CN114371452A - Interference method and interference device for synthetic aperture radar motion compensation - Google Patents
Interference method and interference device for synthetic aperture radar motion compensation Download PDFInfo
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- CN114371452A CN114371452A CN202210277802.1A CN202210277802A CN114371452A CN 114371452 A CN114371452 A CN 114371452A CN 202210277802 A CN202210277802 A CN 202210277802A CN 114371452 A CN114371452 A CN 114371452A
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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
- G01S7/38—Jamming means, e.g. producing false echoes
Abstract
The application discloses an interference method and an interference device for synthetic aperture radar motion compensation. The interference method comprises the following steps: receiving a radar signal, and analyzing to obtain radar parameters of the target synthetic aperture radar; according to the radar parameters, calculating a theoretical value of the target synthetic aperture radar when the motion compensation parameters are extracted aiming at a protection target area; generating an interference signal according to a preset interference mode, the radar parameter and the theoretical value; and transmitting the interference signal to the target synthetic aperture radar within the scanning time of the target synthetic aperture radar, and interfering the motion compensation process in the imaging processing of the synthetic aperture radar so as to realize high-efficiency interference on the synthetic aperture radar.
Description
Technical Field
The application relates to the technical field of radar countermeasure, in particular to an interference method and an interference device for synthetic aperture radar motion compensation.
Background
Synthetic Aperture Radar (SAR) is an advanced earth observation sensor, and can form a high-resolution two-dimensional image on a ground fixed target, so that the purposes of classifying, identifying and positioning the ground target and striking the ground target according to the high-resolution two-dimensional image can be achieved through accurate positioning. In the satellite-borne/airborne/missile-borne SAR, the premise for imaging a static target or a moving target on the ground is that the accurate inversion of the relative motion relation between a radar and the target is carried out in a data recording period required by imaging, and the inversion accuracy is directly related to whether the SAR can be imaged correctly or not and influences core performance indexes such as the resolution ratio of an image, sidelobe suppression and the like. With the general improvement of SAR imaging resolution, the requirement on inversion accuracy is higher and higher. In the SAR imaging process, the process of inverting and compensating motion parameters is collectively referred to as motion compensation. For SAR reconnaissance threats, interference by transmitting electromagnetic signals is an effective way to combat the threat.
In the process of realizing the prior art, the inventor finds that:
the interference result is not further analyzed by the existing interference method, the interference mode is simple, and the anti-interference difficulty of the radar is reduced. For the method of imaging by the synthetic aperture radar through motion compensation, the current interference technology is not analyzed correspondingly, and the interference technology specially aiming at the motion compensation function is not concerned and proposed.
Therefore, it is necessary to provide a related technical solution that interference to SAR can be realized by destroying motion compensation, and parameter extraction is not accurate, imaging is not clear, or parameter extraction fails and imaging cannot be performed.
Disclosure of Invention
The embodiment of the application provides a related technical scheme which can realize the interference on the SAR by destroying the motion compensation, so that the parameter extraction is not accurate, the imaging is not clear or the parameter extraction fails and the imaging cannot be realized, and the technical problem of simple interference mode in the existing interference method is solved.
The application provides an interference method for synthetic aperture radar motion compensation, which comprises the following specific steps:
receiving a radar signal, and analyzing to obtain radar parameters of the target synthetic aperture radar;
according to the radar parameters, calculating a theoretical value of the target synthetic aperture radar when the motion compensation parameters are extracted aiming at a protection target area;
generating an interference signal according to a preset interference mode, the radar parameter and the theoretical value;
transmitting the interference signal to the target synthetic aperture radar within a scan time of the target synthetic aperture radar.
Further, the carrying platform of the target synthetic aperture radar operates in the atmosphere.
Further, generating an interference signal according to a preset interference mode, the radar parameter and the theoretical value, comprising the following specific steps:
establishing a correlation model according to a preset interference mode, the radar parameter and the theoretical value;
calculating an interference signal parameter interfering the theoretical value according to the correlation model;
and generating an interference signal according to the interference signal parameter.
Further, the preset interference mode is interference affecting clutter centers.
Further, the preset interference mode is multi-strong point target interference.
Further, the scanning time is the scanning time of the main lobe of the target synthetic aperture radar.
The application also provides an interference device for compensating the motion of the synthetic aperture radar, which comprises:
the receiving module is used for receiving the radar signal and analyzing to obtain the radar parameter of the target synthetic aperture radar;
the processing module is used for calculating a theoretical value of the target synthetic aperture radar when the motion compensation parameters are extracted aiming at a protection target area according to the radar parameters;
the generating module is used for generating an interference signal according to a preset interference mode, the radar parameter and the theoretical value;
a transmitting module, configured to transmit the interference signal to the target synthetic aperture radar within a scanning time of the target synthetic aperture radar.
Further, the carrying platform of the target synthetic aperture radar operates in the atmosphere.
Further, the generating module is specifically configured to:
establishing a correlation model according to a preset interference mode, the radar parameter and the theoretical value;
calculating an interference signal parameter interfering the theoretical value according to the correlation model;
and generating an interference signal according to the interference signal parameter.
Further, the preset interference mode is interference affecting clutter centers.
The embodiment provided by the application has at least the following beneficial effects:
the method for adding the interference signal into the echo signal returned by the protection target damages the process of extracting parameters when the synthetic aperture radar performs motion compensation, realizes the interference to the synthetic aperture radar, especially the synthetic aperture radar motion compensation process of an airborne/missile-borne platform, and then the purpose of accurately positioning the protection target by the interference target synthetic aperture radar is achieved, and the anti-interference difficulty of the synthetic aperture radar to the interference is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a flowchart of an interference method for synthetic aperture radar motion compensation according to an embodiment of the present disclosure;
fig. 2 is a flowchart illustrating an interference signal generation method in an interference method for synthetic aperture radar motion compensation according to an embodiment of the present disclosure;
fig. 3 is a scout image of a synthetic aperture radar provided in an embodiment of the present application without interference;
fig. 4 is a scout image of the synthetic aperture radar provided by the embodiment of the present application when interfered by a low-intensity interference signal;
fig. 5 is a scout image of the synthetic aperture radar provided by the embodiment of the present application when interfered by a high-intensity interference signal;
fig. 6 is a schematic diagram of an interference apparatus for compensating motion of a synthetic aperture radar according to an embodiment of the present disclosure.
100 interference device for synthetic aperture radar motion compensation
11 receiving module
12 processing module
13 generating module
14 a transmitting module.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The synthetic aperture radar is carried on an aerial and 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 perform long-distance high-resolution ground imaging reconnaissance all day long and all weather, and obtains ground target information.
Referring to fig. 1, the method for interfering with the motion compensation of synthetic aperture radar provided in the present application includes the following specific steps:
s100: and receiving the radar signal, and analyzing to obtain the radar parameters of the target synthetic aperture radar.
It will be appreciated that synthetic aperture radar will emit a scout signal outwardly when it is scouting a target. The reconnaissance signal can be understood as an electromagnetic wave emitted when the radar reconnaissance the target, and has certain radar parameters such as frequency, bandwidth, pulse width, amplitude, phase and the like. The radar parameters include conventional parameters and intra-pulse characteristic parameters. By receiving various radar signals in the environment and screening through the characteristic parameter characteristics of the synthetic aperture radar, the reconnaissance signal of the target synthetic aperture radar can be obtained. And analyzing the received reconnaissance signal of the synthetic aperture radar to obtain the radar parameters of the target synthetic aperture radar. The radar parameters obtained by analyzing the reconnaissance signals of the target synthetic aperture radar are important basic data when interference work is carried out. It is noted that synthetic aperture radar herein includes any synthetic aperture radar that involves extracting motion information in target echoes for imaging. The operation modes of the synthetic aperture radar here include scanning, strip, beam, sliding beam, and the like.
Further, the carrying platform of the target synthetic aperture radar operates in the atmosphere.
It should be noted that, according to differences of the operation space, size, weight, and motion characteristics of the synthetic aperture radar mounting platform, the emphasis point and the method of motion compensation are greatly different. The motion compensation can be roughly divided into two types, one is to accurately measure the motion state of the platform by using measuring equipment such as inertial guidance INS and satellite navigation GPS (global positioning system) Beidou carried by the platform, and the other is to extract parameters by extracting motion information contained in target echoes. The satellite-borne platform can meet the motion compensation requirement only by using motion/attitude measurement data, and the airborne/missile-borne platform cannot meet the motion compensation requirement only by using platform measurement data due to the influence of factors such as airflow and the like, and imaging parameters need to be extracted from echo data. Preferably, the operation space of the platform carrying the target synthetic aperture radar is in the atmosphere, that is, the platform carrying the target synthetic aperture radar operates in the atmosphere. For example: the synthetic aperture radar here may be an airborne or missile-borne synthetic aperture radar. Obviously, limiting the platform on which the target synthetic aperture radar is mounted to the platform operating in the atmosphere helps to specifically interfere with the motion compensation process of the synthetic aperture radar, thereby improving interference efficiency.
S200: and calculating a theoretical value of the target synthetic aperture radar when the motion compensation parameters are extracted aiming at the protection target area according to the radar parameters.
It is obvious that the protected target area here may be an area consisting of fixed position protected targets, such as houses, bridges, dams, etc. The protection target area may also be an area formed by protection targets with constantly changing positions, such as a running train, a moving armored car, a sailing warship and the like. For different protection target areas, the synthetic aperture radar has different data presentation forms, and the final scout data of the synthetic aperture radar also differs. Obviously, the scout data here contain various reflection parameters of the protected target. When the target synthetic aperture radar performs motion compensation, parameters need to be extracted from the echo signals. The echo signal is an electromagnetic wave reflected by the target synthetic aperture radar when the target area is detected. Here the reflection parameters and the reflected electromagnetic waves may directly influence the final imaging of the target synthetic aperture radar. The reconnaissance may be actual reconnaissance of the target synthetic aperture radar on the protection target area, or simulated reconnaissance of the target synthetic aperture radar on the protection target area, which is performed through computer foreplay. When reconnaissance threats of the synthetic aperture radar are responded, various data supports are needed for formulating corresponding protection strategies. In order to interfere the motion compensation process of the synthetic aperture radar in a targeted manner, corresponding simulation analysis can be carried out through radar parameters to deal with the condition that the target is exposed due to the fact that a protection target area is clearly imaged by the synthetic aperture radar, and a corresponding interference scheme is formulated. It is noted that synthetic aperture radars operating in the atmosphere acquire motion compensation parameters required for imaging from echoes of targets and terrain by processing them. Obviously, the interferer needs to simulate the actual motion information parameter extraction process according to the radar parameters of the synthetic aperture radar in order to obtain the motion compensation parameters, so as to finally calculate the theoretical value of the target synthetic aperture radar when extracting the motion compensation parameters for the target area.
S300: and generating an interference signal according to a preset interference mode, the radar parameter and the theoretical value.
It is understood that in order to achieve accurate interference, various influencing factors need to be considered when generating the interference signal. By analyzing the process of influencing the synthetic aperture radar to carry out motion compensation, the interference mode of the interference equipment, the radar parameters of the target synthetic aperture radar and the theoretical value of the target synthetic aperture radar when the motion compensation parameters are extracted aiming at the protection target area can be directly related to the generation of the interference signal. The purpose of influencing or destroying the extraction of the motion compensation parameters is achieved by radiating interference signals, wherein the interference signals comprise but are not limited to noise interference, answer-type interference, forwarding interference and deception interference. The interference method is directed to the extraction of motion compensation parameters in the imaging process of the synthetic aperture radar, including but not limited to doppler center frequency, doppler modulation frequency, motion parameters of a moving object, and the like. The interference method is mainly directed at the parameter extraction process commonly applied in the airborne/missile-borne synthetic aperture radar, and is also applicable to other platform synthetic aperture radars related to the parameter extraction process. The interference method is mainly directed at the main working lobe of the synthetic aperture radar, and is also suitable for the interference mode entering from the side lobe.
Further, referring to fig. 2, generating an interference signal according to a preset interference pattern, the radar parameter, and the theoretical value includes the following specific steps:
s301: establishing a correlation model according to a preset interference mode, the radar parameter and the theoretical value;
s302: calculating an interference signal parameter interfering the theoretical value according to the correlation model;
s303: and generating an interference signal according to the interference signal parameter.
It should be noted that the association model may be a mathematical model or a neural network model based on artificial intelligence. By establishing the correlation model, the interference signal parameters for generating the interference signal can be quickly confirmed through the known interference mode, radar parameters and theoretical values when the motion compensation parameters are extracted. The interference signal parameter is directly related to a theoretical value when the motion compensation parameter is extracted, and can be directly used for generating an interference signal, so that the generation of the theoretical value is influenced, and finally, the process of motion compensation of the high-efficiency interference target synthetic aperture radar is achieved. The interference signal parameter is understood to be a parameter, such as frequency, bandwidth, pulse width, amplitude, phase, etc., that needs to be set when the interfering device transmits the interference signal.
Specifically, the preset interference mode is interference affecting a clutter center.
It will be appreciated that there are many interference patterns for the interference of synthetic aperture radar. In order to interfere with the motion compensation process of the synthetic aperture radar by the clutter locking method, interference affecting the clutter center may be used. In a specific application scenario, the preset interference pattern may be noise interference. When the target synthetic aperture radar carries out motion compensation operation through clutter locking, the Doppler center frequency is extracted through the center locking of the clutter peak of the surface target. In order to interfere the motion compensation operation of clutter locking, an interference affecting the clutter center, such as noise interference, may be added, shifting the clutter spectrum or causing multiple spectral peaks to appear, resulting in reduced accuracy of the doppler center frequency or inability to measure the doppler center frequency.
Further, the preset interference mode is multi-strong point target interference.
It is noted that synthetic aperture radars may be motion compensated by means of self-focusing. In order to interfere the motion compensation process of the synthetic aperture radar by the self-focusing mode, multi-strong point target interference can be added. In a specific application scenario, the preset interference pattern may be a point target replication forwarding interference. When the target synthetic aperture radar carries out motion compensation operation through self-focusing, the Doppler frequency modulation is extracted through point target self-focusing. In order to interfere the self-focusing motion compensation operation, a plurality of strong point target interferences such as point target replication forwarding interferences can be added, so that a large number of strong point targets inconsistent with real target parameters are presented in the synthetic aperture radar reconnaissance data, and the self-focusing is failed.
S400: transmitting the interference signal to the target synthetic aperture radar within a scan time of the target synthetic aperture radar.
It will be appreciated that there will be a scan time for the synthetic aperture radar to perform a reconnaissance. The scan time is a critical time period for acquiring target information. Therefore, in order to improve the interference efficiency, the corresponding interference operation can be performed within the scanning time of the target synthetic aperture radar. In a specific implementation mode, the interference equipment is deployed in a target area needing interference protection in advance, when an enemy airborne/missile-borne synthetic aperture radar reconnaissance-strike irradiates the target area, an interference signal is transmitted to the enemy airborne/missile-borne synthetic aperture radar, the interference signal and a radar echo of the target area enter a synthetic aperture radar receiver together, the extraction of motion compensation parameters of the enemy airborne/missile-borne synthetic aperture radar is influenced or destroyed in the imaging process, imaging is unclear or cannot be carried out, and the enemy is prevented from obtaining target information and protecting the target from being struck. Radar echo is understood here to mean an echo signal. The scanning time can be derived by radar parameters. Referring to fig. 3, in the absence of interference, the target synthetic aperture radar extracts correct parameters for motion compensation, and forms a clear image of the target area. In a specific application scenario, when the target synthetic aperture radar detects a target in an interference environment, a superposed signal of a protection target, a ground object echo and an interference signal is received. At this time, when the target synthetic aperture radar extracts the motion compensation parameter from the superimposed signal, the motion compensation parameter extraction process will be affected due to the addition of the interference signal. Referring to fig. 4, when there is low-intensity interference and the energy of the interference signal is not large, the motion compensation parameter extracted by the target synthetic aperture radar only has a large error, which finally results in a decrease in the motion compensation precision of the synthetic aperture radar. Because the parameters extracted by the synthetic aperture radar are inaccurate, accurate motion compensation cannot be carried out, and a target area becomes a blurred and defocused image. Referring to fig. 5, when there is high-intensity interference and the interference signal energy is sufficient, the target synthetic aperture radar fails to extract the motion compensation parameters, and cannot extract the parameters, so that the target synthetic aperture radar cannot complete motion compensation, and finally cannot image the target area.
Specifically, the scanning time is the scanning time of the main lobe of the target synthetic aperture radar.
It is noted that the main lobe is the largest radiation beam located on the antenna pattern, which usually has two or more lobes, where the lobe with the largest radiation intensity is called the main lobe. By limiting the scan time to the scan time of the main lobe of the target synthetic aperture radar, the effectiveness of dealing with the synthetic aperture radar's reconnaissance threat may be improved.
Referring to fig. 6, the present application further provides an interference apparatus 100 for compensating for a motion of a synthetic aperture radar, including:
the receiving module 11 is configured to receive a radar signal and analyze the radar signal to obtain a radar parameter of the target synthetic aperture radar;
the processing module 12 is configured to calculate a theoretical value of the target synthetic aperture radar when extracting a motion compensation parameter for a protection target area according to the radar parameter;
a generating module 13, configured to generate an interference signal according to a preset interference pattern, the radar parameter, and the theoretical value;
a transmitting module 14, configured to transmit the interference signal to the target synthetic aperture radar within a scanning time of the target synthetic aperture radar.
It will be appreciated that synthetic aperture radar will emit a scout signal outwardly when it is scouting a target. The reconnaissance signal can be understood as an electromagnetic wave emitted when the radar reconnaissance the target, and has certain radar parameters such as frequency, bandwidth, pulse width, amplitude, phase and the like. The radar parameters include conventional parameters and intra-pulse characteristic parameters. By receiving various radar signals in the environment and screening through the characteristic parameter characteristics of the synthetic aperture radar, the reconnaissance signal of the target synthetic aperture radar can be obtained. And analyzing the received reconnaissance signal of the synthetic aperture radar to obtain the radar parameters of the target synthetic aperture radar. The radar parameters obtained by analyzing the reconnaissance signals of the target synthetic aperture radar are important basic data when interference work is carried out. It is noted that synthetic aperture radar herein includes any synthetic aperture radar that involves extracting motion information in target echoes for imaging. The operation modes of the synthetic aperture radar here include scanning, strip, beam, sliding beam, and the like.
It is noted that synthetic aperture radars operating in the atmosphere acquire motion compensation parameters required for imaging from echoes of targets and terrain by processing them. Obviously, the interferer needs to simulate the actual motion information parameter extraction process according to the radar parameters of the synthetic aperture radar in order to obtain the motion compensation parameters, so as to finally calculate the theoretical value of the target synthetic aperture radar when extracting the motion compensation parameters for the target area.
It is understood that in order to achieve accurate interference, various influencing factors need to be considered when generating the interference signal. By analyzing the process of influencing the synthetic aperture radar to carry out motion compensation, the interference mode of the interference equipment, the radar parameters of the target synthetic aperture radar and the theoretical value of the target synthetic aperture radar when the motion compensation parameters are extracted aiming at the protection target area can be directly related to the generation of the interference signal. The purpose of influencing or destroying the extraction of the motion compensation parameters is achieved by radiating interference signals, wherein the interference signals comprise but are not limited to noise interference, answer-type interference, forwarding interference and deception interference. The interference method is directed to the extraction of motion compensation parameters in the imaging process of the synthetic aperture radar, including but not limited to doppler center frequency, doppler modulation frequency, motion parameters of a moving object, and the like. The interference method is mainly directed at the parameter extraction process commonly applied in the airborne/missile-borne synthetic aperture radar, and is also applicable to other platform synthetic aperture radars related to the parameter extraction process. The interference method is mainly directed at the main working lobe of the synthetic aperture radar, and is also suitable for the interference mode entering from the side lobe.
It will be appreciated that there will be a scan time for the synthetic aperture radar to perform a reconnaissance. The scan time is a critical time period for acquiring target information. Therefore, in order to improve the interference efficiency, the corresponding interference operation can be performed within the scanning time of the target synthetic aperture radar. In a specific implementation mode, the interference equipment is deployed in a target area needing interference protection in advance, when an enemy airborne/missile-borne synthetic aperture radar reconnaissance-strike irradiates the target area, an interference signal is transmitted to the enemy airborne/missile-borne synthetic aperture radar, the interference signal and a radar echo of the target area enter a synthetic aperture radar receiver together, the extraction of motion compensation parameters of the enemy airborne/missile-borne synthetic aperture radar is influenced or destroyed in the imaging process, imaging is unclear or cannot be carried out, and the enemy is prevented from obtaining target information and protecting the target from being struck. Radar echo is understood here to mean an echo signal. The scanning time can be derived by radar parameters. Referring to fig. 3, in the absence of interference, the target synthetic aperture radar extracts correct parameters for motion compensation, and forms a clear image of the target area. In a specific application scenario, when the target synthetic aperture radar detects a target in an interference environment, a superposed signal of a protection target, a ground object echo and an interference signal is received. At this time, when the target synthetic aperture radar extracts the motion compensation parameter from the superimposed signal, the motion compensation parameter extraction process will be affected due to the addition of the interference signal. Referring to fig. 4, when there is low-intensity interference and the energy of the interference signal is not large, the motion compensation parameter extracted by the target synthetic aperture radar only has a large error, which finally results in a decrease in the motion compensation precision of the synthetic aperture radar. Because the parameters extracted by the synthetic aperture radar are inaccurate, accurate motion compensation cannot be carried out, and a target area becomes a blurred and defocused image. Referring to fig. 5, when there is high-intensity interference and the interference signal energy is sufficient, the target synthetic aperture radar fails to extract the motion compensation parameters, and cannot extract the parameters, so that the target synthetic aperture radar cannot complete motion compensation, and finally cannot image the target area.
Further, the carrying platform of the target synthetic aperture radar operates in the atmosphere.
It should be noted that, according to differences of the operation space, size, weight, and motion characteristics of the synthetic aperture radar mounting platform, the emphasis point and the method of motion compensation are greatly different. The motion compensation can be roughly divided into two types, one is to accurately measure the motion state of the platform by using measuring equipment such as inertial guidance INS and satellite navigation GPS (global positioning system) Beidou carried by the platform, and the other is to extract parameters by extracting motion information contained in target echoes. The satellite-borne platform can meet the motion compensation requirement only by using motion/attitude measurement data, and the airborne/missile-borne platform cannot meet the motion compensation requirement only by using platform measurement data due to the influence of factors such as airflow and the like, and imaging parameters need to be extracted from echo data. Preferably, the operation space of the platform carrying the target synthetic aperture radar is in the atmosphere, that is, the platform carrying the target synthetic aperture radar operates in the atmosphere. For example: the synthetic aperture radar here may be an airborne or missile-borne synthetic aperture radar. Obviously, limiting the platform on which the target synthetic aperture radar is mounted to the platform operating in the atmosphere helps to specifically interfere with the motion compensation process of the synthetic aperture radar, thereby improving interference efficiency.
It will be apparent that the protected target area referred to in the processing module 12 may be an area consisting of fixed position protected targets, such as houses, bridges, dams, etc. The protection target area may also be an area formed by protection targets with constantly changing positions, such as a running train, a moving armored car, a sailing warship and the like. For different protection target areas, the synthetic aperture radar has different data presentation forms, and the final scout data of the synthetic aperture radar also differs. Obviously, the scout data here contain various reflection parameters of the protected target. When the target synthetic aperture radar performs motion compensation, parameters need to be extracted from the echo signals. The echo signal is an electromagnetic wave reflected by the target synthetic aperture radar when the target area is detected. Here the reflection parameters and the reflected electromagnetic waves may directly influence the final imaging of the target synthetic aperture radar. The reconnaissance may be actual reconnaissance of the target synthetic aperture radar on the protection target area, or simulated reconnaissance of the target synthetic aperture radar on the protection target area, which is performed through computer foreplay. When reconnaissance threats of the synthetic aperture radar are responded, various data supports are needed for formulating corresponding protection strategies. In order to interfere the motion compensation process of the synthetic aperture radar in a targeted manner, corresponding simulation analysis can be carried out through radar parameters to deal with the condition that the target is exposed due to the fact that a protection target area is clearly imaged by the synthetic aperture radar, and a corresponding interference scheme is formulated.
Further, the generating module 13 is specifically configured to:
establishing a correlation model according to a preset interference mode, the radar parameter and the theoretical value;
calculating an interference signal parameter interfering the theoretical value according to the correlation model;
and generating an interference signal according to the interference signal parameter.
It should be noted that the association model may be a mathematical model or a neural network model based on artificial intelligence. By establishing the correlation model, the interference signal parameters for generating the interference signal can be quickly confirmed through the known interference mode, radar parameters and theoretical values when the motion compensation parameters are extracted. The interference signal parameter is directly related to a theoretical value when the motion compensation parameter is extracted, and can be directly used for generating an interference signal, so that the generation of the theoretical value is influenced, and finally, the process of motion compensation of the high-efficiency interference target synthetic aperture radar is achieved. The interference signal parameter is understood to be a parameter, such as frequency, bandwidth, pulse width, amplitude, phase, etc., that needs to be set when the interfering device transmits the interference signal.
Specifically, the interference pattern preset in the generating module 13 is interference affecting a clutter center.
It will be appreciated that there are many interference patterns for the interference of synthetic aperture radar. In order to interfere with the motion compensation process of the synthetic aperture radar by the clutter locking method, interference affecting the clutter center may be used. In a specific application scenario, the preset interference pattern may be noise interference. When the target synthetic aperture radar carries out motion compensation operation through clutter locking, the Doppler center frequency is extracted through the center locking of the clutter peak of the surface target. In order to interfere the motion compensation operation of clutter locking, an interference affecting the clutter center, such as noise interference, may be added, shifting the clutter spectrum or causing multiple spectral peaks to appear, resulting in reduced accuracy of the doppler center frequency or inability to measure the doppler center frequency.
Further, the interference pattern preset in the generating module 13 is a multi-strong point target interference.
It is noted that synthetic aperture radars may be motion compensated by means of self-focusing. In order to interfere the motion compensation process of the synthetic aperture radar by the self-focusing mode, multi-strong point target interference can be added. In a specific application scenario, the preset interference pattern may be a point target replication forwarding interference. When the target synthetic aperture radar carries out motion compensation operation through self-focusing, the Doppler frequency modulation is extracted through point target self-focusing. In order to interfere the self-focusing motion compensation operation, a plurality of strong point target interferences such as point target replication forwarding interferences can be added, so that a large number of strong point targets inconsistent with real target parameters are presented in the synthetic aperture radar reconnaissance data, and the self-focusing is failed.
Specifically, the scanning time in the transmitting module 14 is the scanning time of the main lobe of the target synthetic aperture radar.
It is noted that the main lobe is the largest radiation beam located on the antenna pattern, which usually has two or more lobes, where the lobe with the largest radiation intensity is called the main lobe. By limiting the scan time to the scan time of the main lobe of the target synthetic aperture radar, the effectiveness of dealing with the synthetic aperture radar's reconnaissance threat may be improved.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. An interference method for synthetic aperture radar motion compensation is characterized by comprising the following specific steps:
receiving a radar signal, and analyzing to obtain radar parameters of the target synthetic aperture radar;
according to the radar parameters, calculating a theoretical value of the target synthetic aperture radar when the motion compensation parameters are extracted aiming at a protection target area;
generating an interference signal according to a preset interference mode, the radar parameter and the theoretical value;
transmitting the interference signal to the target synthetic aperture radar within a scan time of the target synthetic aperture radar.
2. The jamming method according to claim 1, characterized in that the target synthetic aperture radar carrying platform is operated in the atmosphere.
3. The interference method according to claim 1, wherein the interference signal is generated according to a preset interference pattern, the radar parameter and the theoretical value, and the method comprises the following specific steps:
establishing a correlation model according to a preset interference mode, the radar parameter and the theoretical value;
calculating an interference signal parameter interfering the theoretical value according to the correlation model;
and generating an interference signal according to the interference signal parameter.
4. The interference method according to claim 3, wherein the predetermined interference pattern is an interference affecting a center of a clutter.
5. The interference method according to claim 3, wherein the predetermined interference pattern is a multi-point target interference.
6. The jamming method according to claim 1, characterized in that the scanning time is a scanning time of a main lobe of the target synthetic aperture radar.
7. An interference apparatus for compensating for aperture radar motion, comprising:
the receiving module is used for receiving the radar signal and analyzing to obtain the radar parameter of the target synthetic aperture radar;
the processing module is used for calculating a theoretical value of the target synthetic aperture radar when the motion compensation parameters are extracted aiming at a protection target area according to the radar parameters;
the generating module is used for generating an interference signal according to a preset interference mode, the radar parameter and the theoretical value;
a transmitting module, configured to transmit the interference signal to the target synthetic aperture radar within a scanning time of the target synthetic aperture radar.
8. The jamming device according to claim 7, wherein the target synthetic aperture radar-carrying platform operates within the atmosphere.
9. The jamming device of claim 7, wherein the generating module is specifically configured to:
establishing a correlation model according to a preset interference mode, the radar parameter and the theoretical value;
calculating an interference signal parameter interfering the theoretical value according to the correlation model;
and generating an interference signal according to the interference signal parameter.
10. The jamming device according to claim 9, wherein the predetermined jamming pattern is a jamming affecting a center of a clutter.
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