CN114791592A

CN114791592A - Synthetic aperture radar countermeasure simulation method, device, electronic equipment and medium

Info

Publication number: CN114791592A
Application number: CN202210732214.2A
Authority: CN
Inventors: 吴彦鸿; 张合敏
Original assignee: Beijing Hunray Technology Co ltd
Current assignee: Beijing Hunray Technology Co ltd
Priority date: 2022-06-27
Filing date: 2022-06-27
Publication date: 2022-07-26
Anticipated expiration: 2042-06-27
Also published as: CN114791592B

Abstract

The invention is suitable for the technical field of radar countermeasure, and provides a synthetic aperture radar countermeasure simulation method, a synthetic aperture radar countermeasure simulation device, electronic equipment and a medium, wherein the method comprises the following steps: setting parameters of a synthetic aperture radar, parameters of a target scene and parameters of a target to be detected; simulating and generating a baseband signal and a radar transmitting signal according to the synthetic aperture radar parameter and the target scene parameter; simulating an actual generation process of an echo signal according to the baseband signal, the target scene parameter and the target parameter to be detected to obtain the echo signal; the jammer receives the radar transmitting signal and transmits an interference signal, and the actual propagation process of the interference signal is simulated according to the target scene parameter and the jammer parameter to obtain a target interference signal; performing superposition summation processing on the echo signal and the target interference signal to obtain a countermeasure signal; imaging the countermeasure signal to obtain target imaging data; the problem of big grade of difficulty of obtaining of synthetic aperture radar confrontation data based on material object among the prior art is solved.

Description

Synthetic aperture radar countermeasure simulation method, device, electronic equipment and medium

Technical Field

The present application relates to the field of radar countermeasure technologies, and in particular, to a synthetic aperture radar countermeasure simulation method, apparatus, electronic device, and medium.

Background

With the development of electronic warfare technologies and the widespread use of equipment, the testing/training requirements for synthetic aperture radar countermeasure equipment are increasing. The SAR (synthetic Aperture radar), namely a synthetic Aperture radar, is carried on an air or space platform such as a satellite, an airplane, an unmanned aerial vehicle and the like, can work in a plurality of radio frequency bands such as L, C, X, Ku and the like, and can perform long-distance high-resolution imaging reconnaissance to the ground all day long and all day long to obtain ground target information. The testing/training activities with the synthetic aperture radar based on the real object as the object need to be realized by combining a plurality of field technologies and matching technical personnel in a plurality of fields, and not only need to relate to a plurality of complex equipment such as an SAR platform, SAR radar load, a reconnaissance/interference machine, a measuring instrument, evaluation and the like, but also have the problems of large implementation difficulty, high time and labor cost and the like. However, aspects such as SAR system design and algorithm validation require large amounts of raw data that is expensive and impractical to obtain through actual flight testing.

Disclosure of Invention

The invention provides a synthetic aperture radar countermeasure simulation method, a synthetic aperture radar countermeasure simulation device, electronic equipment and a synthetic aperture radar countermeasure simulation medium, and aims to solve the problems that in the prior art, acquisition difficulty of physical-based synthetic aperture radar countermeasure data is high and the like.

The invention provides a synthetic aperture radar confrontation simulation method, which comprises the following steps:

setting parameters of a synthetic aperture radar, parameters of a target scene and parameters of a target to be detected;

simulating and generating a baseband signal and a radar transmitting signal according to the synthetic aperture radar parameter and the target scene parameter;

simulating an actual generation process of an echo signal according to the baseband signal, the target scene parameter and the target parameter to be detected to obtain an echo signal;

setting parameters of an interference machine, transmitting the radar transmitting signal to the interference machine, receiving the radar transmitting signal by the interference machine, transmitting an interference signal, and simulating an actual propagation process of the interference signal according to the target scene parameters and the parameters of the interference machine to obtain a target interference signal;

performing superposition summation processing on the echo signal and the target interference signal to obtain a countermeasure signal;

and imaging the confrontation signal to obtain target imaging data.

Optionally, the simulating and generating a baseband signal and a radar transmission signal according to the synthetic aperture radar parameter and the target scene parameter includes:

simulating to generate a baseband signal according to the synthetic aperture radar signal and the target scene parameter;

and performing first space propagation simulation on the baseband signal according to the target scene parameters to obtain the radar emission signal.

Optionally, the performing a first spatial propagation simulation on the baseband signal according to the target scene parameter to obtain the radar emission signal includes:

performing first space propagation simulation on the baseband signal according to the target scene parameter to obtain a transmitting signal;

and carrying out modulation processing and demodulation processing on the transmitting signals in sequence to obtain the radar transmitting signals.

Optionally, the simulating an actual generation process of an echo signal according to the baseband signal, the target scene parameter, and the target parameter to be detected to obtain an echo signal includes:

and sequentially performing second space propagation simulation, target scene and target reflection simulation and second space propagation simulation on the baseband signals according to the target scene parameters and the target parameters to be detected to obtain echo signals.

Optionally, after the imaging processing is performed on the objective countermeasure signal to obtain target imaging data, the method further includes:

acquiring demand data, and adjusting parameters of an interference machine according to the demand data;

simulating the actual transmission process of the interference signal according to the adjusted interference machine parameters and the target scene to obtain an adjusted target interference signal;

performing the superposition summation processing according to the adjusted target interference signal and the echo signal to obtain a first antagonistic signal;

and imaging the first antagonizing signal to obtain first target imaging data.

Optionally, after the performing the imaging processing on the first countering signal to obtain first target imaging data, the method further includes:

acquiring an interference scene according to the interference machine parameters, and performing first feature extraction on the first target imaging data based on the interference scene to obtain first features;

performing second feature extraction on the first target imaging data by adopting a preset feature extraction model to obtain second features;

performing feature fusion processing on the first feature and the second feature to obtain fusion features;

and acquiring a performance evaluation result of the first target imaging data according to the fusion characteristic.

Optionally, after the imaging processing is performed on the countermeasure signal to obtain target imaging data, the method further includes:

adjusting the synthetic aperture radar parameter and the target scene parameter according to the demand data, and simulating to generate a target baseband signal according to the adjusted synthetic aperture radar parameter and the adjusted target scene parameter;

obtaining a target echo signal according to the actual generation process of the target baseband signal, the adjusted synthetic aperture radar parameter and the adjusted target scene parameter target echo signal;

the target echo signal and the interference signal are subjected to superposition summation processing to obtain a second antagonistic signal;

imaging the second antagonizing signal to obtain second target imaging data;

and acquiring second target imaging data under a plurality of target scenes, and respectively performing target performance evaluation on the second target imaging data under the plurality of target scenes to obtain a target evaluation result.

The invention also provides a synthetic aperture radar confrontation simulation device, which comprises:

the data simulation system comprises a parameter setting module, a signal generating module, an echo signal module, an interference signal module, a countermeasure signal module and a signal imaging module, wherein the parameter setting module is respectively connected with the signal generating module, the echo signal module and the interference signal module, and the countermeasure signal module is respectively connected with the echo signal module, the interference signal module and the signal imaging module;

the signal interference system comprises an interference machine and is connected with the data simulation system through the interference signal module;

the parameter setting module is used for setting synthetic aperture radar parameters, target scene parameters and target parameters to be detected;

the signal generation module is used for simulating and generating a baseband signal and a radar transmitting signal according to the synthetic aperture radar parameter and the target scene parameter;

the echo signal module is used for simulating the actual generation process of an echo signal according to the baseband signal, the target scene parameters and the target parameters to be detected to obtain an echo signal;

the interference signal module is used for setting interference machine parameters, transmitting the radar transmitting signals to an interference machine, receiving the radar transmitting signals and transmitting interference signals by the interference machine, and simulating the actual propagation process of the interference signals according to the target scene parameters and the interference machine parameters to obtain target interference signals;

the countermeasure signal module is used for carrying out superposition summation processing on the echo signal and the target interference signal to obtain a countermeasure signal;

the signal imaging module is used for imaging the countermeasure signal to obtain target imaging data, and the parameter setting module, the signal generating module, the echo signal module, the interference signal module, the countermeasure signal module and the signal imaging module are connected.

The present invention also provides an electronic device, comprising: a processor and a memory;

the memory is configured to store a computer program and the processor is configured to execute the computer program stored by the memory to cause the electronic device to perform the synthetic aperture radar countermeasure simulation method.

The invention also provides a computer-readable storage medium having stored thereon a computer program which, when being executed by a processor, carries out the synthetic aperture radar countermeasure simulation method as described above.

The invention has the beneficial effects that: the synthetic aperture radar countermeasure simulation method comprises the steps of obtaining synthetic aperture radar parameters and target scene parameters, simulating to generate a baseband signal and a radar transmitting signal, then simulating to generate an echo signal and a target interference signal, and obtaining imaging data after the echo signal and the target interference signal are subjected to superposition processing and imaging processing in sequence; therefore, simulation of synthetic aperture radar countermeasure is achieved, and the problems that in the prior art, acquisition difficulty of synthetic aperture radar countermeasure data based on real objects is high and the like are solved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic flow chart of a synthetic aperture radar countermeasure simulation method according to an embodiment of the invention;

FIG. 2 is a schematic flow chart of a method for acquiring a radar transmission signal according to an embodiment of the present invention;

FIG. 3 is another schematic flow chart of the synthetic aperture radar countermeasure simulation method in the embodiment of the invention;

FIG. 4 is a block diagram of a SAR confrontation simulation device according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of an electronic device in an embodiment of the present invention.

Detailed Description

The following embodiments of the present invention are provided by way of specific examples, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the features in the following embodiments and examples may be combined with each other without conflict.

It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the drawings only show the components related to the present invention rather than being drawn according to the number, shape and size of the components in actual implementation, and the type, amount and proportion of each component in actual implementation can be changed freely, and the layout of the components can be more complicated.

The Synthetic Aperture Radar (SAR) is carried on an air or space platform such as a satellite, an airplane, an unmanned aerial vehicle and the like, can work in a plurality of radio frequency bands such as L, C, X, Ku and the like, can carry out long-distance high-resolution ground imaging reconnaissance all day long and all day long, and can obtain ground target information. In the SAR countermeasure simulation system based on the actual installation, for a target echo signal, an SAR emission signal is subjected to spatial propagation, is reflected by a target and then reaches an SAR receiving antenna through the spatial propagation, for an interference signal, the SAR emission signal is subjected to the spatial propagation, is subjected to the reconnaissance receiving processing by an interference machine and then reaches the SAR receiving antenna through the back propagation, and the receiving antenna is equivalent to a summator, and the target echo signal and the interference signal are superposed and then are subjected to the subsequent processing. All units are installed in a real mode, and must carry an aerial or space platform to fly, the system is complex, the manufacturing cost is high, the system generally does not have a multiband function, a primary flight route can only work in one mode, data set by a scene, a target and an interference machine parameter are obtained, and the work is ensured to be complicated. In order to solve the above problem, the present embodiment proposes a synthetic aperture radar countermeasure simulation method.

In order to illustrate the technical means of the present invention, the following description is given by way of specific examples.

Fig. 1 is a schematic flowchart of a synthetic aperture radar countermeasure simulation method according to an embodiment of the invention.

As shown in fig. 1, the synthetic aperture radar countermeasure simulation method includes steps S110 to S160:

s110, setting synthetic aperture radar parameters, target scene parameters and target parameters to be detected;

s120, generating a baseband signal and a radar transmitting signal according to the synthetic aperture radar parameter and the target scene parameter in a simulation mode;

s130, simulating an actual generation process of an echo signal according to the baseband signal, the target scene parameter and the target parameter to be detected to obtain the echo signal;

s140, setting parameters of an interference machine, transmitting the radar transmitting signal to the interference machine, receiving the radar transmitting signal by the interference machine, transmitting an interference signal, and simulating an actual propagation process of the interference signal according to the target scene parameters and the parameters of the interference machine to obtain a target interference signal;

s150, performing superposition summation processing on the echo signal and the target interference signal to obtain a countermeasure signal;

and S160, imaging the contrast signal to obtain target imaging data.

It should be noted that the synthetic aperture radar countermeasure simulation method is applied to a synthetic aperture radar countermeasure device, the synthetic aperture radar countermeasure device includes a data simulation system and a signal interference system, and the data simulation system is connected with the signal interference system. The data simulation system realizes the setting of parameters of the synthetic aperture radar and parameters of a target scene, the simulation of baseband signals and radar transmitting signals, the simulation of echo signals, the simulation of target interference signals, the simulation of countermeasure signals, the imaging processing and other processes. Before setting the synthetic aperture radar parameters, the target scene parameters and the target parameters to be detected, a data simulation system is required to be constructed. The data simulation system consists of a server and a client; the server is mainly used for database association and simulation process control, the database management relates to the management of synthetic aperture radar parameters, target scenes, target parameters to be detected and task scenes, and the simulation process comprises the starting, ending and pausing of the simulation process and the simulation of baseband signals, radar emission signals, echo signals, target interference signals, countermeasure signals and target imaging data. The client is mainly used for displaying simulation results in real time and providing analysis and research. The same task scene can realize the operation and display of a plurality of clients.

It should be noted that the parameters of the synthetic aperture radar include the working frequency, resolution, system parameters of the synthetic aperture radar and the working parameters of each extension; synthetic aperture radar parameters include, but are not limited to, transmit power, signal bandwidth, system loss, pulse width, Pulse Repetition Frequency (PRF) parameters, and the like. The target scene parameters comprise generation scene parameters (platform height, speed, imaging distance and imaging range) of baseband signals, actual motion parameters of targets and countermeasure signal generation parameters, the targets to be detected are targets to be detected by the synthetic aperture radar, the targets to be detected comprise point targets and distribution targets, and if the targets to be detected are the distribution targets, the parameters of the targets to be detected comprise but are not limited to the number of points, the intervals among the points and the areas of the distribution targets. In particular, the flight platform parameters and the echo generation model also need to be set. Acquiring demand data, determining the demand data according to the actual demand of a user, and configuring parameters of the synthetic aperture radar, parameters of a target scene, parameters of a target to be detected and parameters of a flight platform in a data simulation system according to the demand data. Specifically, a baseband signal is generated through simulation according to the parameters of the synthetic aperture radar and the parameters of a target scene, namely the baseband signal is generated by utilizing the principle that the signal phase process caused by the space delay and change corresponding to space propagation is equivalent at radio frequency and baseband; and simulating to generate a baseband signal according to the synthetic aperture radar parameter, the target scene parameter and the flight platform parameter.

Referring to fig. 2, the simulation of generating the baseband signal and the radar transmission signal according to the synthetic aperture radar parameter and the target scene parameter may include the following steps:

s210, generating a baseband signal according to the synthetic aperture radar signal and the target scene parameter in a simulation mode;

and S220, performing first space propagation simulation on the baseband signal according to the target scene parameters to obtain a radar transmitting signal.

Specifically, the baseband signal may be generated based on synthetic aperture radar parameters, target scene parameters, and flight platform parameters. Carrying out first space propagation simulation on the baseband signal according to the target scene parameters to obtain a radar transmitting signal, and the method comprises the following steps: performing first space propagation simulation on the baseband signal according to the target scene parameter to obtain a transmitting signal; and carrying out modulation processing and demodulation processing on the transmitted signals in sequence to obtain radar transmitted signals. Sequentially modulating and demodulating the transmitting signals to obtain radar transmitting signals, wherein the radar transmitting signals comprise baseband signals subjected to first space propagation simulation according to target scene parameters to obtain transmitting signals; and carrying out modulation processing and demodulation processing on the transmitting signals in sequence to obtain radar transmitting signals. The first spatial propagation simulation is determined from a spatial propagation process of the baseband signal from the synthetic aperture radar to the jammer.

It should be noted that the main effect caused by signal space propagation is time delay and its variation, which is shown in radar signals including signal envelope delay, signal phase variation, frequency variation (doppler), etc., and therefore, echo signal/interference signal propagation has the characteristic of delayed series superposition. The characteristic of delayed series superposition refers to that the total time delay in the actual propagation of signals (including circuit transmission, space propagation and the like) is the superposition of the time delay of each link, and is not related to the sequence. The method for achieving the echo signal comprises the steps of sequentially carrying out second space propagation simulation, target scene and target reflection simulation to be detected and third space propagation simulation on the baseband signal according to the target scene parameters and the target parameters to be detected to obtain the echo signal. The base band signal is subjected to second space propagation simulation, target scene and target reflection simulation and third space propagation simulation in sequence, so that the echo signal with the space propagation characteristic, the scene and the target reflection characteristic is obtained, the echo signal is simulated, the system design is greatly simplified, and the cost is reduced. Specifically, the second spatial propagation simulation is determined from a spatial propagation process of the baseband signal from the synthetic aperture radar to the target, and the third spatial propagation simulation is determined from a spatial propagation process of the baseband signal reflected by the target from the target to the synthetic aperture radar.

Performing first space propagation simulation on the baseband signal according to target scene parameters based on the time delay series superposition characteristics of the interference signal to obtain a radar emission signal; setting parameters of an interference machine, transmitting radar transmitting signals to the interference machine, receiving the radar transmitting signals and transmitting interference signals by the interference machine, and simulating an actual propagation process of the interference signals according to the target scene parameters and the parameters of the interference machine to obtain target interference signals. The first spatial propagation simulation is determined from a spatial propagation process of a baseband signal from the synthetic aperture radar to the jammer. And simulating an actual propagation process of the interference signal according to the target scene parameters and the parameters of the interference machine, wherein the actual propagation process is determined according to a space propagation process from the interference machine to the synthetic aperture radar according to the interference signal.

Specifically, the signal interference system may be an interferer and a modulation component/demodulation component, and the signal interference system may also be an interferer, an interferer transceiver antenna, and a modulation component/demodulation component.

If the signal interference system is only composed of an interference machine, the implementation method for obtaining the target interference signal may include: simulating and generating a baseband signal according to the synthetic aperture radar parameter and the target scene parameter; performing first space propagation simulation on the baseband signal according to the target scene parameters to obtain a radar transmitting signal; after the radar transmitting signals are cached and played back through the data interface, the radar transmitting signals are sent to the jammer, the jammer receives the radar transmitting signals and carries out first signal processing, and jamming signals are obtained; and simulating the actual propagation process of the interference signal according to the target scene parameters and the parameters of the interference machine to obtain the target interference signal. The first signal processing process comprises the modulation transmission of radar transmission signals, the transmission simulation of the modulated radar transmission signals from the synthetic aperture radar receiving and transmitting antenna to the jammer antenna, the receiving simulation of the signals from the jammer antenna to the synthetic aperture radar receiving and transmitting antenna, and the receiving demodulation of the signals by the demodulation component. And in the actual transmission process of the interference signal according to the target scene parameters and the parameters of the interference machine, the actual transmission process is determined according to the space transmission process from the interference machine to the synthetic aperture radar according to the interference signal. After the target interference signal is obtained, the target interference signal can be led into a data simulation system through a data interface. Therefore, the signal interference system consisting of the jammer can be used for connecting the data simulation system with the jammer in a wired mode without using a synthetic aperture radar receiving and transmitting antenna and a modulation/demodulation component so as to meet the test/experiment requirements of the jammer.

If the signal interference system is composed of an interference unit and a modulation component/demodulation component, the implementation method for obtaining the target interference signal may include: simulating and generating a baseband signal according to the synthetic aperture radar parameter and the target scene parameter; performing first space propagation simulation on the baseband signal according to the target scene parameters to obtain a radar transmitting signal; after the radar emission signal is cached and played back data through a data interface, modulating the radar by adopting a modulation component to obtain a modulation signal; receiving and demodulating the modulation signal by using a demodulation component to obtain a demodulation signal; transmitting a demodulation signal to an interference machine, receiving the demodulation signal by the interference machine and carrying out second signal processing to obtain an interference signal; and simulating the actual propagation process of the interference signal according to the target scene parameters and the parameters of the interference machine to obtain the target interference signal. The second signal processing process includes: the simulation of the transmission of radar transmission signals from the synthetic aperture radar transceiver antenna to the jammer antenna and the simulation of the reception of signals from the jammer antenna to the synthetic aperture radar transceiver antenna. Therefore, the signal interference system consisting of the jammer, the modulation component and the demodulation component can connect the data simulation system with the jammer in a wired mode (wire feeding) without using a synthetic aperture radar receiving and transmitting antenna so as to meet indoor testing/training requirements.

If the signal interference system is composed of an interferer, a modulation/demodulation component, and an interferer transceiver antenna, the implementation method for obtaining the target interference signal may include: simulating and generating a baseband signal according to the synthetic aperture radar parameter and the target scene parameter; performing first space propagation simulation on the baseband signal according to the target scene parameters to obtain a radar transmitting signal; after the radar transmitting signals are cached and played back through a data interface, the radar transmitting signals are received by an interference machine receiving and transmitting antenna, and then the radar transmitting signals are modulated by a modulation component to obtain modulation signals; receiving and demodulating the modulation signal by using a demodulation component to obtain a demodulation signal; transmitting a demodulation signal to an interference machine, wherein the interference machine receives the demodulation signal and transmits an interference signal by adopting an interference machine transceiver antenna; and simulating the actual propagation process of the interference signal according to the target scene parameters and the parameters of the interference machine to obtain the target interference signal. The interference machine transceiver antenna is used for receiving radar transmitting signals and sending interference signals, the interference machine transceiver antenna can be directly connected with a reconnaissance/interference machine in a mounting mode, a computer model is used for simulating signal space propagation, the simulation of SAR platform movement and interference machine movement is realized under the condition that platform flight/movement is not needed, the test/training guarantee requirements are greatly reduced, more effective data can be obtained under the ground static environment, and the reliability of evaluation/evaluation of synthetic aperture radar countermeasure data is improved.

In an embodiment, the imaging processing the anti-contrast signal to obtain the target imaging data further includes: acquiring demand data, and adjusting parameters of the jammers according to the demand data; obtaining an adjusted target interference signal according to the adjusted parameters of the interference machine and the actual propagation process of the target scene simulation interference signal; performing superposition summation processing according to the adjusted target interference signal and the echo signal to obtain a first antagonistic signal; and imaging the first antagonizing signal to obtain first target imaging data. The demand data can be set according to actual conditions, corresponding parameters of the interference machine are set by acquiring various different demand data, so that a large number of interference images under different interference levels are generated, and the problem of insufficient interference evaluation samples is solved.

In one embodiment, first target imaging data is obtained, and a performance evaluation may be performed on the first target imaging data. Performing a performance evaluation on the first target imaging data includes: acquiring an interference scene according to the parameters of the interference machine, and performing first feature extraction on the first target imaging data based on the interference scene to obtain first features; performing second feature extraction on the first target imaging data by adopting a preset feature extraction model to obtain second features; performing feature fusion processing on the first feature and the second feature to obtain fusion features; and acquiring a performance evaluation result of the first target imaging data according to the fusion characteristics. Specifically, after an interference scene is acquired, acquiring a real synthetic aperture radar image without an interference signal; then, acquiring a gray map (a first gray map) of a real synthetic aperture radar image and a gray map (a second gray map) of an image corresponding to the first target imaging data; the first feature extraction is carried out on the first target imaging data to obtain a first feature, and the first feature is obtained by comparing the gray value difference of the same position of the first gray map and the second gray map.

In an embodiment, in the step of performing second feature extraction on the first target imaging data by using a preset feature extraction model to obtain a second feature, the preset feature extraction model includes a convolutional neural network model, and the preset feature extraction model is obtained in a manner of obtaining a sample synthetic aperture radar image to form a sample data set (the sample synthetic aperture radar image is a synthetic aperture radar image formed based on an interference signal); and constructing a convolutional neural network model, and training the convolutional neural network model by adopting a sample data set to obtain a preset feature extraction model for obtaining the effectiveness of the interference. Performing second feature extraction on the target imaging data by adopting a preset feature extraction model obtained by training to obtain second features

In an embodiment, the feature fusion processing is performed on the first feature and the second feature, and the obtaining of the fusion feature comprises inputting the first feature and the second feature into a full connection layer to obtain the fusion feature; and acquiring a performance evaluation result of the first target imaging data according to the fusion feature, wherein the performance evaluation result is obtained after the fusion feature passes through an activation function. The first characteristic and the second characteristic are extracted from the first target imaging data, and the first characteristic and the second characteristic are fused in a nonlinear fusion mode, so that the performance of the interference image is accurately evaluated.

It should be noted that, in the synthetic aperture radar device based on real object, the echo signal and the interference signal entering the SAR receiving antenna can be represented as additive combination, and they are subjected to the same linear processing in the imaging processor before the output complex image is subjected to modulo conversion into a grayscale image, so that the echo signal and the interference signal can be independently processed respectively in the process from the front end of the receiver to the image before output and can be superimposed in any point linearity, that is, the interference signal and the echo signal have signal linear superposition characteristics. Therefore, in the embodiment, the echo signal and the target interference signal are obtained by respectively simulating the simulated baseband signals, and then the echo signal and the target interference signal are subjected to superposition and summation processing to obtain the countermeasure signal; the echo signal and the target interference signal can be superposed without a synthetic aperture radar receiving antenna, so that a confrontation signal is obtained, and the simulation of the confrontation of the synthetic aperture radar is realized. Based on the signal linear superposition characteristic and the delay series superposition characteristic, the simulation of radio wave space propagation and scene and target echo caused by the flight process with the maximum simulation difficulty are realized in a computer, and the problems that the acquisition difficulty of the synthetic aperture radar countermeasure data based on the real object is large in the prior art are solved.

Referring to fig. 3, the synthetic aperture radar method in the present embodiment generates a baseband signal by using the principle that the signal phase process caused by the spatial delay and change corresponding to the spatial propagation is equivalent at radio frequency and baseband; adding a space propagation process, simulating the space propagation of a transmitting signal, simulating the space propagation of a reflecting signal after the reflecting of a scene and a target, and generating an echo signal with space propagation characteristics and scene and target reflection characteristics; the method comprises the steps that by the same principle, space propagation of SAR emission signals is simulated at an emission end, data are cached and played back through a data interface, the data are radiated through an antenna through modulation and emission, an interference machine receives the SAR radar emission signals and generates interference signals, the interference signals are received and demodulated by an SAR receiving antenna, the data are collected and stored through the data interface and enter a data simulation system (computer), the scene and target echoes and the emission, reflection/forwarding, propagation and receiving processes of the interference signals are completed when the interference signals are simulated in the space propagation of a baseband and reach a summator, the summator linearly adds the scene and target echoes and the interference signals to obtain data in a confrontation environment, imaging processing and subsequent evaluation and evaluation are carried out on the data, and then the confrontation test/training process is completed.

It should be noted that, after the countermeasure signal is imaged to obtain target imaging data, synthetic aperture radar parameters can be adjusted to obtain target imaging data under different synthetic aperture radar parameters; target scene parameters can be adjusted, so that target imaging data under different scenes are obtained; the parameters of the target to be detected can be adjusted, so that target imaging data corresponding to different targets are obtained; the parameters of the flight platform can be adjusted, so that target imaging data under different flight platform parameters are obtained; therefore, the synthetic aperture radar confrontation simulation method in the embodiment can be used for simulating SAR of various platforms, various scenes and various parameters by applying various models in a computer. Specifically, the method for acquiring the target imaging data includes acquiring demand data, adjusting parameters of the synthetic aperture radar according to the demand data, and acquiring target imaging data according to the adjusted parameters of the synthetic aperture radar, so as to acquire target imaging data under different parameters of the synthetic aperture radar, and further acquire target imaging data under multiple parameters of the synthetic aperture radar, and the method for acquiring the target imaging data may refer to steps S120 to S160. Adjusting target scene parameters according to the demand data, and acquiring target imaging data according to the adjusted target scene parameters, thereby acquiring target imaging data under different target scene parameters, and further acquiring target imaging data under multiple target scene parameters, wherein the target imaging data acquiring method can refer to steps S120-S160. And acquiring target imaging data according to the adjusted flight platform parameters, thereby acquiring target imaging data under different flight platform parameters, and further acquiring target imaging data under multiple flight platform parameters, wherein the target imaging data acquisition method can refer to the steps S120-S160. Adjusting the parameters of the target to be detected according to the demand data, and acquiring target imaging data according to the adjusted parameters of the target to be detected, thereby acquiring target imaging data corresponding to different parameters of the target to be detected

It should be noted that, after the countermeasure signal is subjected to imaging processing to obtain target imaging data, target imaging data in a plurality of target scenes may also be obtained, and target performance evaluation is performed on the target imaging data in the plurality of target scenes to obtain target evaluation results. Performance evaluations include, but are not limited to, radar performance evaluations, target detection performance evaluations, interference performance evaluations; the performance evaluation of the imaging data is convenient to obtain evaluation results of different scenes under the current synthetic aperture parameters, so that the current synthetic aperture radar is screened out to be more suitable for detecting which scenes. Imaging the countermeasure signal to obtain target imaging data, then acquiring target imaging data under a plurality of synthetic aperture radar parameters, and respectively performing target performance evaluation on the target imaging data under the plurality of synthetic aperture radar parameters to obtain a target evaluation result; therefore, the method screens out which synthetic aperture radar parameters under the current scene to have better detection effect. And acquiring a plurality of synthetic aperture radar parameters and target imaging data under a plurality of scene parameters, and evaluating the target performance, so that the application range of which synthetic aperture radar parameter is screened out is wide.

In an embodiment, an implementation method for acquiring target imaging data in different target scenes and performing performance evaluation may include: adjusting the synthetic aperture radar parameters and the target scene parameters according to the demand data, and simulating to generate a target baseband signal according to the adjusted synthetic aperture radar parameters and the adjusted target scene parameters; obtaining a target echo signal according to the actual generation process of the target baseband signal, the adjusted synthetic aperture radar parameter and the adjusted target scene parameter target echo signal; superposing and summing the target echo signal and the interference signal to obtain a second antagonistic signal; imaging the second antagonizing signal to obtain second target imaging data; and acquiring second target imaging data under a plurality of target scenes, and respectively performing target performance evaluation on the second target imaging data under the plurality of target scenes to obtain a target evaluation result.

Specifically, the synthetic aperture radar countermeasure simulation method realizes simulation of radio wave space propagation and scene and target echo caused by a flight process in SAR countermeasure testing/training in a data simulation system (in a computer) by simulating an echo signal; by simulation of the antagonistic signal. Scene and target echo simulation are completely completed in a data simulation system (computer), SAR transmits signals to an interference machine, the simulation of the space propagation process of the interference signals to an SAR receiving antenna is completed in the data simulation system (computer), and other processes are completed by the fact that the interference machine is installed; the simulation of the SAR platform motion and the jammer motion is realized under the condition that the platform flight/motion is not needed.

Based on the same inventive concept as the synthetic aperture radar countermeasure simulation method, correspondingly, the embodiment also provides a synthetic aperture radar countermeasure simulation device.

Fig. 4 is a schematic block diagram of a synthetic aperture radar countermeasure simulation apparatus according to the present invention.

As shown in fig. 4, the synthetic aperture radar countermeasure simulation apparatus 4 includes: the data simulation system comprises a parameter setting module, a signal generating module, an echo signal module, an interference signal module, a countermeasure signal module and a signal imaging module, wherein the parameter setting module is respectively connected with the signal generating module, the echo signal module and the interference signal module, and the countermeasure signal module is respectively connected with the echo signal module, the interference signal module and the signal imaging module;

the signal generation module is used for generating a baseband signal and a radar transmitting signal according to the synthetic aperture radar parameter and the target scene parameter in a simulation mode;

the echo signal module is used for simulating the actual generation process of the echo signal according to the baseband signal, the target scene parameter and the target parameter to be detected to obtain the echo signal;

the interference signal module is used for setting parameters of an interference machine, transmitting radar transmitting signals to the interference machine, receiving the radar transmitting signals and transmitting interference signals by the interference machine, and simulating the actual propagation process of the interference signals according to the target scene parameters and the parameters of the interference machine to obtain target interference signals;

the device comprises a signal imaging module, a parameter setting module, a signal generating module, an echo signal module, an interference signal module, a countermeasure signal module and a signal imaging module, wherein the signal imaging module is used for imaging the countermeasure signal to obtain target imaging data, and the parameter setting module, the signal generating module, the echo signal module, the interference signal module, the countermeasure signal module and the signal imaging module are connected.

It should be noted that the synthetic aperture radar parameters include the synthetic aperture radar operating frequency, resolution, system parameters and the operating parameters of each extension; synthetic aperture radar parameters include, but are not limited to, transmit power, signal bandwidth, system loss, pulse width, Pulse Repetition Frequency (PRF) parameters, and the like. The target scene parameters comprise generation scene parameters (platform height, speed, imaging distance and imaging range) of baseband signals, actual motion parameters of targets and generation parameters of countermeasure signals, the targets to be detected are targets to be detected by the synthetic aperture radar, the targets to be detected comprise point targets and distribution targets, and if the targets to be detected are the distribution targets, the parameters of the targets to be detected include but are not limited to the number of points, intervals among the points and areas of the distribution targets. In particular, the flight platform parameters and the echo generation model also need to be set. Acquiring demand data, determining the demand data according to the actual demand of a user, and configuring parameters of the synthetic aperture radar, parameters of a target scene, parameters of a target to be detected and parameters of a flight platform in a data simulation system according to the demand data. Specifically, a baseband signal is generated according to the synthetic aperture radar parameter and the target scene parameter simulation, namely the baseband signal is generated by utilizing the principle that the signal phase process caused by the space delay and the change corresponding to the space propagation is equivalent in radio frequency and baseband; and simulating to generate a baseband signal according to the synthetic aperture radar parameter, the target scene parameter and the flight platform parameter.

It should be noted that the main effect caused by signal space propagation is time delay and its variation, which is shown in radar signals including signal envelope delay, signal phase variation, frequency variation (doppler), and so on, and therefore, echo signal/interference signal propagation has the characteristic of delayed series superposition. The characteristic of delayed series superposition refers to that the total time delay in the actual propagation of signals (including circuit transmission, space propagation and the like) is the superposition of the time delay of each link, and is irrelevant to the sequence. The method for achieving the echo signal comprises the steps of sequentially carrying out second space propagation simulation, target scene and target to be detected reflection simulation and third space propagation simulation on the baseband signal according to the target scene parameter and the target parameter to be detected to obtain the echo signal. The second space propagation simulation, the target scene and target reflection simulation and the third space propagation simulation are sequentially carried out on the baseband signals, so that the echo signals with the space propagation characteristics, the scene and the target reflection characteristics are obtained, the simulation of the echo signals is realized, the system design is greatly simplified, and the cost is reduced. Specifically, the second spatial propagation simulation is determined from a spatial propagation process of the baseband signal from the synthetic aperture radar to the target, and the third spatial propagation simulation is determined from a spatial propagation process of the baseband signal reflected by the target from the target to the synthetic aperture radar.

Performing first space propagation simulation on the baseband signal according to target scene parameters based on the time delay series superposition characteristics of the interference signal to obtain a radar emission signal; setting parameters of an interference machine, transmitting radar transmitting signals to the interference machine, receiving the radar transmitting signals and transmitting interference signals by the interference machine, and simulating an actual propagation process of the interference signals according to the target scene parameters and the parameters of the interference machine to obtain target interference signals. The first spatial propagation simulation is determined from a spatial propagation process of a baseband signal from the synthetic aperture radar to the jammer. And in the actual transmission process of the interference signal according to the target scene parameters and the parameters of the interference machine, the actual transmission process is determined according to the space transmission process from the interference machine to the synthetic aperture radar according to the interference signal.

If the signal interference system is only composed of an interference machine, the implementation method for obtaining the target interference signal may include: simulating to generate a baseband signal according to the synthetic aperture radar parameter and the target scene parameter; performing first space propagation simulation on the baseband signal according to the target scene parameters to obtain a radar transmitting signal; after the radar transmitting signals are cached and played back through the data interface, the radar transmitting signals are sent to the jammer, the jammer receives the radar transmitting signals and carries out first signal processing, and jamming signals are obtained; and simulating the actual propagation process of the interference signal according to the target scene parameters and the parameters of the interference machine to obtain the target interference signal. The first signal processing process comprises modulation transmission of radar transmission signals, transmission simulation of the modulated radar transmission signals from the synthetic aperture radar transmitting and receiving antenna to the jammer antenna, receiving simulation of the signals from the jammer antenna to the synthetic aperture radar transmitting and receiving antenna, and receiving demodulation of the signals by the demodulation assembly. And in the actual transmission process of the interference signal according to the target scene parameters and the parameters of the interference machine, the actual transmission process is determined according to the space transmission process from the interference machine to the synthetic aperture radar according to the interference signal. After the target interference signal is obtained, the target interference signal can be led into the data simulation system through the data interface. Therefore, the data simulation system can be connected with the jammer by a signal interference system consisting of the jammers in a wired mode without using a synthetic aperture radar transceiving antenna and a modulation/demodulation component so as to meet the testing/experiment requirements of the jammers.

If the signal interference system is composed of an interference unit and a modulation component/demodulation component, the implementation method for obtaining the target interference signal may include: simulating to generate a baseband signal according to the synthetic aperture radar parameter and the target scene parameter; performing first space propagation simulation on the baseband signal according to the target scene parameters to obtain a radar transmitting signal; after the radar transmitting signals are cached and played back through a data interface, modulating the radar by adopting a modulation component to obtain modulation signals; receiving and demodulating the modulation signal by using a demodulation component to obtain a demodulation signal; transmitting the demodulation signal to an interference machine, receiving the demodulation signal by the interference machine and carrying out second signal processing to obtain an interference signal; and simulating the actual propagation process of the interference signal according to the target scene parameters and the parameters of the interference machine to obtain the target interference signal. The second signal processing process includes: the transmission of radar transmission signals from the synthetic aperture radar transceiver antenna to the jammer antenna is simulated and the reception of signals from the jammer antenna to the synthetic aperture radar transceiver antenna is simulated. Therefore, the signal interference system consisting of the jammer, the modulation component and the demodulation component can connect the data simulation system with the jammer in a wired mode (wire feeding) without using a synthetic aperture radar receiving and transmitting antenna so as to meet indoor testing/training requirements.

If the signal interference system is composed of an interference unit, a modulation/demodulation unit, and an interference unit transceiver antenna, the implementation method for obtaining the target interference signal may include: simulating to generate a baseband signal according to the synthetic aperture radar parameter and the target scene parameter; performing first space propagation simulation on the baseband signal according to the target scene parameters to obtain a radar emission signal; after the radar emission signal is cached and played back through a data interface, the radar emission signal is received by an interference machine receiving and sending antenna, and then the radar emission signal is modulated by a modulation component to obtain a modulation signal; receiving and demodulating the modulation signal by using a demodulation component to obtain a demodulation signal; transmitting a demodulation signal to an interference machine, receiving the demodulation signal by the interference machine and transmitting an interference signal by adopting an interference machine transceiver antenna; and simulating the actual propagation process of the interference signal according to the target scene parameters and the parameters of the interference machine to obtain the target interference signal. The interference machine transceiver antenna is used for receiving radar transmitting signals and sending interference signals, the interference machine transceiver antenna can be directly connected with a reconnaissance/interference machine in a mounting mode, a computer model is used for simulating signal space propagation, the simulation of SAR platform movement and interference machine movement is realized under the condition that platform flight/movement is not needed, the test/training guarantee requirements are greatly reduced, more effective data can be obtained under the ground static environment, and the reliability of evaluation/evaluation of synthetic aperture radar countermeasure data is improved.

It should be noted that, in the synthetic aperture radar device based on real object, the echo signal and the interference signal entering the SAR receiving antenna can be represented as additive combination, and they are subjected to the same linear processing in the imaging processor before the output complex image is subjected to modulo conversion into a grayscale image, so that the echo signal and the interference signal can be independently processed respectively in the process from the front end of the receiver to the image before output and can be superimposed in any point linearity, that is, the interference signal and the echo signal have signal linear superposition characteristics. Therefore, in the embodiment, the echo signal and the target interference signal are respectively obtained by simulating the simulated baseband signal, and then the echo signal and the target interference signal are subjected to superposition and summation processing to obtain the countermeasure signal; the echo signal and the target interference signal can be superposed without a synthetic aperture radar receiving antenna, so that a confrontation signal is obtained, and the simulation of the confrontation of the synthetic aperture radar is realized. Based on the signal linear superposition characteristic and the time delay series superposition characteristic, the simulation of radio wave space propagation and scene and target echo caused by the flight process with the largest simulation difficulty is realized in a computer, and the problems that the acquisition difficulty of the synthetic aperture radar countermeasure data based on the real object in the prior art is large and the like are solved.

The present embodiment also provides a computer-readable storage medium on which a computer program is stored, which when executed by a processor implements any of the methods in the present embodiments.

In an embodiment, referring to fig. 5, the embodiment further provides an electronic device 500, which includes a memory 501, a processor 502, and a computer program stored on the memory and executable on the processor, and when the processor 502 executes the computer program, the steps of the method according to any one of the above embodiments are implemented.

The computer-readable storage medium in the embodiment can be understood by those skilled in the art as follows: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with a computer program. The aforementioned computer program may be stored in a computer readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.

The electronic device provided by the embodiment comprises a processor, a memory, a transceiver and a communication interface, wherein the memory and the communication interface are connected with the processor and the transceiver and are used for realizing mutual communication, the memory is used for storing a computer program, the communication interface is used for carrying out communication, and the processor and the transceiver are used for operating the computer program to enable the electronic device to execute the steps of the method.

In this embodiment, the Memory may include a Random Access Memory (RAM), and may also include a non-volatile Memory (non-volatile Memory), such as at least one disk Memory.

The Processor may be a general-purpose Processor, and includes a Central Processing Unit (CPU), a Network Processor (NP), and the like; the Integrated Circuit may also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, or discrete hardware components.

In the above-described embodiments, references in the specification to "the present embodiment," "an embodiment," "another embodiment," "in some example embodiments," or "other embodiments" means that a particular feature, structure, or characteristic described in connection with the embodiments is included in at least some embodiments, but not necessarily all embodiments. The various appearances of "the present embodiment," "one embodiment," or "another embodiment" are not necessarily all referring to the same embodiment.

In the embodiments described above, although the present invention has been described in conjunction with specific embodiments thereof, many alternatives, modifications, and variations of these embodiments will be apparent to those skilled in the art in light of the foregoing description. For example, other memory structures (e.g., dynamic ram (dram)) may use the discussed embodiments. The embodiments of the invention are intended to embrace all such alternatives, modifications and variances that fall within the broad scope of the appended claims.

The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.

The invention is operational with numerous general purpose or special purpose computing system environments or configurations. For example: personal computers, server computers, hand-held or portable devices, tablet-type devices, multiprocessor systems, microprocessor-based systems, set top boxes, programmable consumer electronics, network PCs, minicomputers, mainframe computers, distributed computing environments that include any of the above systems or devices, and the like.

The invention may be described in the general context of computer-executable instructions, such as program modules, being executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types. The invention may also be practiced in distributed computing environments where tasks are performed by remote processing devices that are linked through a communications network. In a distributed computing environment, program modules may be located in both local and remote computer storage media including memory storage devices.

The foregoing embodiments are merely illustrative of the principles of the present invention and its efficacy, and are not to be construed as limiting the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims

1. A synthetic aperture radar countermeasure simulation method, comprising:

setting parameters of an interference machine, transmitting the radar transmitting signal to the interference machine, receiving the radar transmitting signal and transmitting an interference signal by the interference machine, and simulating an actual propagation process of the interference signal according to the target scene parameters and the parameters of the interference machine to obtain a target interference signal;

and imaging the confrontation signal to obtain target imaging data.

2. The synthetic aperture radar countermeasure simulation method of claim 1, wherein the simulating generation of the baseband signal and the radar transmission signal from the synthetic aperture radar parameters and the target scene parameters comprises:

simulating and generating a baseband signal according to the synthetic aperture radar signal and the target scene parameter;

3. The synthetic aperture radar countermeasure simulation method of claim 2, wherein the performing a first spatial propagation simulation on the baseband signal according to the target scene parameter to obtain the radar transmission signal comprises:

4. The synthetic aperture radar countermeasure simulation method of claim 1, wherein the simulating an actual generation process of an echo signal according to the baseband signal, the target scene parameter, and the target parameter to be detected, and obtaining the echo signal comprises:

5. The synthetic aperture radar countermeasure simulation method of claim 1, wherein after the imaging processing of the countermeasure signal to obtain target imaging data, the method further comprises:

and imaging the first antagonizing signal to obtain first target imaging data.

6. The method of claim 5, wherein after the imaging the first countering signal to obtain first target imaging data, the method further comprises:

performing feature fusion processing on the first feature and the second feature to obtain a fusion feature;

and acquiring a performance evaluation result of the first target imaging data according to the fusion characteristics.

7. The synthetic aperture radar countermeasure simulation method of claim 5, wherein after the imaging processing of the countermeasure signal to obtain target imaging data, the method further comprises:

adjusting the synthetic aperture radar parameters and the target scene parameters according to the demand data, and simulating to generate a target baseband signal according to the adjusted synthetic aperture radar parameters and the adjusted target scene parameters;

imaging the second antagonizing signal to obtain second target imaging data;

8. A synthetic aperture radar confrontation simulation apparatus, comprising:

the parameter setting module is used for setting parameters of the synthetic aperture radar, parameters of a target scene and parameters of a target to be detected;

the echo signal module is used for simulating the actual generation process of an echo signal according to the baseband signal, the target scene parameter and the target parameter to be detected to obtain an echo signal;

9. An electronic device comprising a processor, a memory, and a communication bus;

the communication bus is used for connecting the processor and the memory;

the processor is configured to execute a computer program stored in the memory to implement the method of any one of claims 1-7.

10. A computer-readable storage medium, characterized in that a computer program is stored thereon for causing the computer to perform the method of any one of claims 1-7.