint deception jamming signal track by track to jam the enemy's heavy orbit circular track ring VideoSAR system track by track, thereby achieving the deception effect.

[0037] As a specific example, the interception of the enemy's 360-degree heavy-track circular band VideoSAR radar signal in the first single track as described in step 1 includes parameters other than the heavy-track height difference and elevation angle. These other parameters include signal waveform type, carrier frequency, frequency modulation slope, pulse repetition frequency, and average velocity.

[0038] As a specific example, the enemy's 360-degree heavy orbit circular track videoSAR mentioned in step 1 is mounted on the enemy's spacecraft, and the radar operates in a 360-degree heavy orbit video circular track imaging mode at different altitude dimensions.

[0039] As a specific example, in step 2, the enemy's first single-track VideoSAR radar signal is analyzed to obtain the enemy's single-track VideoSAR signal parameters and platform motion parameters, as follows:

[0040] The enemy's single-track VideoSAR signal data s(t,t,x,y,i,W) is analyzed. The signal parameters and platform motion parameters corresponding to each frame are generated using the first single-track signal s(t,t,x,y,i,1) to guide the jammer to initially form jamming parameters.

[0041] Where t and t' represent distance time and azimuth time, respectively; x and y represent the azimuth and distance positions of any point in the scene, respectively; i represents the i-th frame, i = 1, 2, ..., K; K represents the total number of frames; and W is a positive integer representing the total number of times the radar observes the double orbit at different altitudes.

[0042] As a specific example, in step 3, multi-track analysis is guided by the enemy's single-track VideoSAR signal parameters and platform motion parameters to obtain reconnaissance parameters for different tracks, as follows:

[0043] Based on the characteristics of the 360-degree heavy-track circular band VideoSAR imaging mode, other parameters besides the heavy-track height difference and pitch angle are obtained by using single-track signal parameters and platform motion parameters.

[0044] For the relevant parameters of multiple heavy orbit imaging flights, it is only necessary to detect and update the altitude difference and pitch angle. The other parameters do not need to be detected and analyzed repeatedly, avoiding the process of multiple detection, identification and analysis. Therefore, the jammer can pre-modulate the jamming signal before the next heavy orbit imaging.

[0045] As a specific example, in step 4, the spoofing coefficients are solved using the proprietary 360-degree double-track circular trajectory spotting VideoSAR spoofing template. The size and orientation of the video template are then controlled according to the target scene requirements to obtain a video library of 360-degree double-track circular trajectory spotting VideoSAR spoofing interference modulation coefficients, as detailed below:

[0046] Step 4.1: Assume there is an ε-jamming machine on the ground located at different positions in a large scene, jamming the enemy system separately. Then, the template composed of backscattering coefficients is obtained by 360-degree heavy-orbit circular trajectory spotting VideoSAR mode imaging. for:

[0047]

[0048] Where, x j and y j These correspond to the azimuth and range positions of the interference template, respectively. These represent the positions corresponding to the orientation of the interfering template pixels. N represents the distance to the corresponding position of the interfering template pixel. a and N r Let θ represent the number of pixels in the azimuth and range directions of the template obtained after imaging in the i-th frame, respectively. i Let be the azimuth angle of the i-th frame. Let be the top angle of the W-th trajectory, and s() represent the corresponding scattering coefficient value;

[0049] Step 4.2: Based on the requirements of the target scene, generate video templates using signal processing methods such as interpolation resampling or frequency domain zero-padding. Size control:

[0050]

[0051] in, This refers to the image domain data of the i-th frame template obtained after imaging; The image domain data of the i-th frame template after size control. and These represent the number of pixels in the orientation and range directions of the i-th frame template after size control;

[0052] Step 4.3: Create video templates based on the requirements of the target scenario. Angle control:

[0053]

[0054] Where, θ rot This refers to the rotation angle of the video template;

[0055] Step 4.4, Video Template After size and angle control, point (x) is made... j ,y j The position of ) is changed to the new position. Video template changed

[0056] As a specific example, in step 5, a rapid multi-angle interference strategy for repeated orbits is generated based on the reconnaissance parameters of different orbits, resulting in a VideoSAR repeated orbit targeted deception strategy, as follows:

[0057] For any ground-based jammer ε, the selectable high-speed heavy rail multi-angle jamming signals are:

[0058]

[0059] The 360-degree heavy orbit circular track VideoSAR deception pattern is selected using the jamming strategy selection switch function Sel(·). The jamming strategies include the following four:

[0060] (1) To achieve the focus-gathering mode based on the circular trajectory of the heavy orbit, the true azimuth angle is used. and a true overhead perspective Interference signals generated by the same azimuth and elevation angle of the heavy rail circular track loop;

[0061] (2) To utilize false azimuth angles in the clustering mode based on the heavy orbit circular trajectory and a true overhead perspective Interference signals generated by the circular track band of the heavy rail at different azimuth angles and the same elevation angle;

[0062] (3) To achieve the focus-gathering mode based on the circular trajectory of the heavy orbit, the true azimuth angle is used. and fake top-down perspective Interference signals generated by the same azimuth angle and different elevation angles in the circular track of the heavy rail;

[0063] (4) To utilize false azimuth angles in the clustering mode based on the heavy orbit circular trajectory and fake top-down perspective Interference signals generated by the circular track band of the heavy rail at different azimuth and pitch angles.

[0064] As a specific example, in step 6, a 360-degree heavy-orbit circular track spotting VideoSAR deception jamming modulation coefficient video library and a VideoSAR heavy-orbit targeted deception strategy are used to generate and modulate a 360-degree heavy-orbit circular track ring-band VideoSAR deception signal, resulting in an azimuth-elevation joint deception jamming signal relayed track by track. The joint deception jamming signal includes the following four types:

[0065] (1) A video library of modulation coefficients for 360-degree double-track circular trajectory spotting VideoSAR deception and jamming was used, along with a targeted deception strategy for double-track VideoSAR. Based on the double-track circular trajectory spotting mode, the true azimuth angle was utilized. and a true overhead perspective The generated interference signals of the heavy rail circular track at the same azimuth and elevation angles are as follows:

[0066]

[0067] Where mod{A,B} represents the signal modulation operation between A and B;

[0068] (2) Using a 360-degree double-track circular trajectory spotting VideoSAR deception jamming modulation coefficient video library and VideoSAR double-track targeted deception strategy, and based on the double-track circular trajectory spotting mode, using false azimuth angles and a true overhead perspective The generated interference signals of the heavy rail circular track loop at different azimuth angles and the same elevation angle are as follows:

[0069]

[0070] (3) Using a 360-degree double-track circular trajectory spotting VideoSAR deception jamming modulation coefficient video library and VideoSAR double-track targeted deception strategy, and based on the double-track circular trajectory spotting mode, utilizing the true azimuth angle and fake top-down perspective The generated interference signals of the heavy rail circular track at the same azimuth angle and different elevation angles are as follows:

[0071]

[0072] (4) Using a 360-degree double-track circular trajectory spotting VideoSAR deception jamming modulation coefficient video library and VideoSAR double-track targeted deception strategy, and based on the double-track circular trajectory spotting mode, using false azimuth angles and fake top-down perspective The generated interference signals of the heavy rail circular track loop at different azimuth and elevation angles are as follows:

[0073]

[0074] As a specific example, in step 7, the azimuth-elevation joint deception jamming signal is forwarded track by track to jam the enemy's heavy-orbit circular track ring VideoSAR system track by track, achieving the deception effect, as detailed below:

[0075] The deception jamming signals of four types of VideoSAR false scenes are forwarded, so that the video deception jamming and the real scene echo signal are simultaneously received by the enemy VideoSAR system, thus achieving the final effect of deception jamming imaging of multiple different orbits and multiple orbits circular track rings of VideoSAR.

[0076] The forwarding of four types of jamming signals and the various choices between different orbits can lead to several combinations for strategic jamming involving azimuth-elevation deception, thereby disrupting the enemy radar's ability to identify targets. For fast double orbit jamming, the jamming signal can be pre-modulated before the next double orbit imaging, requiring only the updating and modulation of its altitude difference and elevation angle, without needing to repeatedly detect and modulate the other parameters.

[0077] This invention also provides a 360-degree heavy-track circular track annular video synthetic aperture radar jamming system. This system is used to implement the aforementioned 360-degree heavy-track circular track annular video synthetic aperture radar jamming method. The system includes a radar signal interception module, a single-track analysis module, a multi-track analysis module, a modulation coefficient video library determination module, a deception strategy generation module, a deception jamming signal generation module, and a jamming module, wherein:

[0078] The radar signal interception module is used to intercept the radar signal of the enemy's 360-degree heavy orbit circular track ring VideoSAR in the first single track.

[0079] The single-track analysis module is used to analyze the enemy's first single-track VideoSAR radar signal to obtain the enemy's single-track VideoSAR signal parameters and platform motion parameters.

[0080] The multi-track analysis module guides multi-track analysis based on the enemy's single-track VideoSAR signal parameters and platform motion parameters to obtain reconnaissance parameters for different tracks;

[0081] The modulation coefficient video library determination module uses the self-made 360-degree heavy orbit circular track spotting VideoSAR deception template to solve for false point coefficients, and controls the size and orientation of the video template according to the target scene requirements to obtain the 360-degree heavy orbit circular track spotting VideoSAR deception interference modulation coefficient video library.

[0082] The deception strategy generation module is used to generate a fast multi-angle interference strategy for repeated orbits based on the reconnaissance parameters of different orbits, and obtain a VideoSAR repeated orbit targeted deception strategy.

[0083] The deception jamming signal generation module uses a 360-degree heavy orbit circular track spotting VideoSAR deception jamming modulation coefficient video library and VideoSAR heavy orbit targeted deception strategy to generate and modulate 360-degree heavy orbit circular track ring VideoSAR deception signal, and obtains azimuth-elevation joint deception jamming signal relayed on track by track.

[0084] The jamming module forwards azimuth-elevation combined deception jamming signals orbit by orbit, jamming the enemy's heavy orbit circular track ring VideoSAR system orbit by orbit to achieve the deception effect.

[0085] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0086] Example

[0087] This embodiment uses two target measured data from a UAV-borne 360-degree heavy orbit circular track spotting mode VideoSAR as video deception templates, and another UAV-borne 360-degree heavy orbit circular track ring VideoSAR measured data as the jamming target, to simulate the UAV-borne VideoSAR measured data of the jammer and the jamming target.

[0088] Figure 2 The examples provided in this embodiment are templates of target 1 and target 2 with different azimuths and depression angles generated by our side using the 360-degree heavy orbit circular trajectory focusing VideoSAR mode. These templates serve as the source for generating the baseline deception templates, and a series of deception templates are generated based on the targets in the image. Figure 3 The data represents the undisturbed 360-degree heavy orbit circular track VideoSAR measurement results in this embodiment, which is the area where deception interference was performed. Figure 4 The results of deception jamming using target 1 and target 2 in this embodiment, focusing on their true azimuth and elevation angles, are shown below. Figure 4 (a) in the diagram is a schematic diagram of the deception interference result of track 1 in scenario 1. Figure 4 (b) in the diagram is a schematic diagram of the deception interference result of track 2 in scenario 1. Figure 4 (c) in the diagram is a schematic diagram of the deception interference results of track 1 in scenario 2. Figure 4 (d) in the diagram is a schematic diagram of the deception interference result of track 2 in scenario 2. Figure 5 The results of deceiving and jamming targets 1 and 2 with false depression angles in this embodiment are shown below. Figure 5 (a) in the diagram is a schematic diagram of the deception interference results for orbit 1 (31°). Figure 5 (b) in the diagram is a schematic diagram of the deception interference results for orbit 1 (37°). Figure 5 (c) in the diagram is a schematic diagram of the deception interference results for orbit 1 (45°). Figure 5 In the diagram, (d) represents orbital 2 (26°). Figure 5 A schematic diagram of the deception interference results for orbit (e) 2 (37°). Figure 5 (f) in the diagram is a schematic diagram of the deception interference results of orbit 2 (45°).

[0089] from Figure 4 , Figure 5 It can be seen that the method proposed in this invention can achieve rapid re-orbit interference and azimuth-elevation joint deception interference of 360-degree re-orbit circular track loop VideoSAR dynamic video. The imaging results after deception interference show that the method of this invention can achieve targeted re-orbit interference performance.

[0090] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for jamming 360-degree heavy-track circular track ring-band video synthetic aperture radar, characterized in that, Includes the following steps: Step 1: Intercept the enemy's 360-degree heavy orbit circular track ring radar signal in the first single track of VideoSAR; Step 2: Analyze the enemy's first single-track VideoSAR radar signal to obtain the enemy's single-track VideoSAR signal parameters and platform motion parameters; Step 3: Based on the enemy's single-track VideoSAR signal parameters and platform motion parameters, guide multi-track analysis to obtain reconnaissance parameters for different tracks; Step 4: Use our own 360-degree heavy orbit circular track spotting VideoSAR spoofing template to solve for false point coefficients, and control the size and orientation of the video template according to the target scene requirements to obtain a 360-degree heavy orbit circular track spotting VideoSAR spoofing interference modulation coefficient video library. Step 5: Generate a rapid multi-angle jamming strategy for repeated orbits based on reconnaissance parameters from different orbits, and obtain a targeted deception strategy for VideoSAR repeated orbits, as follows: For any ground jammer The selectable high-speed heavy rail multi-angle interference signals are: ； Selecting the switching function using interference strategies The following four jamming strategies were selected for the 360-degree heavy orbit circular track band VideoSAR deception pattern: (1) To achieve beamforming based on the heavy-orbit circular trajectory, the true azimuth angle is used. and a true overhead perspective Interference signals generated by the same azimuth and elevation angle of the heavy rail circular track loop; (2) To utilize false azimuth angles in the clustering mode based on the heavy orbit circular trajectory and a true overhead perspective Interference signals generated by the circular track band of the heavy rail at different azimuth angles and the same elevation angle; (3) To achieve the focus-gathering mode based on the circular trajectory of the heavy orbit, the true azimuth angle is used. and fake top-down perspective Interference signals generated by the same azimuth angle and different elevation angles in the circular track of the heavy rail; (4) To utilize false azimuth angles in the clustering mode based on the heavy orbit circular trajectory and fake top-down perspective The generated heavy rail circular track interference signals at different azimuth and pitch angles; Step 6: Using the 360-degree heavy orbit circular track spotting VideoSAR deception jamming modulation coefficient video library and VideoSAR heavy orbit targeted deception strategy, generate and modulate the 360-degree heavy orbit circular track ring VideoSAR deception signal to obtain the azimuth-elevation joint deception jamming signal relayed on track by track. Step 7: Forward the azimuth-elevation joint deception jamming signal track by track to jam the enemy's heavy orbit circular track ring VideoSAR system track by track, thereby achieving the deception effect.

2. The 360-degree heavy-track circular track ring-band video synthetic aperture radar jamming method according to claim 1, characterized in that, The interception of the enemy's 360-degree heavy orbit circular track VideoSAR radar signal in the first single track, as described in step 1, includes parameters other than the heavy orbit height difference and elevation angle. These other parameters include signal waveform type, carrier frequency, frequency modulation slope, pulse repetition frequency, and average velocity.

3. The 360-degree heavy-track circular band video synthetic aperture radar jamming method according to claim 1, characterized in that, The enemy's 360-degree heavy orbit circular track videoSAR mentioned in step 1 is mounted on the enemy's spacecraft, and the radar operates in a 360-degree heavy orbit circular track imaging mode at different altitude dimensions.

4. The 360-degree heavy-track circular band video synthetic aperture radar jamming method according to claim 1, characterized in that, Step 2 involves analyzing the enemy's first single-track VideoSAR radar signal to obtain the enemy's single-track VideoSAR signal parameters and platform motion parameters, as detailed below: against enemy single-track VideoSAR signal data Analysis was conducted using the first monorail signal. The signal parameters and platform motion parameters corresponding to each frame are generated respectively to guide the jammer to initially form the jamming parameters; in, These are distance time and location time, respectively. These represent the orientation and distance of any point in the scene. Indicates the first frame, , Indicates the total number of frames. is a positive integer, representing the total number of times the radar observes the double orbit at different altitudes.

5. The 360-degree heavy-track circular track ring-band video synthetic aperture radar jamming method according to claim 4, characterized in that, Step 3, which involves using the enemy's single-track VideoSAR signal parameters and platform motion parameters to guide multi-track analysis and obtain reconnaissance parameters for different tracks, is detailed below: Based on the characteristics of the 360-degree heavy-track circular band VideoSAR imaging mode, other parameters besides the heavy-track height difference and pitch angle are obtained by using single-track signal parameters and platform motion parameters. For the relevant parameters of multiple heavy orbit imaging flights, it is necessary to detect and update the altitude difference and pitch angle; the other parameters do not need to be detected and analyzed repeatedly.

6. The 360-degree heavy-track circular track ring-band video synthetic aperture radar jamming method according to claim 5, characterized in that, Step 4 involves using our own 360-degree double-track circular trajectory spotting VideoSAR spoofing template to solve for false point coefficients, and controlling the size and orientation of the video template according to the target scene requirements to obtain a 360-degree double-track circular trajectory spotting VideoSAR spoofing interference modulation coefficient video library, as detailed below: Step 4.1, Set the ground to have If the jammer is positioned at different locations within a large scene to jam enemy systems, then the template composed of backscattering coefficients is obtained through 360-degree heavy-orbit circular trajectory focused-beam VideoSAR mode imaging. for: ； in, and These correspond to the azimuth and range positions of the interference template, respectively. These represent the positions corresponding to the orientation of the interfering template pixels. These represent the distances to the corresponding positions of the interfering template pixels. and The images obtained after imaging are respectively the first The number of pixels in the azimuth and range directions of the frame template. For the first The azimuth angle of the frame. For the first The top-down view of the trajectory This represents the corresponding scattering coefficient value; Step 4.2: Based on the requirements of the target scene, generate video templates using signal processing methods such as interpolation resampling or frequency domain zero-padding. Size control: ； in, The first image obtained after imaging Image domain data of the frame template; For the first after size control Image domain data of the frame template, and These are the first ones after size control. The number of pixels in the azimuth and range directions of the frame template; Step 4.3: Create video templates based on the requirements of the target scenario. Angle control: ； in, This refers to the rotation angle of the video template; Step 4.4, Video Template After size and angle control, the point is made Change position to new position The video template has changed .

7. The 360-degree heavy-track circular band video synthetic aperture radar jamming method according to claim 6, characterized in that, Step 6 describes the use of a 360-degree heavy-orbit circular track spotting VideoSAR deception jamming modulation coefficient video library and a targeted VideoSAR heavy-orbit deception strategy to generate and modulate a 360-degree heavy-orbit circular track ring-band VideoSAR deception signal, resulting in a track-by-track forwarding azimuth-elevation joint deception jamming signal. The joint deception jamming signal includes the following four types: (1) Using a 360-degree double-track circular trajectory spotting VideoSAR deception jamming modulation coefficient video library and VideoSAR double-track targeted deception strategy, and based on the double-track circular trajectory spotting mode, utilizing the true azimuth angle and a true overhead perspective The generated interference signals of the heavy rail circular track at the same azimuth and elevation angles are as follows: ； in, Indicates to proceed and Signal modulation operation; (2) Using a 360-degree double-track circular trajectory spotting VideoSAR deception jamming modulation coefficient video library and VideoSAR double-track targeted deception strategy, and based on the double-track circular trajectory spotting mode, using false azimuth angles and a true overhead perspective The generated interference signals of the heavy rail circular track loop at different azimuth angles and the same elevation angle are as follows: ； (3) Using a 360-degree double-track circular trajectory spotting VideoSAR deception jamming modulation coefficient video library and VideoSAR double-track targeted deception strategy, and based on the double-track circular trajectory spotting mode, utilizing the true azimuth angle and fake top-down perspective The generated interference signals of the heavy rail circular track at the same azimuth angle and different elevation angles are as follows: ； (4) Using a 360-degree double orbit circular trajectory spotting VideoSAR deception jamming modulation coefficient video library and VideoSAR double orbit targeted deception strategy, and based on the double orbit circular trajectory spotting mode, using false azimuth angles and fake top-down perspective The generated interference signals of the heavy rail circular track loop at different azimuth and elevation angles are as follows: 。 8. The 360-degree heavy-track circular band video synthetic aperture radar jamming method according to claim 7, characterized in that, Step 7 describes forwarding the azimuth-elevation joint deception jamming signal track by track to jam the enemy's heavy orbit circular track ring VideoSAR system track by track, achieving a deception effect, as detailed below: The deception jamming signals of four types of VideoSAR false scenes are forwarded, so that the video deception jamming and the real scene echo signal are simultaneously received by the enemy VideoSAR system, thus achieving the final effect of deception jamming imaging of multiple different orbits and multiple orbits circular track rings of VideoSAR. The forwarding of four types of jamming signals and the selection between different trajectories can generate a variety of combinations to carry out strategic jamming of azimuth-elevation joint deception, so as to disrupt the enemy radar's identification of the target; To counter fast re-orbit interference, the interference signal is pre-modulated before the next re-orbit imaging, and only the elevation difference and pitch angle are updated and modulated. Other parameters do not need to be re-detected and modulated.

9. A 360-degree heavy-track circular track ring-band video synthetic aperture radar jamming system, characterized in that, This system is used to implement the 360-degree double-track circular band video synthetic aperture radar jamming method according to any one of claims 1 to 8. The system includes a radar signal interception module, a single-track analysis module, a multi-track analysis module, a modulation coefficient video library determination module, a deception strategy generation module, a deception jamming signal generation module, and a jamming module, wherein: The radar signal interception module is used to intercept the radar signal of the enemy's 360-degree heavy orbit circular track ring VideoSAR in the first single track. The single-track analysis module is used to analyze the enemy's first single-track VideoSAR radar signal to obtain the enemy's single-track VideoSAR signal parameters and platform motion parameters. The multi-track analysis module guides multi-track analysis based on the enemy's single-track VideoSAR signal parameters and platform motion parameters to obtain reconnaissance parameters for different tracks; The modulation coefficient video library determination module uses the self-made 360-degree heavy orbit circular track spotting VideoSAR deception template to solve for false point coefficients, and controls the size and orientation of the video template according to the target scene requirements to obtain the 360-degree heavy orbit circular track spotting VideoSAR deception interference modulation coefficient video library. The deception strategy generation module is used to generate a fast multi-angle interference strategy for repeated orbits based on the reconnaissance parameters of different orbits, and obtain a VideoSAR repeated orbit targeted deception strategy. The deception jamming signal generation module uses a 360-degree heavy orbit circular track spotting VideoSAR deception jamming modulation coefficient video library and VideoSAR heavy orbit targeted deception strategy to generate and modulate 360-degree heavy orbit circular track ring VideoSAR deception signal, and obtains azimuth-elevation joint deception jamming signal relayed on track by track. The jamming module forwards azimuth-elevation combined deception jamming signals orbit by orbit, jamming the enemy's heavy orbit circular track VideoSAR system orbit by orbit to achieve the deception effect.

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