CN111638493A - SAR imaging seeker interference countermeasure simulation system - Google Patents
SAR imaging seeker interference countermeasure simulation system Download PDFInfo
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- CN111638493A CN111638493A CN202010408137.6A CN202010408137A CN111638493A CN 111638493 A CN111638493 A CN 111638493A CN 202010408137 A CN202010408137 A CN 202010408137A CN 111638493 A CN111638493 A CN 111638493A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/40—Means for monitoring or calibrating
- G01S7/4052—Means for monitoring or calibrating by simulation of echoes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/40—Means for monitoring or calibrating
- G01S7/4052—Means for monitoring or calibrating by simulation of echoes
- G01S7/406—Means for monitoring or calibrating by simulation of echoes using internally generated reference signals, e.g. via delay line, via RF or IF signal injection or via integrated reference reflector or transponder
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
An SAR imaging seeker interference countermeasure simulation system belongs to the technical field of radar detection guidance and comprises: the scene echo generating module is used for completing echo simulation to obtain an intermediate frequency analog simulation signal; the interference signal generation module is used for completing interference simulation to obtain an intermediate frequency analog interference signal; the power synthesis module is used for synthesizing the two signals into one path of intermediate frequency analog signal; the signal acquisition module is used for carrying out signal down-conversion processing on the intermediate-frequency analog signal to obtain a baseband signal; the signal processing module is used for carrying out SAR related processing on the baseband signal to obtain processing information; and the efficiency evaluation module is used for evaluating the interference effect of the preset interference by combining the related setting information and the processing information of the preset interference to obtain interference and anti-interference results. The invention has the beneficial effects that: the SAR imaging seeker interference countermeasure simulation method has the advantages of being capable of conducting interference countermeasure simulation on the SAR imaging seeker at signal intermediate frequency and baseband, achieving the purpose of simulation verification, being strong in function, easy to expand, convenient to test and verify and the like, and is particularly suitable for the field of high-speed aircraft guidance.
Description
Technical Field
The invention relates to the technical field of radar detection guidance, in particular to an SAR imaging seeker interference countermeasure simulation system.
Background
With the development of Radar technology, Synthetic Aperture Radar (SAR) imaging has been applied to more and more fields, and missile-borne SAR has become a hot research spot at present. The missile-borne SAR is very suitable for the application of a seeker of a high-speed aircraft, can overcome the defects that an optical seeker is short in action distance and cannot be used in all weather, and has a good application prospect.
The current seeker faces a complex electromagnetic environment, although the SAR imaging seeker can perform high-resolution imaging and greatly improve the signal-to-noise ratio, when the SAR imaging seeker faces image deception interference, noise convolution interference, frequency shift interference and other interference, false image information appears in an SAR image, and therefore detection of a target by the seeker is affected. In order to evaluate the performance of the SAR imaging seeker under the electromagnetic interference environment, a set of SAR imaging seeker interference countermeasure simulation system is required to be constructed, and the action efficiency of the seeker is vividly simulated in the presence of interference.
A paper published by the national defense science and technology university, wuxianhuang fang et al, "research on synthetic aperture radar interference countermeasure simulation system" (proceedings of system simulation, vol. 20, No. 5, 2008) discloses a simulation system. The simulation system is based on SAR interference countermeasure, can perform functional-level SAR signal reconnaissance simulation, simulates the imaging, detecting and identifying processes of SAR under various clutter interference and interference backgrounds, and can evaluate the result. The simulation system is applied to reconnaissance of ground targets, and has larger difference between an imaging post-processing part of signal processing and a seeker. In addition, the system carries out full-digital simulation based on VC6.0 development environment, is not easy to maintain, cannot truly simulate the generation of analog signals and signal sampling, and cannot form a semi-physical simulation system with modules of physical products for test simulation.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an SAR imaging seeker interference countermeasure simulation system, which can perform interference countermeasure simulation on an SAR imaging seeker at a signal intermediate frequency and a baseband so as to achieve the purpose of simulation verification, has the advantages of strong function, easiness in expansion, convenience in test verification and the like, and is particularly suitable for the field of high-speed aircraft guidance.
The invention provides an SAR imaging seeker interference countermeasure simulation system, which comprises:
the scene echo generating module is used for completing echo simulation of the SAR imaging seeker in a preset imaging scene, obtaining an intermediate frequency analog simulation signal and outputting the intermediate frequency analog simulation signal;
the interference signal generation module is used for completing interference simulation of preset interference in a preset imaging scene to obtain and output an intermediate frequency analog interference signal;
the power synthesis module is connected with the scene echo generation module and the interference signal generation module and is used for receiving the intermediate frequency analog simulation signal and the intermediate frequency analog interference signal, synthesizing the intermediate frequency analog simulation signal and the intermediate frequency analog interference signal into an intermediate frequency analog signal and outputting the intermediate frequency analog signal;
the signal acquisition module is respectively connected with the scene echo generation module, the interference signal generation module and the power synthesis module and is used for receiving the intermediate frequency analog signal, carrying out signal down-conversion processing to obtain a baseband signal and outputting the baseband signal;
the signal processing module is connected with the signal acquisition module and used for receiving the baseband signal and carrying out SAR related processing to obtain processing information;
and the efficiency evaluation module is connected with the signal processing module and used for receiving the processing information and evaluating the interference effect of the preset interference by combining the relevant setting information of the preset interference and the processing information to obtain interference and anti-interference results.
Preferably, after the scene echo generating module performs echo simulation to obtain a digital echo simulation signal, the digital echo simulation signal is subjected to digital-to-analog conversion to obtain the intermediate-frequency analog simulation signal.
Preferably, when the interference signal generation module performs interference simulation, after a digital interference simulation signal is obtained, digital-to-analog conversion is performed on the digital interference simulation signal to obtain the intermediate frequency analog interference signal.
Preferably, the power synthesis module performs time domain-based signal superposition processing on the intermediate-frequency analog signal and the intermediate-frequency analog interference signal to obtain the intermediate-frequency analog signal;
the power synthesis module adopts a power synthesizer.
Preferably, the SAR-related processing includes SAR imaging processing, SAR image matching processing, projectile localization processing, and goniometry processing;
the processing information comprises image information corresponding to SAR imaging processing, matching information corresponding to SAR image matching processing, positioning information corresponding to projectile positioning processing and angle measurement information corresponding to angle measurement processing.
Preferably, the related setting information includes an interference pattern and an interference level.
Preferably, the interference and anti-interference result comprises an interference result and an anti-interference result;
the interference result comprises the strength of preset interference obtained by processing according to the relevant set information;
and the anti-interference result comprises an anti-interference effect of the SAR imaging seeker on preset interference in a preset imaging scene according to the processing information.
Preferably, the scene echo generating module and the interference signal generating module send an acquisition instruction to the signal acquisition module;
the scene echo generating module completes echo simulation of a preset imaging scene after sending the acquisition instruction to obtain the intermediate frequency analog simulation signal and outputs the intermediate frequency analog simulation signal;
the interference signal generation module completes interference simulation of preset interference in a preset imaging scene after sending the acquisition instruction to obtain the intermediate frequency analog interference signal and outputs the intermediate frequency analog interference signal;
and the signal acquisition module continuously acquires the intermediate frequency analog simulation signal and the intermediate frequency analog interference signal output by the scene echo generation module and the interference signal generation module after receiving the acquisition instruction.
Preferably, the SAR imaging seeker interference rejection simulation system further includes:
and the display control module is connected with the scene echo generation module, the interference signal generation module, the signal acquisition module, the signal processing module and the efficiency evaluation module and is used for displaying functions, setting parameters, controlling simulation operation and storing data of all modules in the SAR imaging seeker interference countermeasure simulation system.
Preferably, the SAR imaging seeker interference countermeasure simulation system is based on an NI PXIe hardware platform, LabVIEW software and Matlab software to build a simulation system;
the scene echo generating module, the interference signal generating module and the signal acquisition module are all realized by hardware board cards of NI PXIe standard interfaces.
The invention has the beneficial effects that: aiming at the high fidelity requirement of SAR imaging seeker interference countermeasure simulation, the invention carries out signal simulation based on intermediate frequency analog signals and baseband signals, and realizes the real simulation of a signal level processing process.
Different from the traditional Matlab or PC software simulation, the simulation system of the invention can simulate the functions of a radio frequency front-end module, a signal acquisition module and a signal processing module in the SAR imaging seeker, and can simulate an echo scene and an interference scene.
Aiming at the requirement of interference countermeasure simulation verification of the SAR imaging seeker, the simulation system is built based on an NI PXIe hardware platform, LabVIEW software and Matlab software, the scene echo generation module, the interference signal generation module and the signal acquisition module are respectively realized by hardware board cards of NI PXIe standard interfaces, the hardware board cards have the advantages of universality and convenience in plugging and unplugging, meanwhile, the software function has the advantage of easiness in expansion, and the advantages of the hardware and the software are very suitable for building the simulation system and expanding and upgrading and maintaining the functions of a later-stage system.
Drawings
Fig. 1 is a functional block diagram of an interference rejection simulation system for an SAR imaging seeker according to a preferred embodiment of the present invention.
Fig. 2 is a schematic diagram of the connection between the echo generating module and the signal acquiring module in the preferred embodiment of the present invention.
Fig. 3 is a schematic diagram of data interaction between the signal acquisition module and the signal processing module in the preferred embodiment of the present invention.
Reference numbers in the figures:
1-a scene echo generating module; 2-an interference signal generating module; 3-a power synthesis module; 4-a signal acquisition module; 5-a signal processing module; 6-efficiency evaluation module; and 7, displaying and controlling the module.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Referring to fig. 1, an SAR imaging seeker interference countermeasure simulation system includes a scene echo generation module, an interference signal generation module, a power synthesis module, a signal acquisition module, a signal processing module, and an efficiency evaluation module, where the power synthesis module includes the scene echo generation module and the interference signal generation module, the signal acquisition module is respectively connected to the scene echo generation module, the interference signal generation module, and the power synthesis module, the signal processing module is connected to the signal acquisition module, and the efficiency evaluation module is connected to the signal processing module.
The SAR imaging seeker comprises a scene echo generation module, an interference signal generation module, a power synthesis module, a signal acquisition module, a signal processing module and an efficiency evaluation module, wherein the scene echo generation module completes echo simulation of an SAR imaging seeker in a preset imaging scene to obtain an intermediate-frequency analog simulation signal, the interference signal generation module completes interference simulation of preset interference in the preset imaging scene to obtain an intermediate-frequency analog interference signal, the power synthesis module synthesizes the intermediate-frequency analog simulation signal and the intermediate-frequency analog interference signal into one path of intermediate-frequency analog signal, the signal acquisition module performs down-conversion processing on the intermediate-frequency analog signal to obtain a baseband signal, the signal processing module performs SAR related processing on the baseband signal to obtain processing information, the efficiency evaluation module evaluates the interference effect of the preset interference by combining the preset interference related setting information and the processing.
Aiming at the high fidelity requirement of SAR imaging seeker interference countermeasure simulation, the invention carries out signal simulation based on intermediate frequency analog signals and baseband signals, realizes real simulation of signal level processing process, has stronger simulation function, and effectively solves the problem that SAR signal reconnaissance simulation only at functional level in the prior art.
Different from the traditional Matlab or PC software simulation, the simulation system of the invention can simulate the functions of a radio frequency front-end module, a signal acquisition module and a signal processing module in the SAR imaging seeker, and can simulate an echo scene and an interference scene, the imaging post-processing part of signal processing is more similar to the seeker, and the problem that the imaging post-processing part of signal processing is greatly different from the seeker in the prior art is effectively solved.
In a preferred embodiment, after the scene echo generation module performs echo simulation to obtain a digital echo simulation signal, the digital echo simulation signal is subjected to digital-to-analog conversion to obtain the intermediate-frequency analog simulation signal.
And when the interference signal generation module carries out interference simulation, after a digital interference simulation signal is obtained, carrying out digital-to-analog conversion on the digital interference simulation signal to obtain the intermediate frequency analog interference signal.
And the power synthesis module performs time domain-based signal superposition processing on the intermediate-frequency analog simulation signal and the intermediate-frequency analog interference signal to obtain the intermediate-frequency analog signal. The power synthesis module adopts a power synthesizer. The power synthesis module synthesizes the intermediate-frequency analog simulation signal and the intermediate-frequency analog interference signal into one path of intermediate-frequency analog signal and outputs the synthesized signal to be superposed with a time domain signal, and the specific implementation mode is that two radio frequency signal lines are synthesized onto one path of radio frequency signal line through one physical port (two input ends and one output end).
In a preferred embodiment, the SAR-related processing comprises SAR imaging processing, SAR image matching processing, projectile positioning processing, and goniometry processing;
the processing information comprises image information corresponding to SAR imaging processing, matching information corresponding to SAR image matching processing, positioning information corresponding to projectile positioning processing and angle measurement information corresponding to angle measurement processing. The image information refers to an SAR image, the matching information refers to the matching result, namely the position of a matching point, the positioning information refers to the target position and the position of a platform where the seeker is located, and the angle measurement information refers to the measured target angle.
The SAR image is obtained by imaging and processing the acquired echo signals through a signal processing system, wherein the echo signals can adopt baseband signals and intermediate frequency signals, and whether the echo signals adopt the baseband signals or the intermediate frequency signals is determined according to a specific use mode. After the SAR image is obtained, the SAR image is matched with a target template stored in the SAR imaging seeker in advance, and the position (the position of the matched point) of the target in the SAR image is found out. After the matched position of the target is found, two using methods are available, one is to calculate the angle (target angle) of the target relative to the SAR imaging seeker according to the information of the position, the posture and the like of the SAR imaging seeker so as to complete the seeker searching task. The second is to solve the position (positioning information) of the platform where the SAR imaging seeker is located according to the actual position of the target and distance information provided by the SAR image, so as to realize the accurate positioning of the position of the seeker.
In a preferred embodiment, the setting information related to the predetermined interference includes an interference pattern and an interference level of the predetermined interference.
In a preferred embodiment, the interference and interference rejection results include an interference result and an interference rejection result. And the interference result comprises the strength of preset interference obtained by processing according to the relevant set information. And the anti-interference result comprises an anti-interference effect of the SAR imaging seeker on preset interference in a preset imaging scene according to the processing information.
The evaluation of the effectiveness of interference countermeasure is divided into the evaluation of interference and the evaluation of interference resistance. And evaluating the interference according to the interference pattern and the interference grade to obtain the strength of the interference. The anti-interference evaluation basis is the image information, the matching information, the positioning information and the angle measurement information, and the anti-interference effect is obtained comprehensively according to the information.
In a preferred embodiment, the scene echo generating module and the interference signal generating module send an acquisition instruction to the signal acquisition module.
And the scene echo generating module completes echo simulation of a preset imaging scene after sending the acquisition instruction to obtain the intermediate frequency analog simulation signal and outputs the intermediate frequency analog simulation signal.
And the interference signal generation module finishes the interference simulation of preset interference in a preset imaging scene after sending the acquisition instruction to obtain the intermediate frequency analog interference signal and outputs the intermediate frequency analog interference signal.
And the signal acquisition module continuously acquires the intermediate frequency analog simulation signal and the intermediate frequency analog interference signal output by the scene echo generation module and the interference signal generation module after receiving the acquisition instruction.
In a preferred embodiment, the SAR imaging seeker interference rejection simulation system further includes:
and the display control module is connected with the scene echo generation module, the interference signal generation module, the signal acquisition module, the signal processing module and the efficiency evaluation module, is upper computer software of the simulation system, and is used for displaying functions, setting parameters, controlling simulation operation and storing data of all modules in the SAR imaging seeker interference countermeasure simulation system, and finishing functions of interface display, parameter setting, control of simulation operation, data storage and the like of the simulation software.
The display control module comprises functions of a main interface, a sub-interface, parameter setting, simulation operation control, data storage and the like. The main interface function is an upper computer simulation main interface and displays the whole seeker signal processing process, the imaging result, the key parameter index and the evaluation result. The sub-interface function is a display interface entered by a button or a menu in the main interface, and the sub-interface displays information such as parameter setting, signal processing flow, key data and the like of the guide head sub-function module. The parameter setting function sets and manages parameters required by the simulation system, and the parameters comprise: radar parameters, scene parameters, interference parameters, seeker motion trajectory, and the like. The simulation operation control function responds to operation instructions of suspension, continuation, stop and the like of the simulation operation process of a user through a human-computer interface in real time, and the simulation operation control relates to operations of starting, suspending, stopping and the like of simulation. The data storage function completes storage of key data such as echo data, system parameters, SAR images, matching information, positioning information, angle measurement information and the like in the simulation operation process.
In a preferred embodiment, the SAR imaging seeker interference rejection simulation system is constructed based on an NI PXIe hardware platform, LabVIEW software and Matlab software.
The scene echo generating module, the interference signal generating module and the signal acquisition module are all realized by hardware board cards of NI PXIe standard interfaces.
In a specific embodiment, referring to fig. 2-3, the scene echo generation module is composed of an NI PXIe-7976FlexRIO FPGA hardware board and an AT1120 adapter hardware board, the two are used in cooperation to output a single-channel analog signal with a bit width of 14 bits and a DA sampling rate as high as 2GS/s, the scene echo generation module is connected to the power combiner through a signal output line, and a trigger signal output line is connected to the signal acquisition module. The scene echo generating module generates a digital intermediate frequency scene echo (namely, a digital echo simulation signal) in a digital domain, and then converts the digital intermediate frequency scene echo into an intermediate frequency analog signal (namely, an intermediate frequency analog simulation signal) through a DAC (digital to analog converter), and an output interface is AO 0 +.
The interference signal generation module is composed of an NI PXIe-7976FlexRIO FPGA hardware board card and an AT1120 adapter hardware board card, the NI PXIe-7976FlexRIO FPGA hardware board card and the AT1120 adapter hardware board card are matched to use a single-channel analog signal which can output a 14-bit wide signal and has a DA sampling rate as high as 2GS/s, and the interference signal generation module is connected with the power synthesizer through a signal output line. The interference signal generation module generates a digital intermediate frequency interference signal (i.e., a digital interference simulation signal) in a digital domain, and converts the digital intermediate frequency interference signal (i.e., a digital interference simulation signal) into an intermediate frequency analog interference signal (i.e., an intermediate frequency analog interference signal) through the DAC, and an output interface is AO 0 +.
The power synthesizer synthesizes the analog output AO 0+ of the scene echo generating module and the analog output AO 0+ of the interference signal generating module into a signal (namely, an intermediate frequency analog signal) and is connected to an AI 0 interface of the signal acquisition module.
The trigger signal of the scene echo generating module is output by an interface TRIG OUT, and the trigger signal is input to a DIO interface of the signal acquisition module and used for acquiring a signal AI 0, and the rising edge is effective.
The signal acquisition module is composed of NI PXIe-5764 hardware board cards, the sampling bit width is 16 bits during acquisition, the highest sampling rate is up to 1GS/s, and the signal acquisition module is connected with the power synthesizer through an input signal line. After the signal acquisition module acquires the intermediate frequency analog signal, the signal is subjected to down-conversion processing, the signal is converted from a digital intermediate frequency to a digital baseband to generate a complex signal with orthogonal baseband, I is a real part of the baseband signal, Q is an imaginary part of the baseband signal, and the digital I/Q signal is transmitted to the signal processing module through driving.
The signal processing module is realized by LabVIEW software and Matlab software together, receives the baseband signal transmitted by the signal acquisition module and transmits processing information to the efficiency evaluation module. After the SAR imaging processing, SAR image matching and the like of the baseband signal are finished by the signal processing module, SAR image information obtained by the SAR imaging processing and matching information obtained by the SAR image matching are transmitted to the efficiency evaluation module, and positioning information obtained by positioning and resolving the seeker and target angle measurement information are transmitted to the efficiency evaluation module.
The display control module is designed and developed by using an NI LabVIEW software development environment and can run under the current mainstream Windows operating systems such as Win7/Win8/Win10 and the like.
The simulation system uses an industry standard NI PXIe hardware platform, and the hardware platform comprises a PXIe-1085 chassis and a PXIe-8880 controller. The hardware platform comprises a PXIe-1085 case and a PXIe-8880 controller, wherein the PXIe-8880 controller is equivalent to a computer host and is used for completing the functions of running a display control module, LabVIEW software and Matlab software.
The simulation process of the embodiment of the invention is as follows:
and (4) connecting the system. The method comprises the steps of inserting a board NIPXIe-7976 of an NI PXIe interface of a scene echo generation module into a PCIE slot of an NI chassis, and then connecting an AT1120 adapter hardware board to a port of the NI PXIe-7976. The NI PXIe-7976 of the NI PXIe interface of the interference signal generation module is inserted into a PCIE slot of an NI chassis, and then the AT1120 adapter hardware board is connected to a port of the NI PXIe-7976. The NI PXIe-5764 board card of the signal acquisition module is inserted into a PCIE slot of the NI case, and the two ATs 1120, the power synthesizer and the NI PXIe-5764 are connected by using the SMA cable
And supplying power to the system. And (3) supplying power to the SAR imaging seeker interference countermeasure simulation system through 220V/50Hz mains supply, and simultaneously opening SAR imaging seeker interference countermeasure simulation system software.
And setting parameters. System parameters are set on a main interface of simulation software, and parameters and inputs required by each module are set on sub-interfaces of each functional module of the SAR imaging seeker interference countermeasure simulation system.
The simulation is started. After the parameter setting is finished, simulation is started, simulation can be suspended in the simulation running process, simulation can be continued after suspension, and simulation can also be stopped in the simulation running process.
And (5) analyzing a simulation result. And after the simulation is finished, evaluating the efficiency of interference countermeasure.
In summary, aiming at the requirement of interference countermeasure simulation verification of the SAR imaging seeker, the simulation system is built based on an NI PXIe hardware platform, LabVIEW software and Matlab software, the scene echo generation module, the interference signal generation module and the signal acquisition module are respectively realized by hardware board cards of NI PXIe standard interfaces, the hardware board cards have the advantages of universality and convenience in plugging and unplugging, meanwhile, the software function has the advantage of easiness in expansion, and the advantages of the hardware and the software are very suitable for building the simulation system and expanding and upgrading maintenance of a later-stage system.
The present invention is not limited to the above-described embodiments, and it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and such modifications and improvements are also considered to be within the scope of the present invention. Those not described in detail in this specification are within the skill of the art.
Claims (10)
1. An SAR imaging seeker interference rejection simulation system, comprising:
the scene echo generating module is used for completing echo simulation of the SAR imaging seeker in a preset imaging scene, obtaining an intermediate frequency analog simulation signal and outputting the intermediate frequency analog simulation signal;
the interference signal generation module is used for completing interference simulation of preset interference in a preset imaging scene to obtain and output an intermediate frequency analog interference signal;
the power synthesis module is connected with the scene echo generation module and the interference signal generation module and is used for receiving the intermediate frequency analog simulation signal and the intermediate frequency analog interference signal, synthesizing the intermediate frequency analog simulation signal and the intermediate frequency analog interference signal into an intermediate frequency analog signal and outputting the intermediate frequency analog signal;
the signal acquisition module is respectively connected with the scene echo generation module, the interference signal generation module and the power synthesis module and is used for receiving the intermediate frequency analog signal, carrying out signal down-conversion processing to obtain a baseband signal and outputting the baseband signal;
the signal processing module is connected with the signal acquisition module and used for receiving the baseband signal and carrying out SAR related processing to obtain processing information;
and the efficiency evaluation module is connected with the signal processing module and used for receiving the processing information and evaluating the interference effect of the preset interference by combining the relevant setting information of the preset interference and the processing information to obtain interference and anti-interference results.
2. The SAR imaging seeker interference rejection simulation system of claim 1, wherein the scene echo generation module performs echo simulation to obtain a digital echo simulation signal, and then performs digital-to-analog conversion on the digital echo simulation signal to obtain the intermediate frequency analog simulation signal.
3. The SAR imaging seeker interference rejection simulation system of claim 1, wherein the interference signal generation module performs interference simulation, obtains a digital interference simulation signal, and performs digital-to-analog conversion on the digital interference simulation signal to obtain the intermediate frequency analog interference signal.
4. The SAR imaging seeker interference rejection simulation system of claim 1, wherein the power synthesis module performs time-domain based signal superposition processing on the intermediate frequency analog simulation signal and the intermediate frequency analog interference signal to obtain the intermediate frequency analog signal;
the power synthesis module adopts a power synthesizer.
5. The SAR imaging seeker interference rejection simulation system of claim 1, wherein the SAR-related processing comprises SAR imaging processing, SAR image matching processing, projectile localization processing, and goniometry processing;
the processing information comprises image information corresponding to SAR imaging processing, matching information corresponding to SAR image matching processing, positioning information corresponding to projectile positioning processing and angle measurement information corresponding to angle measurement processing.
6. The SAR imaging seeker interference rejection simulation system of claim 1, wherein the relevant set information comprises an interference pattern and an interference level.
7. The SAR imaging seeker interference rejection simulation system of claim 1, wherein the interference and interference rejection results comprise an interference result and an interference rejection result;
the interference result comprises the strength of preset interference obtained by processing according to the relevant set information;
and the anti-interference result comprises an anti-interference effect of the SAR imaging seeker on preset interference in a preset imaging scene according to the processing information.
8. The SAR imaging seeker interference rejection simulation system of claim 1, wherein the scene echo generation module and the interference signal generation module send acquisition instructions to the signal acquisition module;
the scene echo generating module completes echo simulation of a preset imaging scene after sending the acquisition instruction to obtain the intermediate frequency analog simulation signal and outputs the intermediate frequency analog simulation signal;
the interference signal generation module completes interference simulation of preset interference in a preset imaging scene after sending the acquisition instruction to obtain the intermediate frequency analog interference signal and outputs the intermediate frequency analog interference signal;
and the signal acquisition module continuously acquires the intermediate frequency analog simulation signal and the intermediate frequency analog interference signal output by the scene echo generation module and the interference signal generation module after receiving the acquisition instruction.
9. The SAR imaging seeker interference rejection simulation system of claim 1, wherein the SAR imaging seeker interference rejection simulation system further comprises:
and the display control module is connected with the scene echo generation module, the interference signal generation module, the signal acquisition module, the signal processing module and the efficiency evaluation module and is used for displaying functions, setting parameters, controlling simulation operation and storing data of all modules in the SAR imaging seeker interference countermeasure simulation system.
10. The SAR imaging seeker interference rejection simulation system of claim 9, wherein the SAR imaging seeker interference rejection simulation system builds a simulation system based on an NI PXIe hardware platform, LabVIEW software, and Matlab software;
the scene echo generating module, the interference signal generating module and the signal acquisition module are all realized by hardware board cards of NIPXIe standard interfaces.
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Cited By (3)
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