High-fidelity deception jamming fast generation method and device compatible with large-angle SAR

Abstract

The application discloses a high-fidelity deception jamming fast generation method and device compatible with large squint SAR, and belongs to the technical field of imaging radar electronic countermeasure. The method comprises the following steps: in the initialization stage, based on the position relationship among the SAR, the jammer and the false target, a phase modulation term is calculated in combination with the squint angle, multiplied with a jamming template, and then subjected to two-dimensional Fourier transform to obtain a space frequency domain representation; in the real-time processing stage, the intercepted radar signal is down-converted and transformed into the frequency domain, distance-azimuth two-dimensional resampling is performed on the space frequency domain data of the jamming template to obtain a system response function, the system response function is multiplied with the radar frequency domain signal and then inversely transformed into the time domain to generate a repeater jamming signal. Through high-precision distance coupling modeling and frequency domain fast interpolation, the application solves the problems of phase distortion and large calculation amount under large squint, and realizes high-fidelity and low-delay deception jamming.

Description

Technical Field

[0001] This invention belongs to the field of imaging radar electronic countermeasures technology, specifically relating to a method and apparatus for rapidly generating high-fidelity deception jamming compatible with large squint SAR. Background Technology

[0002] Synthetic Aperture Radar (SAR) plays an irreplaceable role in military reconnaissance, geographic mapping, and other fields due to its advantages of all-weather, all-day, long-range, and high-resolution observation capabilities. Depending on the angle between the beam pointing and the platform's heading during imaging (i.e., the angle of view), SAR operating modes can be divided into frontal side-looking, small-angle-looking, and large-angle-looking modes. Among these, the large-angle-looking mode causes the radar beam to deviate significantly from the side of the platform, enabling forward and delayed imaging of areas in front or behind, greatly expanding the flexibility of observation and tactical application scenarios. It has become a key technology for SAR systems on high-speed mobile platforms such as UAVs and missiles.

[0003] As SAR systems continue to evolve towards larger squint and higher resolution, corresponding electronic countermeasures technologies, especially deception jamming techniques targeting SAR, are facing increasingly severe challenges. Deception jamming aims to induce SAR to produce incorrect imaging results by generating false signals that are highly similar to the echoes of real targets, thereby concealing the real target and carrying out tactical deception. However, under the geometry of large squint imaging, the relative motion between the radar and the target is complex, resulting in severe spatial variation characteristics and strong range-azimuth coupling effects in the range history of the echo signal. Traditional jamming algorithms based on frontal or small squint models will produce significant phase errors and geometric distortions, making it difficult to generate highly realistic false scene images.

[0004] In existing technologies, most methods for generating deceptive jamming signals are based on a modulation-forwarding mechanism. One type of method (such as Chinese patent application publications CN112285658A and CN118884370B) typically uses a quadratic phase expansion to approximate the range difference model, neglecting the spatial variability of the range history with azimuth position. This leads to severe phase mismatch and image defocusing under large slant-view conditions. Another type of improved method (such as Chinese patent application publication CN117647779A) attempts to add higher-order terms to the range model or use imaging algorithms for inverse solving. However, it still does not fully retain key coupling terms in the equivalent slant-range modeling, and the calculation process is complex, making real-time performance difficult to guarantee. Furthermore, when generating the jamming modulation signal (system response function), existing methods mostly rely on point-by-point delay calculations or two-dimensional temporal convolutions for each scattering point in the jamming template. The computational load increases dramatically with the template size, failing to meet the stringent requirements of modern electronic warfare for high fidelity, fast response, and low power consumption.

[0005] Therefore, how to accurately and efficiently construct an interference signal model containing complete range-azimuth coupling relationship under complex geometry with large squint, and how to achieve rapid generation of system response function, is a key technical problem that urgently needs to be solved in the field of SAR electronic countermeasures. Summary of the Invention

[0006] To address the aforementioned technical problems, this invention provides a method and apparatus for rapidly generating high-fidelity deception jamming compatible with large-angle SAR. The method mainly consists of two parts: initialization and real-time modulation signal processing. The initialization part includes jamming template preprocessing and spatial domain transformation. The preprocessing process includes: 1) determining the positional relationship between the synthetic aperture radar, the jammer, and the false scene through electronic reconnaissance; 2) generating a modulation phase based on the target distribution of the jamming template and the radar imaging angle; 3) performing preprocessing of the jamming template by multiplying the jamming template with the modulation phase, and then obtaining the spatial frequency domain data of the jamming template by performing a two-dimensional Fourier transform on the preprocessed template, thus completing the jammer initialization. The real-time modulation signal processing process is as follows: first, the jammer intercepts the radar signal, down-converts it, and then performs a Fourier transform to obtain the frequency domain signal; then, the spatial frequency domain data of the jamming template is interpolated in the range and azimuth dimensions to obtain the real-time system response function; finally, the frequency domain representation of the intercepted signal is multiplied by the system response function and transformed to the time domain to obtain the real-time forwarding signal modulated by the entire jamming template.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] A method for rapidly generating high-fidelity deception jamming compatible with large-slant-look SAR, the method comprising:

[0009] Step 1: Determine the positional relationship between the synthetic aperture radar, the jammer, and the false target;

[0010] Step 2: Calculate the phase modulation term based on the positional relationship, interference template, and SAR imaging oblique angle parameters;

[0011] Step 3: By performing a two-dimensional spatial frequency domain transformation on the product of the interference template and the phase modulation term, the two-dimensional spatial frequency domain representation of the interference template is obtained, and the jammer initialization is completed.

[0012] Step 4: The jammer intercepts the radar signal, down-converts it, and transforms it to the frequency domain to obtain the frequency domain representation of the intercepted radar signal.

[0013] Step 5: Perform range-azimuth two-dimensional resampling on the two-dimensional spatial frequency domain representation of the interference template to obtain the system response function;

[0014] Step 6: Multiply the frequency domain representation of the intercepted radar signal by the system response function, and obtain the forwarding jamming signal after inverse Fourier transform.

[0015] On the other hand, the present invention provides a high-fidelity deception jamming rapid generation device compatible with large squint SAR, comprising:

[0016] The positional relationship determination module is used to determine the positional relationship between the synthetic aperture radar, the jammer, and the false target;

[0017] The modulation term determination module is used to calculate the phase modulation term based on the positional relationship, interference template, and SAR imaging oblique angle parameters.

[0018] The jammer initialization module is used to obtain the two-dimensional spatial frequency domain representation of the jammer template by performing a two-dimensional spatial frequency domain transformation on the product of the jammer template and the phase modulation term, thereby completing the jammer initialization.

[0019] The radar signal acquisition module is used by the jammer to intercept radar signals, down-convert them to the frequency domain, and obtain the frequency domain representation of the intercepted radar signals.

[0020] The response function acquisition module is used to perform range-azimuth two-dimensional resampling on the two-dimensional spatial frequency domain representation of the interference template to obtain the system response function;

[0021] The jamming signal generation module is used to multiply the frequency domain representation of the intercepted radar signal with the system response function, and obtain the forwarding jamming signal after inverse Fourier transform.

[0022] Thirdly, the present invention provides an electronic device, comprising: one or more processors; and 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 aforementioned method for rapidly generating high-fidelity deception interference compatible with large-angle-view SAR.

[0023] Fourthly, the present invention provides a computer-readable storage medium having executable instructions stored thereon, which, when executed by a processor, enable the processor to implement the aforementioned method for rapidly generating high-fidelity deception interference compatible with large-angle-view SAR.

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

[0025] High imaging fidelity: By performing high-precision modeling of the equivalent range under the geometry of large-angle SAR imaging, the coupling relationship between range and azimuth is fully preserved, thus effectively overcoming the geometric distortion and defocusing problems caused by phase approximation in traditional methods. The generated deception jamming signal can faithfully restore the contour, shape, and detailed features of false targets, significantly improving the realism of the jamming and the success rate of deception.

[0026] High processing speed and strong real-time performance: This innovative approach employs a "pre-computation + real-time interpolation" generation architecture. During initialization, a phase modulation term is introduced, combined with a two-dimensional Fourier transform, to pre-convert the interference template into spatial frequency domain data. In real-time processing, the system response function can be efficiently constructed simply by performing rapid range-azimuth two-dimensional resampling interpolation in the frequency domain based on the current parameters, significantly reducing computational complexity. This method eliminates the reliance on computational resources inherent in traditional point-by-point modulation or time-domain iteration, meeting the real-time processing requirements of modern electronic warfare for low latency and high throughput.

[0027] Highly adaptable and widely applicable: The proposed distance modeling and rapid generation method is universally applicable, adaptively covering various imaging modes from frontal and side views to large and small oblique views, allowing for flexible system design. This method is particularly suitable for airborne and missile-borne mobile jamming platforms with limitations on equipment size, weight, and power consumption, possessing significant military application value and promising prospects for engineering promotion. Attached Figure Description

[0028] Figure 1 A geometric model of SAR interference under a large oblique angle;

[0029] Figure 2 This is a block diagram illustrating the principle of the high-fidelity deception interference rapid generation method compatible with large-angle SAR of the present invention.

[0030] Figure 3 The flowchart of the high-fidelity deception interference rapid generation method compatible with large squint SAR of the present invention is shown below;

[0031] Figure 4 This is a schematic diagram of the interference template of the present invention;

[0032] Figure 5 The diagram shows the deception interference effect of the method of the present invention, where (a) is the 0° oblique angle condition and (b) is the 50° oblique angle condition.

[0033] Figure 6 The diagram shows a comparison of the deception and interference effects of the method of the present invention. (a) is the imaging result under a 50° oblique angle, (b) is the imaging result of the first prior art, (c) is the imaging result of the second prior art, (d) is the imaging result of the third prior art, and (e) is the imaging result of the present invention. Detailed Implementation

[0034] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0035] like Figure 1The diagram shows the SAR interference geometry model, where the angle of view is the angle between the radar antenna beam centerline and the plane perpendicular to the platform's motion direction (zero Doppler plane). In a straight-on view, the angle of view is 0°, and the beam is perpendicular to the platform's motion direction; in the oblique-view mode, the beam deviates forward (forward oblique view) or backward (backward oblique view).

[0036] like Figure 2 The diagram shows the system principle block diagram applicable to this invention. First, the reconnaissance equipment detects and measures the SAR system parameters (SAR platform speed, carrier frequency, pulse width, chirp rate, repetition rate, etc.). Based on some parameters, the jamming deception image is preprocessed, and then a range-azimuth two-dimensional Fourier transform is performed to generate two-dimensional spatial frequency domain data of the jamming image. At the start of jamming, the jammer intercepts the SAR signal, amplifies the intercepted radar radio frequency (RF) signal, down-converts it to the baseband frequency, performs analog-to-digital (A / D) conversion, and then performs a Fast Fourier Transform (FFT) to the baseband frequency domain. Then, resampling technology is used to interpolate the two-dimensional spatial frequency domain data of the jamming image to obtain the system response function. Finally, the baseband frequency domain data is multiplied by the system response function, and an inverse FFT (IFFT) is performed to obtain the baseband signal of the jamming signal. The jamming signal is then retransmitted to the SAR through digital-to-analog (D / A) conversion, up-conversion, and gain control operations. By repeating these steps for each intercepted pulse, the SAR can generate false images to deceive the jammer.

[0037] The following is based on Figure 3 The present invention provides a method for rapidly generating high-fidelity deception jamming compatible with large-slant-look SAR, comprising the following steps:

[0038] Step 1: Determine the positional relationship between the synthetic aperture radar, the jammer, and the false target;

[0039] Step 2: Calculate the phase modulation term based on the positional relationship, interference template, and SAR imaging oblique angle parameters;

[0040] Step 3: By performing a two-dimensional spatial frequency domain transformation on the product of the interference template and the phase modulation term, the two-dimensional spatial frequency domain representation of the interference template is obtained, and the jammer initialization is completed.

[0041] Step 4: The jammer intercepts the radar signal, down-converts it, and transforms it to the frequency domain to obtain the frequency domain representation of the intercepted radar signal.

[0042] Step 5: Perform range-azimuth two-dimensional resampling on the two-dimensional spatial frequency domain representation of the interference template to obtain the system response function;

[0043] Step 6: Multiply the frequency domain representation of the intercepted radar signal by the system response function, and obtain the forwarding jamming signal after inverse Fourier transform.

[0044] Specifically, step 1 includes:

[0045] Define the position coordinates of the jammer and the false target as follows: and At this point, the distance difference between the radar and the false target / jammer is... for:

[0046] ,

[0047] in, The distance from the radar to the jammer, The distance at which the radar reaches the false target. The angle of view in SAR imaging is represented by the angle of view, where This indicates the azimuth difference between the center of the radar's trajectory and the position of the jammer. This represents the shortest slant distance between the radar and the jammer. For radar movement speed, Let H be the slow time of radar movement. Then, for the entire jamming image, the system response function H is expressed as:

[0048] ,

[0049] in, Indicates the target distribution in the interfering image. For radar in fast time and frequency domain, For radar carrier frequency, At the speed of light, It is the imaginary unit.

[0050] Distance at which radar reaches false targets Distance from radar to jammer exist After performing a Taylor expansion at point 1 and retaining the quadratic term, the distance difference can be expressed as:

[0051] ,

[0052] This represents the slant distance from the center of the SAR motion trajectory to the fake scene.

[0053] Step 2 specifically includes:

[0054] By measuring the distance difference Perform a Taylor series expansion at the slow-time zero point, retaining down to the quadratic term; this distance difference... This can be further expressed as:

[0055] ,

[0056] because The term is only related to the location of the interference template and is independent of the slow time of SAR motion. It can be calculated in the preprocessing stage to form the phase modulation term. :

[0057] ,

[0058] Step 3 specifically includes:

[0059] The system response function H can be rewritten as Represented as:

[0060] ,

[0061] The product of the interference template and the phase modulation term can be expressed as: :

[0062] ,

[0063] A two-dimensional Fourier transform is performed on it to obtain a two-dimensional spatial frequency domain representation of the interference template:

[0064] ,

[0065] This completes the initialization of the entire interference process. Represents the azimuth coordinates in the two-dimensional spatial frequency domain. Represents the distance dimension coordinates in the two-dimensional spatial frequency domain. This represents a two-dimensional Fourier transform.

[0066] Step 4 specifically includes:

[0067] The radar signal intercepted at the jammer is directly returned to the radar receiver, and after down-conversion, it can be represented as a baseband signal.

[0068] ,

[0069] in, Represents the window function. , Indicates time, , Indicates the pulse width. The chirp rate is represented by a Fourier transform, which is applied to the range frequency domain to obtain a range frequency domain representation. This range frequency domain representation includes the modulation information and range-direction frequency distribution of the radar signal, and can be expressed as:

[0070] ,

[0071] Step 5 specifically includes:

[0072] The system response function H is expressed as the spatial frequency domain representation of the phase value of the interference template at a specific location. It can be represented as:

[0073] ,

[0074] Here, This represents the impact function. Because... , ,and and Since it is irrelevant, it can be omitted here, resulting in the system response function after omission. It can be represented as:

[0075] ,

[0076] because , , The pulse repetition period of the SAR is represented by the discretized system response function. It can be represented as:

[0077] ,

[0078] It can now be seen that the system response function can be expressed as the phase value at the location of the two-dimensional frequency domain response in the interference image. The locations corresponding to distance and azimuth are as follows:

[0079] ,

[0080] It can be seen that the phase values ​​of the distance and azimuth dimensions change with slow time.

[0081] ,

[0082] in, Indicates rounding down. and This indicates the spatial frequency domain azimuth and range position index of the phase value to be acquired. , Let M represent the spatial frequency interval in the image spatial domain, and N represent the number of points in the orientation dimension of the spatial frequency domain, and N represent the number of points in the distance dimension of the spatial frequency domain. This indicates the sampling frequency of the spatial orientation dimension of the deception template. The sampling frequency represents the spatial orientation dimension of the deception template. In the two-dimensional spatial frequency domain representation of the interference template, bilinear interpolation is performed based on the distance frequency value and the orientation frequency value to obtain the system response function at the current moment. It can be represented as:

[0083] ,

[0084] It is the sinc interpolation kernel function, where L represents the number of interpolation points. and This represents the two-dimensional spatial frequency domain azimuth and range position index of the template. At this point, the rapid construction of the system response function is complete.

[0085] Step 6 specifically includes:

[0086] Finally, the radar frequency domain signal at the jammer and the system response function are compared. Multiplying them together, we get:

[0087] ,

[0088] At this point, the modulation of the entire image is complete, and the echo signal at the location of the false target has been perfectly recovered. After inverse Fourier transform, the time-domain baseband signal can be recovered.

[0089] ,

[0090] The time-domain baseband interference signal is transmitted after undergoing digital-to-analog conversion, up-conversion, and power amplification.

[0091] Therefore, by constructing a phase term for the jamming template and generating two-dimensional spatial-frequency domain data of the jamming template, and then performing range-azimuth interpolation on the two-dimensional spatial-frequency domain data of the jamming template based on the spatial-frequency domain positions at different slow time points, the system response function of the entire image modulation can be quickly obtained. Multiplying this with the frequency domain of the radar intercepted signal yields the frequency domain representation of the jammer's relay signal. Finally, the time domain signal of the jamming relay signal is recovered through inverse Fourier transform. The entire process employs a highly realistic range representation method, enabling distortion-free recovery of the jammed image; it is also fast, overcoming the limitation of conventional point-by-point modulation computational complexity varying with the size of the jammed image, making it suitable for applications with high requirements for real-time radar processing and constraints on the size and weight of the jammer.

[0092] The performance of the proposed method will be verified through simulation experiments to prove the correctness of the theoretical analysis. The specific simulation experimental parameters are shown in Table 1. Figure 4 This is a interference template. Figure 5 The images show the deception effect on point targets, where (a) shows the deception effect and a magnified view at a 0° oblique angle; and (b) shows the deception effect and a magnified view at a 50° oblique angle. Simulations of point targets clearly demonstrate the good imaging quality of this algorithm.

[0093] Table 1

[0094]

[0095] Figure 6 For the comparison of the deception interference effects of different algorithms, (a) is the imaging result under a 50° oblique viewing angle; (b) is the imaging result of the first prior art (Chinese Patent Publication No. CN112285658A); (c) is the imaging result of the second prior art (Chinese Patent Publication No. CN117647779A); (d) is the imaging result of the third prior art (Chinese Patent Publication No. CN118884370B); (e) is the imaging result of the present invention. It can be clearly seen that the algorithm can maintain the greatest consistency with the real imaging result in the current shape of the target, thereby maintaining a high degree of realism in the imaging quality and shape of the deceiving false target, and achieving high-fidelity deception.

[0096] On the other hand, the present invention provides a high-fidelity deception jamming rapid generation device compatible with large-angle-view SAR, the various modules of which can implement the various steps of the aforementioned method, specifically including:

[0097] The positional relationship determination module is used to determine the positional relationship between the synthetic aperture radar, the jammer, and the false target;

[0098] The modulation term determination module is used to calculate the phase modulation term based on the positional relationship, interference template, and SAR imaging oblique angle parameters.

[0099] The jammer initialization module is used to obtain the two-dimensional spatial frequency domain representation of the jammer template by performing a two-dimensional spatial frequency domain transformation on the product of the jammer template and the phase modulation term, thereby completing the jammer initialization.

[0100] The radar signal acquisition module is used by the jammer to intercept radar signals, down-convert them to the frequency domain, and obtain the frequency domain representation of the intercepted radar signals.

[0101] The response function acquisition module is used to perform range-azimuth two-dimensional resampling on the two-dimensional spatial frequency domain representation of the interference template to obtain the system response function;

[0102] The jamming signal generation module is used to multiply the frequency domain representation of the intercepted radar signal with the system response function, and obtain the forwarding jamming signal after inverse Fourier transform.

[0103] Thirdly, the present invention provides an electronic device, comprising: one or more processors; and 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 aforementioned method for rapidly generating high-fidelity deception interference compatible with large-angle-view SAR.

[0104] Fourthly, the present invention provides a computer-readable storage medium having executable instructions stored thereon, which, when executed by a processor, enable the processor to implement the aforementioned method for rapidly generating high-fidelity deception interference compatible with large-angle-view SAR.

[0105] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for rapidly generating high-fidelity deception interference compatible with large-slant-look SAR, characterized in that, The method includes: Step 1: Determine the positional relationship between the synthetic aperture radar, the jammer, and the false target; Step 2: Calculate the phase modulation term based on the positional relationship, interference template, and SAR imaging oblique angle parameters; Step 3: By performing a two-dimensional spatial frequency domain transformation on the product of the interference template and the phase modulation term, the two-dimensional spatial frequency domain representation of the interference template is obtained, and the jammer initialization is completed. Step 4: The jammer intercepts the radar signal, down-converts it, and transforms it to the frequency domain to obtain the frequency domain representation of the intercepted radar signal. Step 5: Perform range-azimuth two-dimensional resampling on the two-dimensional spatial frequency domain representation of the interference template to obtain the system response function; Step 6: Multiply the frequency domain representation of the intercepted radar signal by the system response function, and obtain the forwarding jamming signal after inverse Fourier transform.

2. The method for rapid generation of high-fidelity deception interference compatible with large squint SAR according to claim 1, characterized in that, Step 1 includes: acquiring the carrier frequency, bandwidth, pulse repetition period, platform motion speed, and initial slant range parameters of the synthetic aperture radar through electronic reconnaissance equipment; calculating the slant range change history of the SAR relative to the jammer and false targets at different slow time points based on the SAR orbit model and jammer position; and establishing a geometric relationship model that includes azimuth-dimensional spatial variation characteristics based on the SAR slant angle and the planar coordinates of the false targets.

3. The method for rapid generation of high-fidelity deception interference compatible with large squint SAR according to claim 1, characterized in that, Step 2 includes: calculating the distance difference between the radar and the jammer and between the radar and the false target based on the SAR platform's motion speed, carrier frequency, and the position coordinates of the jammer and the false target; performing a Taylor series expansion on the distance difference at the slow time zero point, retaining it down to the second term; and extracting the phase term from the expansion that is related to the spatial position of the jamming template and is independent of the slow time to form the phase modulation term.

4. The method for rapid generation of high-fidelity deception interference compatible with large squint SAR according to claim 1, characterized in that, Step 3 includes: performing a two-dimensional Fourier transform on the product to convert the preprocessed interference template from the spatial domain to the spatial frequency domain, forming a two-dimensional frequency domain dataset containing the scattering characteristics of the interference template and range-azimuth coupling phase information.

5. The method for rapid generation of high-fidelity deception interference compatible with large squint SAR according to claim 1, characterized in that, Step 4 includes: performing down-conversion processing on the intercepted radar signal to obtain a baseband signal; performing a fast Fourier transform on the baseband signal to obtain a range-frequency domain representation; the range-frequency domain representation includes the modulation information and range-direction frequency distribution of the radar signal.

6. The method for rapid generation of high-fidelity deception interference compatible with large squint SAR according to claim 1, characterized in that, The range-azimuth two-dimensional resampling in step 5 includes: calculating the corresponding range frequency value and azimuth frequency value based on the Doppler parameters at the current slow time; and performing a two-dimensional interpolation operation based on the range frequency value and azimuth frequency value in the two-dimensional spatial frequency domain representation of the interference template to obtain the system response function at the current time.

7. The method for rapid generation of high-fidelity deception interference compatible with large squint SAR according to claim 1, characterized in that, Step 6 specifically includes: multiplying the frequency domain representation of the intercepted radar signal with the system response function at the current moment in the frequency domain; performing an inverse Fourier transform on the multiplication result to obtain the time-domain baseband interference signal; and transmitting the time-domain baseband interference signal after performing digital-to-analog conversion, up-conversion, and power amplification.

8. A high-fidelity deception jamming rapid generation device compatible with large-slant-look SAR, characterized in that, include: The positional relationship determination module is used to determine the positional relationship between the synthetic aperture radar, the jammer, and the false target; The modulation term determination module is used to calculate the phase modulation term based on the positional relationship, interference template, and SAR imaging oblique angle parameters. The jammer initialization module is used to obtain the two-dimensional spatial frequency domain representation of the jammer template by performing a two-dimensional spatial frequency domain transformation on the product of the jammer template and the phase modulation term, thereby completing the jammer initialization. The radar signal acquisition module is used by the jammer to intercept radar signals, down-convert them to the frequency domain, and obtain the frequency domain representation of the intercepted radar signals. The response function acquisition module is used to perform range-azimuth two-dimensional resampling on the two-dimensional spatial frequency domain representation of the interference template to obtain the system response function; The jamming signal generation module is used to multiply the frequency domain representation of the intercepted radar signal with the system response function, and obtain the forwarding jamming signal after inverse Fourier transform.

9. An electronic device, characterized in that, include: One or more processors; Memory, used to store one or more programs; When one or more programs are executed by the one or more processors, the one or more processors implement the high-fidelity deception jamming rapid generation method compatible with large squint SAR as described in any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, It stores executable instructions that, when executed by a processor, enable the processor to implement the high-fidelity deception jamming rapid generation method compatible with large-slant-look SAR as described in any one of claims 1-7.

Images