CN114740436A - Combined interference method and combined interference device for synthetic aperture radar motion compensation - Google Patents
Combined interference method and combined interference device for synthetic aperture radar motion compensation Download PDFInfo
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Abstract
The application discloses a combined interference method and a combined interference device for synthetic aperture radar motion compensation. The combined 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 platform pose theoretical value of a carrying platform of the target synthetic aperture radar and a motion compensation theoretical value of the target synthetic aperture radar when motion compensation parameters are extracted aiming at a protective target area; generating a first interference signal according to a preset first interference mode, radar parameters and a platform pose theoretical value; generating a second interference signal according to a preset second interference mode, radar parameters and a motion compensation theoretical value; in the scanning time of the target synthetic aperture radar, a first interference signal is transmitted to the carrying platform, a second interference signal is transmitted to the target synthetic aperture radar, and the motion compensation process in the imaging processing of the synthetic aperture radar is interfered, so that the high-efficiency interference on the synthetic aperture radar is realized.
Description
Technical Field
The application relates to the technical field of radar countermeasure, in particular to a combined interference method and a combined interference device for synthetic aperture radar motion compensation.
Background
Synthetic Aperture Radar (SAR) is an advanced earth observation sensor, can form a high-resolution two-dimensional image on a ground fixed target, and achieves the purposes of classifying, identifying and positioning the ground target and striking according to the ground target 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, interfering with them by emitting electromagnetic signals is an effective way to combat them.
In the process of realizing the prior art, the inventor finds that:
the existing interference method does not directly interfere the motion compensation of the synthetic aperture radar, the interference mode is simple, and the anti-interference difficulty of the radar is reduced. For the motion compensation process of the synthetic aperture radar in the imaging process, the current interference technology is not well analyzed, and an efficient interference technology specially aiming at the motion compensation function is not available.
Therefore, it is necessary to provide a related technical solution that can implement interference to SAR by destroying motion compensation, so that SAR cannot perform effective imaging processing.
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 and ensure that the SAR cannot carry out effective imaging processing, and is used for solving the technical problem of simple interference mode in the existing interference method.
The application provides a combined 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 platform pose theoretical value of a carrying platform of the target synthetic aperture radar and a motion compensation theoretical value of the target synthetic aperture radar when motion compensation parameters are extracted aiming at a protection target area;
generating a first interference signal according to a preset first interference mode, the radar parameter and the platform pose theoretical value;
generating a second interference signal according to a preset second interference mode, the radar parameter and the motion compensation theoretical value;
and transmitting the first interference signal to the carrying platform and transmitting the second interference signal to the target synthetic aperture radar within the scanning time of the target synthetic aperture radar.
Further, generating a first interference signal according to a preset first interference mode, the radar parameter and the platform pose theoretical value, and the method comprises the following specific steps:
establishing a pose data association model according to a preset first interference mode, the radar parameter and the platform pose theoretical value;
measuring interference levels according to preset poses, and calculating pose measurement interference signal parameters through the pose data association model;
and generating a first interference signal according to the pose measurement interference signal parameter.
Further, generating a second interference signal according to a preset second interference mode, the radar parameter and the motion compensation theoretical value, which includes the following specific steps:
establishing a motion compensation data association model according to a preset second interference mode, the radar parameter and the motion compensation theoretical value;
calculating a motion compensation interference signal parameter through the motion compensation data association model according to a preset motion compensation interference level;
and generating a second interference signal according to the motion compensation interference signal parameter.
Further, the scanning time is the scanning time of the main lobe of the target synthetic aperture radar.
Further, the carrying platform of the target synthetic aperture radar operates in the atmosphere.
Further, the first interference signal is used for interfering the measurement of the platform pose data of the carrying platform through the sensor.
Further, the second interference signal is used for interfering the motion compensation parameter extraction in the target synthetic aperture radar imaging processing process.
The application also provides a combination interference device to aperture radar motion compensation, includes:
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 platform pose theoretical value of a carrying platform of the target synthetic aperture radar and a motion compensation 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 first generation module is used for generating a first interference signal according to a preset first interference mode, the radar parameter and the platform pose theoretical value;
the second generation module is used for generating a second interference signal according to a preset second interference mode, the radar parameter and the motion compensation theoretical value;
and the transmitting module is used for transmitting the first interference signal to the carrying platform and transmitting the second interference signal to the target synthetic aperture radar within the scanning time of the target synthetic aperture radar.
Further, the first generating module is specifically configured to:
establishing a pose data association model according to a preset first interference mode, the radar parameter and the platform pose theoretical value;
measuring interference levels according to preset poses, and calculating pose measurement interference signal parameters through the pose data association model;
and generating a first interference signal according to the pose measurement interference signal parameter.
Further, the second generating module is specifically configured to:
establishing a motion compensation data association model according to a preset second interference mode, the radar parameter and the motion compensation theoretical value;
calculating a motion compensation interference signal parameter through the motion compensation data association model according to a preset motion compensation interference level;
and generating a second interference signal according to the motion compensation interference signal parameter.
The embodiment provided by the application has at least the following beneficial effects:
in the process of detecting and imaging a target protection area by the synthetic aperture radar, starting from a motion compensation mode which can be performed in the synthetic aperture radar imaging processing, a sensor which can be used for pose measurement in a carrying platform of the synthetic aperture radar is interfered, meanwhile, the synthetic aperture radar can be interfered in the process of extracting motion information for motion compensation by echo signals returned from a protection target, the motion compensation process in the synthetic aperture radar imaging processing of the synthetic aperture radar, particularly an airborne/missile-borne platform, is interfered in a mode of combining two interference signals from different angles, the imaging of the synthetic aperture radar on the protection target is interfered, and the high-efficiency interference of the synthetic aperture radar is realized.
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 a combined interference method for synthetic aperture radar motion compensation according to an embodiment of the present disclosure;
fig. 2 is a flowchart illustrating a first interference signal generated in a combined interference method for synthetic aperture radar motion compensation according to an embodiment of the present disclosure;
fig. 3 is a flowchart illustrating a second interference signal generated in a combined interference method for synthetic aperture radar motion compensation according to an embodiment of the present disclosure;
fig. 4 is an imaging scene diagram of a synthetic aperture radar provided in an embodiment of the present application;
fig. 5 is a scout image of a synthetic aperture radar provided in an embodiment of the present application without interference;
fig. 6 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. 7 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. 8 is a schematic diagram of a combined interference apparatus for synthetic aperture radar motion compensation according to an embodiment of the present disclosure.
100 combined interference device for synthetic aperture radar motion compensation
11 receiving module
12 processing module
13 first generation module
14 second generation module
15 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 carry out long-distance high-resolution ground imaging reconnaissance all day long and all weather, and can obtain ground target information.
Referring to fig. 1, a combined interference method for synthetic aperture radar motion compensation provided by 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. The reconnaissance signal of the target synthetic aperture radar can be obtained by receiving various radar signals in the environment and screening through the characteristic parameter characteristics of the synthetic aperture radar. 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 here includes any synthetic aperture radar that images by motion compensation. The operation modes of the synthetic aperture radar here include scanning, strip, beam, sliding beam, and the like.
S200: and calculating a platform pose theoretical value of a carrying platform of the target synthetic aperture radar and a motion compensation 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.
It is noted that the motion compensation methods employed by the synthetic aperture radar in the imaging process can be divided into sensor-based motion compensation and echo or image-based motion compensation. The motion compensation method based on the sensor is to accurately measure the motion state of the platform by using Measurement equipment such as an Inertial Navigation System (INS), an Inertial Measurement Unit (IMU), satellite Navigation and the like on the carrying platform, wherein the satellite Navigation can be a Global Positioning System (GPS), Beidou and the like. The motion compensation method based on the sensor can specifically utilize a GPS/inertial navigation system INS or an inertial measurement unit IMU to acquire various motion parameters of the platform, calculate the motion error of an antenna phase center by combining a space geometric model, and eliminate the influence of the motion error from radar data. Echo or image-based motion compensation mainly extracts parameters from echo data or echo data imaging results and compensates and corrects motion errors, and the method is effectively implemented on the premise that echo data are reflection signals of real targets and ground objects. In practical applications, although motion compensation can be achieved to some extent by using the above methods alone, it is difficult to achieve accurate acquisition of motion error, and motion compensation can be performed by using a combination method. A carrier platform is here understood to be a carrier carrying a synthetic aperture radar, such as an aircraft, a missile, a satellite, etc. The theoretical value of the platform pose can be understood as position data, attitude data and other pose data of the carrying platform obtained by analog calculation after eliminating the motion error of the antenna phase center. The motion compensation theoretical value here can be understood as a compensation and correction motion error extracted based on echo data or echo data imaging result calculated by simulating an actual motion information extraction parameter process. Preferably, the motion compensation theoretical value can be obtained through analog calculation on the basis of combining the platform pose theoretical value. The protection target area can be an area formed by fixed-position protection targets, such as houses, bridges, dams and the like. The protection target area can also be an area formed by protection targets with constantly changing positions, such as a running train, a moving armored vehicle, a sailing naval vessel 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 differ, wherein the scout data comprise various reflection parameters of the protection target. In practical application scenarios, the specific motion compensation method adopted by the target synthetic aperture radar to be interfered in the imaging processing is often unknown. A platform operating in space, such as a satellite-borne platform, can meet the motion compensation requirement only by using motion/attitude measurement data. Due to the influence of factors such as airflow and the like on a platform operating in the atmosphere, the motion/attitude measurement data of the platform can not meet the motion compensation requirement of the situation with higher imaging requirement in some scenes, and imaging parameters need to be extracted from echo data. 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. It can be understood that when dealing with the reconnaissance threat of the synthetic aperture radar, various data supports are needed for making the corresponding protection strategy. In order to interfere the motion compensation process of the synthetic aperture radar in a targeted manner, the condition that the target is exposed due to the fact that the protective target area is clearly imaged by the synthetic aperture radar is solved, corresponding simulation analysis can be carried out through radar parameters, and a corresponding interference scheme is formulated.
S300: and generating a first interference signal according to a preset first interference mode, the radar parameter and the platform pose theoretical value.
It will be appreciated that for interfering with the measurement of the motion parameter by the sensor in the form of a sensor-based motion compensation of the synthetic aperture radar, various influencing factors need to be taken into account when generating the first interfering signal. By analyzing and influencing the motion compensation process of the synthetic aperture radar based on the sensor, the interference mode of the interference equipment, the radar parameter of the target synthetic aperture radar and the platform pose theoretical value of the carrying platform of the target synthetic aperture radar can be directly related to the generation of the first interference signal. The interference pattern of the interfering device is here understood to be a preset first interference pattern. The purpose that the carrying platform of the target synthetic aperture radar is influenced or destroyed to measure various motion parameters through the sensor is achieved by radiating the first interference signal. The first interference signal includes, but is not limited to, noise interference, answer-back interference, forward interference, and spoof interference. The interference method is mainly aimed at the motion parameter measurement process of a carrying platform in a sensor-based motion compensation method commonly applied to an airborne/missile-borne synthetic aperture radar, and is also suitable for other platform synthetic aperture radars adopting the sensor-based motion compensation method. 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 a first interference signal according to a preset first interference mode, the radar parameter, and the theoretical value of the platform pose, includes the following specific steps:
s301: establishing a pose data association model according to a preset first interference mode, the radar parameter and the platform pose theoretical value;
s302: measuring interference levels according to preset poses, and calculating pose measurement interference signal parameters through the pose data association model;
s303: and generating a first interference signal according to the pose measurement interference signal parameter.
It should be noted that the pose data association model may be a mathematical model or a neural network model based on artificial intelligence. By establishing the pose data association model, an association relation can be established among a preset first interference mode, radar parameters and platform pose theoretical values, and pose measurement interference signal parameters for generating a first interference signal are quickly determined through the set pose measurement interference level. The pose measurement interference level is used to determine the interference strength of the first interference signal. The pose measurement interference signal parameters are directly related to the platform pose theoretical value and can be directly used for generating a first interference signal, so that the motion parameter measurement operation of the carrying platform through the sensor is influenced, and the process of calculating the motion error of the antenna phase center of the carrying platform is influenced or destroyed. The pose measurement interference signal parameters can be understood as parameters, such as frequency, bandwidth, pulse width, amplitude, phase and the like, which need to be set when the interference device transmits the first interference signal.
S400: and generating a second interference signal according to a preset second interference mode, the radar parameter and the motion compensation theoretical value.
It will be appreciated that for interfering with echo or image based motion compensation of the target synthetic aperture radar, various influencing factors need to be taken into account when generating the second interfering signal. By analyzing the process of influencing the synthetic aperture radar to perform motion compensation based on the echo parameters, the interference mode of the interference equipment, the radar parameters of the target synthetic aperture radar and the motion compensation 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 second interference signal. The interference pattern of the interfering device may be understood here as a preset second interference pattern. The method can achieve the purpose of influencing or destroying the extraction of the motion compensation parameters based on the echo parameters by radiating second interference signals, wherein the second interference signals comprise but are not limited to noise interference, answer-type interference, forwarding interference and deception interference. The interference method is mainly directed to the echo-based parameter extraction process commonly applied in airborne/missile-borne synthetic aperture radars, and is also applicable to other platform synthetic aperture radars related to the echo-based 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.
Specifically, referring to fig. 3, generating a second interference signal according to a preset second interference pattern, the radar parameter, and the motion compensation theoretical value includes the following specific steps:
s401: establishing a motion compensation data association model according to a preset second interference mode, the radar parameter and the motion compensation theoretical value;
s402: calculating a motion compensation interference signal parameter through the motion compensation data association model according to a preset motion compensation interference level;
s403: and generating a second interference signal according to the motion compensation interference signal parameter.
It should be noted that the motion compensation data correlation model here may be a mathematical model or a neural network model based on artificial intelligence. By establishing the motion compensation data association model, a close association relation can be established among the preset interference mode, the radar parameter and the motion compensation theoretical value when the motion compensation parameter is extracted, and the motion compensation interference signal parameter for generating the second interference signal is quickly confirmed through the preset motion compensation interference level. The motion compensated interference level is here used to determine the interference strength of the second interfering signal. The motion compensation interference signal parameter is directly associated with a motion compensation theoretical value when the motion compensation parameter is extracted, and can be directly used for generating a second interference signal, so that the operation of extracting the parameter from echo data or an echo data imaging result by the target synthetic aperture radar is influenced, and finally the process of performing motion compensation on the interference target synthetic aperture radar based on the echo or the image is achieved. The motion compensated interference signal parameters are understood to be parameters, such as frequency, bandwidth, pulse width, amplitude, phase, etc., that are to be set when the interfering device transmits the second interference signal.
S500: and transmitting the first interference signal to the carrying platform and transmitting the second interference signal to the target synthetic aperture radar within the scanning 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 scanning time is a key time period for the synthetic aperture radar to acquire target information. Therefore, in order to improve the interference efficiency, the target synthetic aperture radar can be subjected to corresponding interference operation within the scanning time of the target synthetic aperture radar. In a specific embodiment, referring to fig. 4, during the imaging motion, the platform carrying the synthetic aperture radar is affected by external factors, and its actual course is not consistent with the ideal course, and always deviates from the ideal motion state required by the imaging, resulting in a motion error, which needs to be compensated and corrected for the precise imaging of the synthetic aperture radar. Assuming that motion compensation of the target synthetic aperture radar is performed in a combined manner, motion compensation in the imaging process is carried out by using sensor-based motion compensation and echo or image-based motion compensation in combination. Wherein, the motion compensation based on the sensor is generally required to be completed through a navigation satellite constellation. Aiming at a motion compensation method in a combined mode, the method can integrate and construct interference equipment comprising an interference source 1 and an interference source 2, the interference equipment is deployed in a target area corresponding to a target needing interference protection in advance, and when an enemy synthetic aperture radar reconnaissance-strike irradiation target area, a satellite navigation interference signal and an SAR interference signal are transmitted to the target area. The satellite navigation interference signal enters a motion/attitude measurement receiver of a synthetic aperture radar carrying platform, and the parameter measurement operation of the motion/attitude measurement receiver through a sensor is damaged, so that the motion/attitude measurement receiver cannot accurately position and fix the attitude in real time. The SAR interference signal enters the synthetic aperture radar receiver together with the radar echo of the target area in an electronic interference mode, and the extraction of the motion compensation parameter based on the echo or the image is influenced or destroyed in the imaging process of the synthetic aperture radar, so that the imaging of the synthetic aperture radar is unclear or cannot be performed, the enemy is prevented from acquiring target information, and the target is protected from being attacked. In the actual interference signal transmitting operation process, two interference signals, namely a satellite navigation interference signal and an SAR interference signal, can be transmitted simultaneously, and signal synchronization in a strict sense is not required at the same time, so long as effective interference is realized in most of time. The satellite navigation interference signal is understood here to be the first interference signal emitted by the interference source 1. The SAR interference signal is here understood to be the second interference signal emitted by the interference source 2. Radar echo is understood here to mean an echo signal. The scanning time can be derived by radar parameters. The integrally constructed interference device including the interference source 1 and the interference source 2 may be, but is not limited to, formed by 1, 2 or more interference devices. Referring to fig. 5, the interference device is deployed in the interference-protected target area, and the target synthetic aperture radar performs normal motion compensation without interference, and performs motion compensation by obtaining correct parameters to form a clear image of the target area. In a specific application scenario, when a target synthetic aperture radar detects a target in an interference environment, a superposed signal of a protection target, a ground object echo, a first interference signal and a second interference signal is received. At the moment, if the target synthetic aperture radar adopts a sensor-based motion compensation method, the motion parameter measurement operation of the carrying platform is influenced by the first interference signal; if the target synthetic aperture radar adopts a motion compensation method based on echo or image, when the motion compensation parameter is extracted from the superposed signal, the motion compensation parameter extraction process will be affected due to the addition of the second interference signal. Referring to fig. 6, when there is low-intensity interference and the energy of the interference signal is not large, the error between the motion parameter measured by the platform and the motion compensation parameter extracted by the target synthetic aperture radar is increased, which finally results in the reduction of 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. 7, when there is high-intensity interference and the interference signal energy is sufficient, if the target synthetic aperture radar adopts a sensor-based motion compensation method, the measurement of the motion parameters of the mounting platform fails, and the motion parameters of the mounting platform cannot be measured; if the target synthetic aperture radar adopts a motion compensation method based on the echo or the image, the target synthetic aperture radar fails to extract the motion compensation parameters and cannot extract the parameters in the echo data or the echo imaging result, so that the target synthetic aperture radar cannot complete the motion compensation and finally cannot image a target area.
Further, 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.
Specifically, the carrying platform of the target synthetic aperture radar operates in the atmosphere.
It should be noted that, according to differences in 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 through 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 target synthetic aperture radar platform as a platform operating in the atmosphere helps to specifically interfere with the sensor-based motion compensation and echo or image-based motion compensation processes of the synthetic aperture radar, thereby improving the interference efficiency.
Further, the first interference signal is used for interfering the measurement of the platform pose data of the carrying platform through the sensor.
It should be noted that there are many interference patterns for the synthetic aperture radar, and the interference signals transmitted by different interference patterns are different. Meanwhile, even if the interference patterns are the same, when the interference purposes are different, the corresponding interference signals are obviously different. The first interference signal in this application is mainly used to disrupt the sensor based motion compensation process. Specifically, the first interference signal affects or destroys a sensor arranged on the carrying platform and used for acquiring various motion parameters of the platform, destroys parameter measurement operation of the sensor, and finally affects operation of calculating a motion error of an antenna phase center by combining the platform with a space geometric model. Preferably, the sensor here means a GPS sensor. The GPS has the advantage of good long-term stability, is mainly used for correcting INS/IMU drift, and is widely applied to a carrying platform of an actual synthetic aperture radar.
Specifically, the second interference signal is used for interfering with motion compensation parameter extraction in the target synthetic aperture radar imaging processing process.
It can be understood that, when the synthetic aperture radar is interfered, multiple interference modes can be adopted, interference signals emitted by different interference modes are different, and even if the same interference mode is adopted, when the interference purpose is different, the corresponding interference signals are also obviously different. The second interference signal in the present application is mainly used to disrupt the echo or image based motion compensation process. Specifically, the second interference signal prevents the synthetic aperture radar from effectively compensating and correcting the motion error by influencing or destroying the process of extracting the parameters from the echo data or the echo data imaging result by the synthetic aperture radar, so that the interference of extracting the motion compensation parameters in the synthetic aperture radar imaging processing process is realized.
Referring to fig. 8, the present application further provides a combined interference apparatus 100 for synthetic aperture radar motion compensation, 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, according to the radar parameter, a platform pose theoretical value of a carrying platform of the target synthetic aperture radar and a motion compensation theoretical value of the target synthetic aperture radar when a motion compensation parameter is extracted for a target protection area;
the first generation module 13 is configured to generate a first interference signal according to a preset first interference mode, the radar parameter, and the platform pose theoretical value;
a second generating module 14, configured to generate a second interference signal according to a preset second interference mode, the radar parameter, and the motion compensation theoretical value;
and the transmitting module 15 is configured to transmit the first interference signal to the carrying platform and transmit the second interference signal to the target synthetic aperture radar within the 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. The receiving module 11 receives various radar signals in the environment, and screens the radar signals through the characteristic parameter characteristics of the synthetic aperture radar, so as to obtain a reconnaissance signal of the target synthetic aperture radar. 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 here includes any synthetic aperture radar that images by motion compensation. The operation modes of the synthetic aperture radar here include scanning, strip, beam, sliding beam, and the like.
It is noted that the motion compensation methods employed by the synthetic aperture radar in the imaging process can be divided into sensor-based motion compensation and echo or image-based motion compensation. The motion compensation method based on the sensor is to accurately measure the motion state of the platform by using Measurement equipment such as an Inertial Navigation System (INS), an Inertial Measurement Unit (IMU), satellite Navigation and the like on the carrying platform, wherein the satellite Navigation can be a Global Positioning System (GPS), Beidou and the like. The motion compensation method based on the sensor can specifically utilize a GPS/inertial navigation system INS or an inertial measurement unit IMU to acquire various motion parameters of the platform, calculate the motion error of an antenna phase center by combining a space geometric model, and eliminate the influence of the motion error from radar data. Echo or image-based motion compensation mainly extracts parameters from echo data or echo data imaging results and compensates and corrects motion errors, and the method is effectively implemented on the premise that echo data are reflection signals of real targets and ground objects. In practical applications, although motion compensation can be achieved to some extent by using the above methods alone, it is difficult to achieve accurate acquisition of motion error, and motion compensation can be performed by using a combination method. The carrier platform described in the processing module 12 may be understood as a carrier carrying a synthetic aperture radar, such as an aircraft, missile, satellite, etc. The theoretical value of the platform pose can be understood as position data, attitude data and other pose data of the carrying platform obtained by analog calculation after eliminating the motion error of the antenna phase center. The motion compensation theoretical value here can be understood as a compensation and correction motion error extracted based on echo data or echo data imaging results calculated by simulating an actual motion information extraction parameter process. Preferably, the motion compensation theoretical value can be obtained through simulation calculation on the basis of combining the platform pose theoretical value. The protection target area can be an area formed by a protection target with a fixed position, such as a house, a bridge, a dam and the like. The protection target area can also be an area formed by protection targets with constantly changing positions, such as a running train, a moving armored car, a sailing naval vessel 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 differ, wherein the scout data comprise various reflection parameters of the protection target. In practical application scenarios, the specific motion compensation method adopted by the target synthetic aperture radar to be interfered in the imaging processing is often unknown. A platform operating in space, such as a satellite-borne platform, can meet the requirement of motion compensation only by using motion/attitude measurement data. Due to the influence of factors such as airflow and the like on a platform operating in the atmosphere, the motion/attitude measurement data of the platform can not meet the motion compensation requirement of the situation with higher imaging requirement in some scenes, and imaging parameters need to be extracted from echo data. 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 can be actual reconnaissance of the target synthetic aperture radar on the protection target area, and can also be simulated reconnaissance of the target synthetic aperture radar on the protection target area through computer preview. It can be understood that when dealing with the reconnaissance threat of the synthetic aperture radar, various data supports are needed for making the corresponding protection strategy. 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 will be appreciated that in order to interfere with the measurement of the motion parameters by the sensors by the synthetic aperture radar using sensor-based motion compensation, the first generation module 13 needs to take into account various influencing factors when generating the first interference signal. By analyzing and influencing the motion compensation process of the synthetic aperture radar based on the sensor, the interference mode of the interference equipment, the radar parameter of the target synthetic aperture radar and the platform pose theoretical value of the carrying platform of the target synthetic aperture radar can be directly related to the generation of the first interference signal. The interference pattern of the interfering device is here understood to be a preset first interference pattern. The purpose that the carrying platform of the target synthetic aperture radar is influenced or destroyed to measure various motion parameters through the sensor is achieved by radiating the first interference signal. The first interference signal includes, but is not limited to, noise interference, answer-back interference, forward interference, and spoof interference. The interference method is mainly used for measuring the motion parameters of the carrying platform in a motion compensation method based on a sensor, which is commonly applied to airborne/missile-borne synthetic aperture radars, and is also suitable for other platform synthetic aperture radars adopting the motion compensation method based on the sensor. 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 for interfering with echo or image based motion compensation of the target synthetic aperture radar, the second generation module 14 needs to take into account various influencing factors when generating the second interfering signal. By analyzing the process of influencing the synthetic aperture radar to perform motion compensation based on the echo parameters, the interference mode of the interference equipment, the radar parameters of the target synthetic aperture radar and the motion compensation 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 second interference signal. The interference pattern of the interfering device may be understood here as a preset second interference pattern. The method can achieve the purpose of influencing or destroying the extraction of the motion compensation parameters based on the echo parameters by radiating second interference signals, wherein the second interference signals comprise but are not limited to noise interference, answer-type interference, forwarding interference and deception interference. The interference method is mainly directed to the echo-based 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 echo-based 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 scanning time is a key time period for the synthetic aperture radar to acquire target information. Therefore, in order to improve the interference efficiency, the transmitting module 15 may perform a corresponding interference operation on the target synthetic aperture radar within the scanning time of the target synthetic aperture radar. In a specific embodiment, referring to fig. 4, during the imaging motion, the platform carrying the synthetic aperture radar is affected by external factors, and its actual course is not consistent with the ideal course, and always deviates from the ideal motion state required by the imaging, resulting in a motion error, which needs to be compensated and corrected for the precise imaging of the synthetic aperture radar. Assuming that motion compensation of the target synthetic aperture radar is performed in a combined manner, motion compensation in the imaging process is carried out by using sensor-based motion compensation and echo or image-based motion compensation in combination. Wherein the sensor-based motion compensation generally needs to be done by a navigation satellite constellation. Aiming at a motion compensation method in a combined mode, the method can integrate and construct interference equipment comprising an interference source 1 and an interference source 2, the interference equipment is deployed in a target area corresponding to a target needing interference protection in advance, and when an enemy synthetic aperture radar reconnaissance-attack irradiates the target area, a satellite navigation interference signal and an SAR interference signal are transmitted to the enemy synthetic aperture radar. The satellite navigation interference signal enters a motion/attitude measurement receiver of a synthetic aperture radar carrying platform, and the parameter measurement operation of the motion/attitude measurement receiver through a sensor is damaged, so that the motion/attitude measurement receiver cannot accurately position and fix the attitude in real time. The SAR interference signal enters the synthetic aperture radar receiver together with the radar echo of the target area in an electronic interference mode, and the extraction of the motion compensation parameter of the synthetic aperture radar based on the echo or the image is influenced or destroyed in the imaging process of the synthetic aperture radar, so that the synthetic aperture radar is not clear or cannot image, the enemy is prevented from acquiring target information, and the target is protected from being hit. In the actual interference signal transmitting operation process, two interference signals, namely a satellite navigation interference signal and an SAR interference signal, can be transmitted simultaneously, and signal synchronization in a strict sense is not required at the same time, so long as effective interference is realized in most of time. The satellite navigation interference signal is understood here to be the first interference signal emitted by the interference source 1. The SAR interference signal is understood here to mean a second interference signal emitted by the interference source 2. Radar echo is understood here to mean an echo signal. The scanning time can be derived by radar parameters. The integrally constructed interference device including the interference source 1 and the interference source 2 may be, but is not limited to, formed by 1, 2 or more interference devices. Referring to fig. 5, the interference device is deployed in the interference-protected target area, and the target synthetic aperture radar performs normal motion compensation without interference, and performs motion compensation by obtaining correct parameters to form a clear image of the target area. In a specific application scenario, when a target synthetic aperture radar detects a target in an interference environment, a superposed signal of a protection target, a ground object echo, a first interference signal and a second interference signal is received. At the moment, if the target synthetic aperture radar adopts a sensor-based motion compensation method, the motion parameter measurement operation of the carrying platform is influenced by the first interference signal; if the target synthetic aperture radar adopts a motion compensation method based on echo or image, when the motion compensation parameter is extracted from the superposed signal, the motion compensation parameter extraction process will be affected due to the addition of the second interference signal. Referring to fig. 6, when there is low-intensity interference and the energy of the interference signal is not large, the error between the motion parameter measured by the platform and the motion compensation parameter extracted by the target synthetic aperture radar is increased, which finally results in the reduction of 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. 7, when there is high-intensity interference and the interference signal energy is sufficient, if the target synthetic aperture radar adopts a sensor-based motion compensation method, the measurement of the motion parameters of the carrying platform fails, and the motion parameters of the carrying platform cannot be measured; if the target synthetic aperture radar adopts a motion compensation method based on the echo or the image, the target synthetic aperture radar fails to extract the motion compensation parameters and cannot extract the parameters in the echo data or the echo imaging result, so that the target synthetic aperture radar cannot complete the motion compensation and finally cannot image a target area.
Further, the first generating module 13 is specifically configured to:
establishing a pose data association model according to a preset first interference mode, the radar parameter and the platform pose theoretical value;
measuring interference levels according to preset poses, and calculating pose measurement interference signal parameters through the pose data association model;
and generating a first interference signal according to the pose measurement interference signal parameter.
It should be noted that the pose data association model described in the first generation module 13 may be a mathematical model or an artificial intelligence-based neural network model. By establishing the pose data association model, an association relation can be established among a preset first interference mode, radar parameters and platform pose theoretical values, and pose measurement interference signal parameters for generating a first interference signal are quickly determined through the set pose measurement interference level. The pose measurement interference level is used to determine the interference strength of the first interference signal. The pose measurement interference signal parameters are directly related to the platform pose theoretical value and can be directly used for generating a first interference signal, so that the motion parameter measurement operation of the carrying platform through the sensor is influenced, and the process of calculating the motion error of the antenna phase center of the carrying platform is influenced or destroyed. The pose measurement interference signal parameters can be understood as parameters, such as frequency, bandwidth, pulse width, amplitude, phase and the like, which need to be set when the interference device transmits the first interference signal.
Further, the second generating module 14 is specifically configured to:
establishing a motion compensation data association model according to a preset second interference mode, the radar parameter and the motion compensation theoretical value;
calculating a motion compensation interference signal parameter through the motion compensation data association model according to a preset motion compensation interference level;
and generating a second interference signal according to the motion compensation interference signal parameter.
It should be noted that the motion compensation data correlation model involved in the second generation module 14 may be a mathematical model or an artificial intelligence based neural network model. By establishing the motion compensation data association model, a close association relationship can be established among a preset interference mode, radar parameters and motion compensation theoretical values when the motion compensation parameters are extracted, and the motion compensation interference signal parameters for generating the second interference signal are quickly confirmed through a preset motion compensation interference level. The motion compensated interference level is here used to determine the interference strength of the second interfering signal. The motion compensation interference signal parameter is directly associated with a motion compensation theoretical value when the motion compensation parameter is extracted, and can be directly used for generating a second interference signal, so that the operation of extracting the parameter from echo data or an echo data imaging result by the target synthetic aperture radar is influenced, and finally the process of performing motion compensation on the interference target synthetic aperture radar based on the echo or the image is achieved. The motion compensated interference signal parameters are understood to be parameters, such as frequency, bandwidth, pulse width, amplitude, phase, etc., that need to be set when the interfering device transmits the second interference signal.
Further, 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 scanning time in the transmit module 15 to the scanning time of the main lobe of the target synthetic aperture radar, the effectiveness of dealing with the reconnaissance threat of the synthetic aperture radar can be improved.
Specifically, 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 through 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 sensor-based motion compensation and echo or image-based motion compensation processes of the synthetic aperture radar, thereby improving the interference efficiency.
Further, the first interference signal is used for interfering the measurement of the platform pose data of the carrying platform through the sensor.
It should be noted that there are many interference patterns for the synthetic aperture radar, and the interference signals transmitted by different interference patterns are different. Meanwhile, even if the same interference pattern is used, when the interference purpose is different, the corresponding interference signals are obviously different. The first interference signal in the combined interference device 100 for synthetic aperture radar motion compensation is mainly used to disrupt the sensor-based motion compensation process. Specifically, the first interference signal affects or destroys a sensor arranged on the carrying platform and used for acquiring various motion parameters of the platform, destroys parameter measurement operation of the sensor, and finally affects operation of calculating a motion error of an antenna phase center by combining the platform with a space geometric model. Preferably, the sensor here means a GPS sensor. The GPS has the advantage of good long-term stability, is mainly used for correcting INS/IMU drift, and is widely applied to a carrying platform of an actual synthetic aperture radar.
Specifically, the second interference signal is used for interfering with motion compensation parameter extraction in the target synthetic aperture radar imaging processing process.
It can be understood that when the synthetic aperture radar is interfered, a plurality of interference modes can be adopted, interference signals emitted by different interference modes are different, and even if the same interference mode is used, when the interference purpose is different, the corresponding interference signals can be obviously different. The second interference signal in the combined interference device 100 for synthetic aperture radar motion compensation is mainly used for destroying the echo or image based motion compensation process. Specifically, the second interference signal prevents the synthetic aperture radar from effectively compensating and correcting the motion error by influencing or destroying the process of extracting the parameters from the echo data or the echo data imaging result by the synthetic aperture radar, so that the interference of extracting the motion compensation parameters in the synthetic aperture radar imaging processing process is realized.
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. A combined 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 platform pose theoretical value of a carrying platform of the target synthetic aperture radar and a motion compensation theoretical value of the target synthetic aperture radar when motion compensation parameters are extracted aiming at a protection target area;
generating a first interference signal according to a preset first interference mode, the radar parameter and the platform pose theoretical value;
generating a second interference signal according to a preset second interference mode, the radar parameter and the motion compensation theoretical value;
and transmitting the first interference signal to the carrying platform and transmitting the second interference signal to the target synthetic aperture radar within the scanning time of the target synthetic aperture radar.
2. The combined interference method according to claim 1, wherein a first interference signal is generated according to a preset first interference mode, the radar parameters and the theoretical value of the platform pose, and the method comprises the following specific steps:
establishing a pose data association model according to a preset first interference mode, the radar parameters and the platform pose theoretical value;
measuring interference levels according to preset pose, and calculating pose measurement interference signal parameters through the pose data association model;
and generating a first interference signal according to the pose measurement interference signal parameter.
3. The combined interference method according to claim 1, wherein generating a second interference signal according to a preset second interference pattern, the radar parameter and the motion compensation theoretical value comprises the following specific steps:
establishing a motion compensation data association model according to a preset second interference mode, the radar parameter and the motion compensation theoretical value;
calculating a motion compensation interference signal parameter through the motion compensation data association model according to a preset motion compensation interference level;
and generating a second interference signal according to the motion compensation interference signal parameter.
4. The combined interference method according to claim 1, characterized in that the scan time is a scan time of a main lobe of the target synthetic aperture radar.
5. The combined interference method according to claim 1, characterized in that the target synthetic aperture radar platform is operated in the atmosphere.
6. The combined interference method of claim 1, wherein the first interference signal is used to interfere with the onboard platform's measurement of platform pose data by sensors.
7. The combined interference method of claim 1, wherein the second interference signal is used to interfere with motion compensation parameter extraction in the target synthetic aperture radar imaging process.
8. A combined 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 platform pose theoretical value of a carrying platform of the target synthetic aperture radar and a motion compensation 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 first generation module is used for generating a first interference signal according to a preset first interference mode, the radar parameter and the platform pose theoretical value;
the second generation module is used for generating a second interference signal according to a preset second interference mode, the radar parameter and the motion compensation theoretical value;
and the transmitting module is used for transmitting the first interference signal to the carrying platform and transmitting the second interference signal to the target synthetic aperture radar within the scanning time of the target synthetic aperture radar.
9. The combined interference apparatus of claim 8, wherein the first generating module is specifically configured to:
establishing a pose data association model according to a preset first interference mode, the radar parameter and the platform pose theoretical value;
measuring interference levels according to preset poses, and calculating pose measurement interference signal parameters through the pose data association model;
and generating a first interference signal according to the pose measurement interference signal parameters.
10. The combined interference apparatus of claim 8, wherein the second generating module is specifically configured to:
establishing a motion compensation data association model according to a preset second interference mode, the radar parameter and the motion compensation theoretical value;
calculating a motion compensation interference signal parameter through the motion compensation data association model according to a preset motion compensation interference level;
and generating a second interference signal according to the motion compensation interference signal parameter.
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