ISAR two-dimensional false target generation method, device, computer equipment and medium

Abstract

This application relates to a two-dimensional ISAR false target generation method, apparatus, computer equipment, and medium. Based on periodic two-phase modulation technology, a two-dimensional false target range template is generated based on the parameters of an intercepted radar signal transmitted by an inverse synthetic aperture radar and preset false target-related required information. The radar signal is subjected to single-bit sampling and quantization to obtain a processed radar signal. The processed radar signal is convolved with the two-dimensional false target range template to obtain a false target signal acting on the radar signal. This method can effectively reduce the storage space and computing resource consumption of the onboard entity while improving the interference capability of the interference signal.

Description

Technical Field

[0001] The present application relates to the field of radar imaging technology, and in particular to a method, device, computer equipment and medium for generating an ISAR two-dimensional false target. Background Art

[0002] Inverse Synthetic Aperture Radar (ISAR) is capable of high-resolution, two-dimensional imaging of aerial targets around the clock and in all weather conditions. Jamming ISAR has become a hot topic. Currently, ISAR jamming is categorized into two types: passive and active. With the development of Digital Radio Frequency Memory (DRFM) technology, active deceptive jamming methods for ISAR have become much simpler to implement.

[0003] ISAR active deception jamming uses a jammer to generate and transmit false target echo signals to the enemy radar, causing the enemy radar to image and process the false target echo signals, thereby creating one or more false targets on the radar interface, thereby confusing the enemy radar and causing it to misjudge. During the false target generation process, the jammer typically modulates the range and amplitude of the false target. This modulation can be achieved through convolution operations. The jamming signal is generated by convolving the intercepted radar transmit signal with a pre-designed range profile template.

[0004] However, in this process, if high-precision multi-bit sampling quantization is used for the radar transmission signal, a large amount of storage and computing resources will be consumed, which is not conducive to engineering implementation. Summary of the Invention

[0005] Based on this, it is necessary to provide an ISAR two-dimensional false target generation method, device, computer equipment and medium that can reduce storage space and computing resource consumption to address the above technical problems.

[0006] A method for generating a two-dimensional false target for ISAR, comprising:

[0007] Acquiring an intercepted radar signal, where the radar signal is a signal transmitted by an inverse synthetic aperture radar;

[0008] Based on the periodic two-phase phase modulation technology, a two-dimensional false target distance template is generated according to the parameters of the radar signal and the preset false target-related requirement information;

[0009] performing single-bit sampling and quantization processing on the radar signal to obtain a processed radar signal;

[0010] The processed radar signal is convolved with a two-dimensional false target range template to obtain a false target signal acting on the radar signal.

[0011] In one embodiment, the preset requirement information related to the false target includes: scattering characteristics and distance characteristics of a single false target.

[0012] In one embodiment, the periodic two-phase phase modulation technology is used to generate a two-dimensional false target range template according to the parameters of the radar signal and preset false target-related requirement information, including:

[0013] Constructing a false target echo signal of a single false target according to the parameters of the radar signal and preset requirement information related to the false target;

[0014] Performing periodic two-phase modulation on the false target echo signal in a fast time domain and a slow time domain to obtain a modulated signal having multiple false targets;

[0015] performing range pulse compression, azimuth Fourier transform, and range calibration on the modulated signal to obtain an ISAR image;

[0016] After amplitude modulation is performed on the ISAR image, an inverse Fourier transform is performed on the amplitude modulated ISAR image in azimuth to obtain the two-dimensional false target range template.

[0017] In one embodiment, when performing amplitude analysis on the ISAR image:

[0018] In the ISAR image, for the area corresponding to each false target, different coefficient matrices are used to perform amplitude enhancement.

[0019] In one embodiment, the false target echo signal is expressed as:

[0020]

[0021] In the above formula, f c represents the carrier frequency, k represents the modulation frequency, T p represents the pulse width, B represents the signal bandwidth, t r and t m Represents the time index of fast time dimension and slow time dimension respectively, t m =mT PRI , the total time t = t r +t m , T PRI represents the pulse repetition interval, σ i represents the intensity of the i-th scattering point of a single false target, K represents the number of scattering points of a single false target, τ irepresents the time delay of the i-th scattering point.

[0022] In one embodiment, the modulation signal is expressed as:

[0023]

[0024] In the above formula, p(t r ) and p(t m ) are periodic two-phase modulation sequences in the fast time domain and slow time domain, respectively, and satisfy the common form:

[0025]

[0026] In the above formula, τ represents the pulse width of the sampled square wave signal, T m Indicates the modulation period.

[0027] In one embodiment, single-bit sampling and quantization processing is performed on the radar signal, which is expressed as:

[0028] s′(t)=sign(real(s(t)))+j·sign(imag(s(t)))

[0029] In the above formula, real[·] and imag[·] represent the real part and imaginary part operations respectively, sign[·] represents the sign bit operation, and s(t) represents the radar signal.

[0030] The present application provides an ISAR two-dimensional false target generation device, the device comprising:

[0031] A radar signal acquisition module is used to acquire an intercepted radar signal, where the radar signal is a signal transmitted by an inverse synthetic aperture radar;

[0032] A two-dimensional false target distance template generation module is used to generate a two-dimensional false target distance template based on periodic two-phase phase modulation technology according to the parameters of the radar signal and preset false target-related requirement information;

[0033] a radar signal processing module, configured to perform single-bit sampling and quantization processing on the radar signal to obtain a processed radar signal;

[0034] The false target signal generating module is used to perform a convolution operation on the processed radar signal and a two-dimensional false target range template to obtain a false target signal acting on the radar signal.

[0035] A computer device includes a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the following steps are implemented:

[0036] Acquiring an intercepted radar signal, where the radar signal is a signal transmitted by an inverse synthetic aperture radar;

[0037] Based on the periodic two-phase phase modulation technology, a two-dimensional false target distance template is generated according to the parameters of the radar signal and the preset false target-related requirement information;

[0038] performing single-bit sampling and quantization processing on the radar signal to obtain a processed radar signal;

[0039] The processed radar signal is convolved with a two-dimensional false target range template to obtain a false target signal acting on the radar signal.

[0040] A computer-readable storage medium stores a computer program, which, when executed by a processor, implements the following steps:

[0041] Acquiring an intercepted radar signal, where the radar signal is a signal transmitted by an inverse synthetic aperture radar;

[0042] Based on the periodic two-phase phase modulation technology, a two-dimensional false target distance template is generated according to the parameters of the radar signal and the preset false target-related requirement information;

[0043] performing single-bit sampling and quantization processing on the radar signal to obtain a processed radar signal;

[0044] The processed radar signal is convolved with a two-dimensional false target range template to obtain a false target signal acting on the radar signal.

[0045] The aforementioned ISAR two-dimensional decoy generation method, apparatus, computer device, and medium utilize periodic binary phase modulation technology to generate a two-dimensional decoy range template based on the parameters of an intercepted radar signal transmitted by an inverse synthetic aperture radar and preset decoy-related required information. The radar signal is then subjected to single-bit sampling and quantization to obtain a processed radar signal. This processed radar signal is then convolved with the two-dimensional decoy range template to generate a decoy signal acting on the radar signal. This method effectively reduces the storage space and computing resource consumption of the onboard entity while improving the jamming capability of the jamming signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 FIG. 1 is an application environment diagram of an ISAR two-dimensional false target generation method in one embodiment;

[0047] Figure 2 Schematic diagram of the overall process of generating a false target signal, i.e., an interference signal, in one embodiment;

[0048] Figure 3A schematic diagram of the aircraft scattering point model used in an experiment;

[0049] Figure 4 A schematic diagram of a two-dimensional interfering ISAR image produced by periodic two-phase modulation in the fast and slow time domains in an experiment;

[0050] Figure 5 A schematic diagram of a two-dimensional interfering ISAR image after amplitude modulation in an experiment;

[0051] Figure 6 Schematic diagram of the interference signal ISAR image generated by the convolution template range image of the single-bit sampling quantized signal in an experiment;

[0052] Figure 7 1. It is a structural block diagram of an ISAR two-dimensional false target generation device in one embodiment;

[0053] Figure 8 FIG. 1 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0054] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0055] In view of the problem in the prior art that when a jammer generates a false target signal according to a radar transmission signal, a large amount of storage and computing resources are consumed, which is not conducive to engineering implementation, in this application, Figure 1 As shown, a method for generating a two-dimensional ISAR false target is provided, which specifically includes the following steps:

[0056] Step S100: Obtain an intercepted radar signal, where the radar signal is a signal transmitted by an inverse synthetic aperture radar.

[0057] Step S110 , based on the periodic two-phase modulation technology, a two-dimensional false target range template is generated according to the parameters of the radar signal and preset false target-related requirement information.

[0058] Step S120 , performing single-bit sampling and quantization processing on the radar signal to obtain a processed radar signal.

[0059] Step S130 : performing a convolution operation on the processed radar signal and the two-dimensional false target range template to obtain a false target signal acting on the radar signal.

[0060] This embodiment provides a two-dimensional false target generation method for ISAR based on single-bit sampling quantization and phase modulation. By performing single-bit sampling quantization on intercepted radar signals, the jammer's storage space and computing resource consumption are significantly reduced. Simultaneously, by performing periodic two-phase modulation on the echo signal of a single false target in the fast and slow time domains, a two-dimensional range profile template for multiple false targets is generated. To address the obvious regularity of the amplitude characteristics of false targets generated by periodic two-phase modulation, the range profile template is artificially modulated to enhance its jamming capability.

[0061] In step S100, the intercepted radar signal is the ISAR signal to be interfered.

[0062] In step S110 , the preset required information related to the false target includes: the scattering characteristics and distance characteristics of a single false target.

[0063] In this embodiment, a two-dimensional false target range template is generated based on radar signal parameters and preset false target-related requirement information based on periodic two-phase phase modulation technology. The method includes: first, constructing a false target echo signal of a single false target based on the radar signal parameters and the preset false target-related requirement information; performing periodic two-phase modulation on the false target echo signal in the fast time domain and the slow time domain to obtain a modulated signal having multiple false targets; performing range pulse compression, azimuth Fourier transform, and range calibration on the modulated signal to obtain an ISAR image; performing amplitude modulation on the ISAR image; and performing an inverse Fourier transform in azimuth on the amplitude-modulated ISAR image to obtain a two-dimensional false target range template.

[0064] Specifically, the false target echo signal s corresponding to the single false target is constructed according to the intercepted radar transmission signal parameters and the scattering characteristics and distance characteristics of the single false target to be generated. r (t r , t m ).

[0065] Assuming that the ISAR transmits a linear frequency modulation signal, the relevant parameters can be further obtained, including the carrier frequency f c , the modulation frequency is k, the pulse width is T p , the signal bandwidth is B, and the pulse repetition interval is T PRI , then the false target echo signal constructed for a single false target is expressed as:

[0066]

[0067] In the above formula, t r and t m Represents the time index of fast time dimension and slow time dimension respectively, t m =mTPRI , the total time t = t r +t m , T PRI Represents the pulse repetition interval. i represents the intensity of the i-th scattering point of a single false target, K represents the number of scattering points of a single false target, τ i represents the time delay of the i-th scattering point. These two parameters represent the preset requirement information related to the false target, the scattering characteristics of a single false target, and the distance characteristics, respectively.

[0068] Furthermore, the false target echo signal s corresponding to a single false target r (t r , t m ) performs periodic two-phase phase modulation in the fast and slow time domains respectively, then a single false target in the false target echo signal can be translated and copied to obtain a modulated signal with multiple false targets.

[0069] In this embodiment, when periodic two-phase modulation is adopted, the distances between the false targets in the range direction and the azimuth direction can be controlled by adjusting relevant parameters, thereby controlling the positions of the false targets.

[0070] Specifically, assuming that p(t r ) and p(t m ) are periodic two-phase modulation sequences in the fast time domain and slow time domain, respectively, and satisfy the common form:

[0071]

[0072] In the above formula, τ represents the pulse width of the sampled square wave signal, T m Indicates the modulation period.

[0073] Specifically, in terms of distance, assume that:

[0074]

[0075] And in the azimuth direction, assuming:

[0076]

[0077] Among them, t r and t m Represent the time index of fast time dimension and slow time dimension respectively, τ r and τ a Respectively represent the pulse width of the square wave signal sampled in the range and azimuth directions, T r and T a Represent the modulation period of the periodic two-phase phase modulation sequence in the range direction and azimuth direction respectively.

[0078] Specifically, the modulated signal is expressed as:

[0079]

[0080] Then in the distance upward, with the initial single false target as the center, the spacing between the false targets is Azimuthally upward, with the initial single false target as the center, the spacing between false targets is Where ω is the target rotation angular velocity.

[0081] Next, the modulated signal s j (t r , t m ) is used to perform pulse compression in the range direction, Fourier transform in the azimuth direction, and range calibration to obtain the ISAR image s(r r , r a ), expressed as:

[0082]

[0083] In the above formula, M is the number of accumulated pulses. m1 and f m2 are the phase modulation frequencies in the range and azimuth directions, ω is the target rotation angular velocity, x i and y i are the starting coordinate positions of the i-th scattering point in the reference coordinate system.

[0084] In this embodiment, since the amplitude of the false target after periodic two-phase phase modulation shows a regularity of decreasing from the center to the ends in the range and azimuth directions, the area corresponding to each false target in the ISAR image is multiplied by a different coefficient matrix to enhance it in order to weaken its regularity and enhance the deceptiveness of the interference. That is, the area corresponding to each false target in the ISAR image is enhanced using a different coefficient matrix, that is, each false target in the ISAR image is multiplied by a different coefficient matrix, so that false targets of different intensities appear in the echo signal imaging after interference. After amplitude modulation, the amplitude modulated ISAR image data S is obtained. amp (r r , r a ).

[0085] Furthermore, for S amp (r r , r a ) performs an inverse Fourier transform in the azimuth direction to obtain a two-dimensional false target distance template s amp (m, n).

[0086] In step S120, the radar signal s(t) is subjected to single-bit sampling and quantization. This process is equivalent to taking the symbol value of the sampled signal as the sampling value, and the process is as follows:

[0087] s′(t)=sign(s(t))

[0088] Since s(t) is real data, it is necessary to perform single-bit sampling and quantization on the real and imaginary parts of the signal respectively. The above formula can be expressed as:

[0089] s′(t)=sign(real(s(t)))+j·sign(imag(s(t)))

[0090] In the above formula, real[·] and imag[·] represent the real and imaginary part operations, respectively, sign[·] represents the sign bit operation, and s′(t) represents the signal after single-bit sampling and quantization of the radar signal.

[0091] In step S130, the single-bit sampled and quantized signal s′(t) is compared with the two-dimensional false target distance template s amp (m, n) is convolved to obtain the interference signal and false target signal acting on the target radar.

[0092] Assume that the two-dimensional false target distance template s amp The instantaneous range image within the mth pulse in (m, n) is recorded as RP m , then the interference signal emitted in each pulse can be expressed as:

[0093]

[0094] like Figure 2 As shown in FIG, it is a schematic diagram of the overall process of generating a false target signal, i.e., an interference signal.

[0095] In order to further verify the effectiveness of the present invention, two simulation experiments are used to illustrate it.

[0096] Experiment 1 verifies the jamming effect of the jamming signal generated by the periodic two-phase modulation method in the fast and slow time domains. The false target is an aircraft model containing 74 scattering points, such as Figure 3 As shown in the figure, the radar system transmits a waveform with a pulse width of 10μs, a bandwidth of 300MHz, a carrier frequency of 10GHz, and a pulse repetition frequency of 1kHz. The fast time domain modulation period is 0.09μs, and the duty cycle is The slow time domain modulation period is 0.004s, and the duty cycle The ISAR image of the interference signal after phase modulation in the fast and slow domains is shown in Figure 4. Then, amplitude modulation is performed on it, and the ISAR image of each false target is multiplied by different coefficients to obtain the modulated ISAR image as shown in Figure 4. Figure 5 shown.

[0097] Experiment 2 verifies the interference effect of the interference signal generated by the convolution method of the single-bit sampling quantization signal and the range image template. The experimental parameters are the same as those of Experiment 1. The radar transmission signal is convolved with the amplitude-modulated range image data after single-bit sampling quantization, and the imaging result of the interference signal is as follows: Figure 6 As shown in the results, it can be seen that the number, position and target amplitude distribution of false targets generated by this method are similar to those of Figure 5 Similarly, it is verified that this method can generate multiple false targets with controllable intensity in two dimensions.

[0098] In the above-mentioned ISAR two-dimensional false target generation method, based on single-bit sampling quantization and phase modulation, ISAR two-dimensional false targets are generated. By performing single-bit sampling quantization on the intercepted radar signal and combining it with the periodic two-phase phase modulation technology that introduces amplitude modulation, two-dimensional multiple false target interference is generated on the ISAR radar. This method adopts single-bit sampling quantization technology, which can reduce the resource consumption of the jammer to store radar signals, and greatly reduces the complexity of single-bit signal operations, especially multiplication operations, reducing the computing resource consumption of the jammer. At the same time, amplitude modulation is introduced on the basis of the method of generating two-dimensional false targets by periodic phase modulation, so that the authenticity of the interference effect is enhanced.

[0099] It should be understood that although Figure 1 The steps in the flowchart are shown in sequence as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified in this document, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders. In addition, Figure 1 At least part of the steps may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed in turn or alternately with other steps or at least part of the sub-steps or stages of other steps.

[0100] In one embodiment, Figure 7 As shown, an ISAR two-dimensional false target generation device is provided, comprising: a radar signal acquisition module 200, a two-dimensional false target range template generation module 210, a radar signal processing module 220 and a false target signal generation module 230, wherein:

[0101] A radar signal acquisition module 200 is used to acquire an intercepted radar signal, where the radar signal is a signal transmitted by an inverse synthetic aperture radar;

[0102] A two-dimensional false target distance template generation module 210 is configured to generate a two-dimensional false target distance template based on periodic two-phase modulation technology according to the parameters of the radar signal and preset false target-related requirement information;

[0103] a radar signal processing module 220, configured to perform single-bit sampling and quantization processing on the radar signal to obtain a processed radar signal;

[0104] The false target signal generating module 230 is configured to perform a convolution operation on the processed radar signal and a two-dimensional false target range template to obtain a false target signal acting on the radar signal.

[0105] The specific definitions of the ISAR 2D decoy target generation device can be found in the definitions of the ISAR 2D decoy target generation method described above and will not be repeated here. Each module in the aforementioned ISAR 2D decoy target generation device can be implemented in whole or in part via software, hardware, or a combination thereof. Each of these modules can be embedded in or independent of a processor in a computer device in hardware form, or stored in a computer device memory in software form, so that the processor can call and execute the corresponding operations of each module.

[0106] In one embodiment, a computer device is provided. The computer device may be a terminal, and its internal structure diagram may be as follows: Figure 8 As shown. The computer device includes a processor, a memory, a network interface, a display screen and an input device connected via a system bus. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The network interface of the computer device is used to communicate with an external terminal via a network connection. When the computer program is executed by the processor, a method for generating a two-dimensional false target for ISAR is implemented. The display screen of the computer device can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device can be a touch layer covering the display screen, or a key, trackball or touchpad provided on the computer device housing, or an external keyboard, touchpad or mouse.

[0107] Those skilled in the art will understand that Figure 8 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than shown in the figure, or combine certain components, or have a different component arrangement.

[0108] In one embodiment, a computer device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the computer program, the following steps are implemented:

[0109] Acquiring an intercepted radar signal, where the radar signal is a signal transmitted by an inverse synthetic aperture radar;

[0110] Based on the periodic two-phase phase modulation technology, a two-dimensional false target distance template is generated according to the parameters of the radar signal and the preset false target-related requirement information;

[0111] performing single-bit sampling and quantization processing on the radar signal to obtain a processed radar signal;

[0112] The processed radar signal is convolved with a two-dimensional false target range template to obtain a false target signal acting on the radar signal.

[0113] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the following steps are implemented:

[0114] Acquiring an intercepted radar signal, where the radar signal is a signal transmitted by an inverse synthetic aperture radar;

[0115] Based on the periodic two-phase phase modulation technology, a two-dimensional false target distance template is generated according to the parameters of the radar signal and the preset false target-related requirement information;

[0116] performing single-bit sampling and quantization processing on the radar signal to obtain a processed radar signal;

[0117] The processed radar signal is convolved with a two-dimensional false target range template to obtain a false target signal acting on the radar signal.

[0118] Those skilled in the art will appreciate that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0119] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0120] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art could make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A method for generating a two-dimensional false target for ISAR, characterized in that: The method comprises: Acquiring an intercepted radar signal, where the radar signal is a signal transmitted by an inverse synthetic aperture radar; Based on the periodic two-phase phase modulation technology, a two-dimensional false target range template is generated according to the parameters of the radar signal and the preset scattering characteristics and range characteristics of a single false target. Specifically, a false target echo signal of a single false target is constructed according to the parameters of the radar signal and the preset scattering characteristics and range characteristics of the single false target. The false target echo signal is subjected to periodic two-phase modulation in the fast time domain and the slow time domain to obtain a modulated signal having multiple false targets. The modulated signal is subjected to range pulse compression, azimuth Fourier transform, and range calibration to obtain an ISAR image. The ISAR image is amplitude modulated and then the amplitude-modulated ISAR image is subjected to an inverse Fourier transform in azimuth to obtain the two-dimensional false target range template. The false target echo signal is expressed as: In the above formula, Indicates the carrier frequency, Indicates frequency modulation. Indicates the pulse width, represents the signal bandwidth, and Represent the time index of fast time dimension and slow time dimension respectively, , full time , represents the pulse repetition interval, Indicates a single false target The intensity of the scattering point, Indicates the number of scattering points of a single false target, Indicates the The time delay of each scattering point; performing single-bit sampling and quantization processing on the radar signal to obtain a processed radar signal; The processed radar signal is convolved with a two-dimensional false target range template to obtain a false target signal acting on the radar signal.

2. The ISAR two-dimensional false target generation method according to claim 1, characterized in that: When amplitude modulation is performed on the ISAR image: In the ISAR image, for the area corresponding to each false target, different coefficient matrices are used to perform amplitude enhancement.

3. The ISAR two-dimensional false target generation method according to claim 2, characterized in that: The modulated signal is expressed as: In the above formula, and are periodic two-phase phase modulation sequences in the fast time domain and slow time domain, respectively, and satisfy the common form: In the above formula, Represents the pulse width of the sampled square wave signal, Indicates the modulation period.

4. The ISAR two-dimensional false target generation method according to claim 3, characterized in that: The radar signal is subjected to single-bit sampling and quantization processing, which is expressed as: In the above formula, and Represents the real and imaginary part operations, Indicates the sign bit operation. represents the radar signal.

5. An ISAR two-dimensional false target generation device, characterized in that: The device comprises: A radar signal acquisition module is used to acquire an intercepted radar signal, where the radar signal is a signal transmitted by an inverse synthetic aperture radar; A two-dimensional false target range template generation module is configured to generate a two-dimensional false target range template based on periodic two-phase modulation technology, according to the parameters of the radar signal and the preset scattering characteristics and range characteristics of a single false target. Specifically, based on the parameters of the radar signal and preset false target-related requirement information, a false target echo signal of a single false target is constructed, and periodic two-phase modulation is performed on the false target echo signal in the fast time domain and the slow time domain to obtain a modulated signal having multiple false targets. The modulated signal is subjected to range pulse compression, azimuth Fourier transform, and range calibration to obtain an ISAR image. After amplitude modulation is performed on the ISAR image, an inverse Fourier transform is performed on the amplitude-modulated ISAR image in azimuth to obtain the two-dimensional false target range template. The false target echo signal is expressed as: In the above formula, Indicates the carrier frequency, Indicates frequency modulation. Indicates the pulse width, represents the signal bandwidth, and Represent the time index of fast time dimension and slow time dimension respectively, , full time , represents the pulse repetition interval, Indicates a single false target The intensity of the scattering point, Indicates the number of scattering points of a single false target, Indicates the The time delay of each scattering point; a radar signal processing module, configured to perform single-bit sampling and quantization processing on the radar signal to obtain a processed radar signal; The false target signal generating module is used to perform a convolution operation on the processed radar signal and a two-dimensional false target range template to obtain a false target signal acting on the radar signal.

6. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 4 are implemented.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 4 are implemented.

Images