CN114966574A - Active electronic camouflage interference method for resisting spaceborne SAR reconnaissance - Google Patents
Active electronic camouflage interference method for resisting spaceborne SAR reconnaissance Download PDFInfo
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Abstract
The invention discloses an active electronic camouflage interference method for resisting satellite-borne SAR reconnaissance, and S1, electromagnetic camouflage time interval calculation considering terrain information; s2, generating false target electromagnetic signals based on scattering distribution increment; s3, carrying out distributed networking interference; firstly, resolving a camouflage interference time period by combining topographic information, establishing a target background template according to the existing radar image information, generating interference information of a false target by adopting a scattering distribution increment mode, and finally modulating the interference information into radar signals for transmission by adopting a distributed networking interference mode, so that the problems of error accumulation and the like caused by respectively estimating SAR motion parameters and signal parameters are solved, and the fidelity and the timeliness of electromagnetic camouflage are improved.
Description
Technical Field
The invention belongs to the technical field of radar signal transmission, and particularly relates to an active electronic camouflage interference method for resisting satellite-borne SAR reconnaissance.
Background
The synthetic aperture radar is an active microwave imaging radar, can monitor a target all day long, all weather long distance, and has high resolution in distance direction and azimuth direction. With the continuous improvement of the target information acquisition capability of the spaceborne SAR, an active electronic camouflage method aiming at the imaging characteristics of the spaceborne SAR is continuously improved.
Aiming at an active electronic camouflage method, Wangshengli proposes an electromagnetic camouflage interference frequency domain implementation method aiming at SAR signals, so that the real-time processing efficiency is improved; the Zhongfeng et al provides various interference models for optimizing scattered wave interference, large scene interference, electromagnetic interference and the like aiming at SAR signal electromagnetic camouflage interference, and Chengian et al provides an electromagnetic camouflage interference approximate processing method based on DRFM.
There are two main analysis objects of the SAR electromagnetic camouflage interference technology: one is for SAR scenarios and one is for SAR targets, such as adding false vehicles on a uniform surface, changing the farm field to a forest farm. The similarity between the modulation signal and the real signal directly influences the final camouflage effect, and the modulation signal depends on the scattering distribution characteristics of the target, the parameters of the detection radar system and the accurate acquisition of the relative motion relation between the radar and the target. The difficulty of the camouflage technology for the SAR scene and the SAR target is how to accurately acquire the parameter of the radar system and the parameter information of the transmitted signal.
Changxin et al have conducted discussion on the problem of reducing deception jamming coincidence, and have proposed a deception jamming method based on two-dimensional separation, so that the main lobe width is enlarged, and a low-resolution mosaic scene is generated. The WK algorithm is provided by wooddak baking and the like, the radar gray level scene image can be quickly converted into interference signals, and the interference signals are transmitted in an SAR side lobe area one by using an interference machine to interfere with important characteristics of a real SAR image in real time. The caramel treats proposes a deception jamming technology based on scattering distribution increment, adjusts the template size of a block splicing synthesis technology, obtains a false scene with high similarity, artificially reduces the dependence of SAR track parameters by Zhao Bo and the like, proposes a theoretical multi-receiver thought, and solves the problem of error amplification of a linear equation set in jamming coefficient calculation. The Wang seedling improves SAR deception jamming algorithm of scattering distribution increment mode, and solves the problem that part of increment is negative.
At present, a deception scene is obtained by directly superposing a false scene on a real scene generally by an SAR electronic disguise method, the deception scene and the real scene are randomly superposed and are not the sum of simple scattering coefficients by combining a speckle model, the generated deception scene and the false target scene have low similarity, and disguise signals are easy to find. In addition, when the spaceborne SAR electromagnetic camouflage signal is generated, the instantaneous position information of the target and the SAR platform is a key parameter which influences the effectiveness of the camouflage signal, usually, in order to improve the efficiency, the second-order Taylor series expansion is carried out on the slope distance, errors caused by inaccurate parameter estimation of each SAR platform can be introduced and accumulated in the parameter estimation process of the method, the fidelity of the electromagnetic camouflage is reduced, and the electromagnetic camouflage interference robustness is poor.
Disclosure of Invention
The present invention aims to provide an active electronic camouflage interference method for resisting spaceborne SAR reconnaissance, so as to solve the problems in the background art.
In order to achieve the purpose, the invention provides the following technical scheme: an active electronic camouflage interference method for resisting satellite-borne SAR reconnaissance is characterized by comprising the following specific steps:
s1, electromagnetic camouflage time interval calculation considering terrain information: reading the central position of the target area and peripheral DEM model data, and then calculating to obtain the set duration of the disguised time;
s2, generating false target electromagnetic signals based on the scattering distribution increment: performing down-conversion processing on the signal through a radar signal receiver, performing subsequent processing, and performing up-conversion to obtain carrier frequency for retransmission;
s3, carrying out distributed networking interference: the method comprises the steps of adopting an interference machine as a main site of a transceiver, additionally arranging a plurality of receivers as auxiliary sites for receiving radar signals, carrying out down-conversion processing on the received SAR signals, then carrying out processing camouflage on the SAR signals, finally carrying out up-conversion processing and transmitting.
Preferably, the specific operation of step S1 is as follows:
step S101, reading the central position of a target area and peripheral DEM model data, calculating the altitude angle between the highest point of a ground object and the target area under different azimuth angles, and taking the value as a terrain cut-off altitude threshold value;
s102, dynamically setting satellite orbit parameters and a sensor imaging angle range by using autonomous development software, and acquiring instantaneous geometric information between a satellite and a target;
s103, comparing whether the instantaneous altitude between the satellite and the target simultaneously meets the imaging angle of the sensor and a terrain cutoff altitude threshold, calculating critical time meeting altitude angle conditions in a linear interpolation mode, and calculating radar imaging effective duration of a target area by using the critical time;
and step S104, calculating the camouflage time setting, and performing electromagnetic signal camouflage according to the satellite overhead effective time.
Preferably, the specific operation of step S2 is as follows:
step S201, performing down-conversion processing on a radar signal receiver, sampling by an analog-to-digital converter, storing in a digital radio frequency memory, correcting according to the energy of a target radar detection unit and a detection radar detection unit by using the existing radar image data, correcting and modulating the radar energy according to the processing gain and loss parameters of a radar system, using the radar energy as a background scene, and selecting a target template from a target template library;
step S202, carrying out texture synthesis on the template target and the background scene by using a texture synthesis technology, and carrying out amplitude adjustment according to parameters such as radar system gain to generate a virtual background. Calculating a backscattering coefficient difference value between a real scene and a virtual scene target according to a virtual background, wherein obvious edge traces are easy to appear at the edge part between the virtual target and the real scene, so that smooth attenuation processing is adopted, two smooth transition functions are utilized from left to right and from top to bottom respectively, one is an attenuation function and the other is an increasing function, and effective background fusion is carried out in a boundary area to obtain target background characteristic parameters after edge processing;
step S203, simultaneously, calculating a shadow area of a real target, obtaining a modulation item which has no relation with the azimuth fast time according to the shadow point position and the backscattering coefficient of the superposed background, carrying out azimuth modulation on the signal, and weighting and summing to obtain an interference signal characteristic parameter;
step S204, processing each intercepted pulse sample by using a programmable target integrated circuit, performing time delay processing, and modulating a modulator by using a series of complex distances to generate an electromagnetic signal of a camouflage background;
step S205, converting the digital signal into an analog signal by using a digital-to-analog converter, and performing up-conversion to obtain a carrier frequency for retransmission.
Preferably, the specific operation method of step S3 is as follows:
with O jam Establishing an interference scene coordinate system parallel to a radar platform coordinate system as a center, wherein a triangle is an interference machine auxiliary site and is used for intercepting SAR signals, a blue dotted line is a real motion track of the SAR platform, and each time t of the SAR platform is a The coordinates of (a) are:
T s (t a )＝(u s ，v s ，w s ) T
suppose there are N secondary sites, with rec i Is expressed as coordinates of
rec i ＝(u i ，v i ，w i ) T
Wherein i represents the ith receiver, and the coordinate position of the ith receiver is known relative to the master jammer;
the instantaneous skew distance between the master station jams and the SAR platform is as follows:
the instantaneous slope distance between the ith receiver and the SAR platform is as follows:
the difference in distance between the receiver and the master jam
Due to the large-scale time difference of the SAR in the distance direction and the azimuth direction, according to the relative distance between different receiving stations and the SAR, at each slow time t a Respectively estimating the positions of the SAR platforms, and locking the SAR at the correct position;
AT s ＝K-R d ||T s ||
in the formula, A is a receiver position matrix, and K and Rd are matrix constants respectively;
because only one unknown variable exists, the coordinates of the SAR platform can be accurately solved by arranging more than three receivers:
T S ＝(A T A)A T (K-R d ||T s ||)
and (3) performing radar signal delay compensation by utilizing the resolved position information to generate a deception jamming signal:
compared with the prior art, the invention has the beneficial effects that:
according to the method, firstly, the camouflage interference time interval is calculated by combining topographic information, a target background template is established according to the existing radar image information, the interference information of a false target is generated by adopting a scattering distribution increment mode, and finally, the interference information is modulated into radar signals to be transmitted by adopting a distributed networking interference mode, so that the problems of error accumulation and the like caused by respectively estimating SAR motion parameters and signal parameters are solved, and the fidelity and the timeliness of electromagnetic camouflage are improved.
Drawings
FIG. 1 is a block diagram of a false target electromagnetic signal generation process based on scattering distribution increment according to the present invention;
FIG. 2 is a schematic diagram of a distributed networking architecture of the present invention;
fig. 3 is a block diagram of a process of generating an interference disguised signal by performing distributed networking according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, 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 invention.
Examples
Referring to fig. 1-3, the present invention provides a technical solution: an active electronic camouflage interference method for resisting spaceborne SAR reconnaissance is characterized by comprising the following specific steps:
s1, electromagnetic camouflage time interval calculation considering terrain information: reading the central position of the target area and peripheral DEM model data, and then calculating to obtain the set duration of the disguised time;
s2, generating false target electromagnetic signals based on the scattering distribution increment: performing down-conversion processing on the signal through a radar signal receiver, performing subsequent processing, and performing up-conversion to obtain carrier frequency for retransmission;
s3, carrying out distributed networking interference: the method comprises the steps of adopting an interference machine as a main site of a transceiver, additionally arranging a plurality of receivers as auxiliary sites for receiving radar signals, carrying out down-conversion processing on the received SAR signals, then carrying out processing camouflage on the SAR signals, finally carrying out up-conversion processing and transmitting.
Specifically, the specific operation of step S1 is as follows:
step S101, reading the central position and peripheral DEM model data of a target area, calculating the altitude angle between the highest point of the ground object and the target area under different azimuth angles, and taking the value as a terrain cut-off altitude threshold value;
s102, dynamically setting satellite orbit parameters and a sensor imaging angle range by using autonomous development software, and acquiring instantaneous geometric information between a satellite and a target;
s103, comparing whether the instantaneous altitude between the satellite and the target simultaneously meets the imaging angle of the sensor and a terrain cutoff altitude threshold, calculating critical time meeting altitude angle conditions in a linear interpolation mode, and calculating radar imaging effective duration of a target area by using the critical time;
and step S104, calculating the camouflage time setting, and performing electromagnetic signal camouflage according to the satellite overhead effective time.
Specifically, the specific operation of step S2 is as follows:
step S201, performing down-conversion processing on a radar signal receiver, sampling by an analog-to-digital converter, storing in a digital radio frequency memory, correcting according to the energy of a target radar detection unit and a detection radar detection unit by using the existing radar image data, correcting and modulating the radar energy according to the processing gain and loss parameters of a radar system, using the radar energy as a background scene, and selecting a target template from a target template library;
step S202, carrying out texture synthesis on the template target and the background scene by using a texture synthesis technology, and carrying out amplitude adjustment according to parameters such as radar system gain to generate a virtual background. Calculating a backscattering coefficient difference value between a real scene and a virtual scene target according to a virtual background, wherein obvious edge traces are easy to appear at the edge part between the virtual target and the real scene, so that smooth attenuation processing is adopted, two smooth transition functions are utilized from left to right and from top to bottom respectively, one is an attenuation function and the other is an increasing function, and effective background fusion is carried out in a boundary area to obtain target background characteristic parameters after edge processing;
step S203, simultaneously, calculating a shadow area of a real target, obtaining a modulation item which has no relation with the azimuth fast time according to the shadow point position and the backscattering coefficient of the superposed background, carrying out azimuth modulation on the signal, and weighting and summing to obtain an interference signal characteristic parameter;
step S204, processing each intercepted pulse sample by using a programmable target integrated circuit, performing time delay processing, and modulating a modulator by using a series of complex distances to generate an electromagnetic signal of a camouflage background;
step S205, converting the digital signal into an analog signal by using a digital-to-analog converter, and performing up-conversion to obtain a carrier frequency for retransmission.
Specifically, the specific operation method of step S3 is as follows:
with O jam Establishing an interference scene coordinate system parallel to a radar platform coordinate system as a center, wherein a triangle is an interference machine auxiliary site and is used for intercepting SAR signals, a blue dotted line is a real motion track of the SAR platform, and each time t of the SAR platform is a The coordinates of (a) are:
T s (t a )＝(u s ，v s ，w s ) T
suppose there are N secondary sites, using rec i Is expressed as coordinates of
rec i ＝(u i ，v i ，w i ) T
Wherein i represents the ith receiver, and the coordinate position of the ith receiver is known relative to the master jammer;
the instantaneous slope distance between the master station jammer jam and the SAR platform is as follows:
the instantaneous slope distance between the ith receiver and the SAR platform is as follows:
the difference in distance between the receiver and the master jam
Due to the large-scale time difference of the SAR in the distance direction and the azimuth direction, according to the relative distance between different receiving stations and the SAR, at each slow time t a Respectively estimating the positions of the SAR platforms, and locking the SAR at the correct position;
AT s ＝K-R d ||T s ||
in the formula, A is a receiver position matrix, and K and Rd are matrix constants respectively;
because only one unknown variable exists, the coordinates of the SAR platform can be accurately solved by arranging more than three receivers:
T S ＝(A T A)A T (K-R d ||T s ||)
and (3) performing radar signal delay compensation by utilizing the resolved position information to generate a deception jamming signal:
although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. An active electronic camouflage interference method for resisting satellite-borne SAR reconnaissance is characterized by comprising the following specific steps:
s1, electromagnetic camouflage time interval calculation considering terrain information: reading the central position of the target area and peripheral DEM model data, and then calculating to obtain the set duration of the disguising time;
s2, generating false target electromagnetic signals based on the scattering distribution increment: performing down-conversion processing on the signal through a radar signal receiver, performing subsequent processing, and performing up-conversion to obtain carrier frequency for retransmission;
s3, carrying out distributed networking interference: the method comprises the steps of adopting an interference machine as a main site of a transceiver, additionally arranging a plurality of receivers as auxiliary sites for receiving radar signals, carrying out down-conversion processing on the received SAR signals, then carrying out processing camouflage on the SAR signals, finally carrying out up-conversion processing and transmitting.
2. The active electronic camouflage interference method for resisting spaceborne SAR reconnaissance as claimed in claim 1, wherein: the specific operation of step S1 is as follows:
step S101, reading the central position of a target area and peripheral DEM model data, calculating the altitude angle between the highest point of a ground object and the target area under different azimuth angles, and taking the value as a terrain cut-off altitude threshold value;
s102, dynamically setting satellite orbit parameters and a sensor imaging angle range by using autonomous development software, and acquiring instantaneous geometric information between a satellite and a target;
s103, comparing whether the instantaneous altitude between the satellite and the target simultaneously meets the imaging angle of the sensor and a terrain cutoff altitude threshold, calculating critical time meeting altitude angle conditions in a linear interpolation mode, and calculating radar imaging effective duration of a target area by using the critical time;
and step S104, calculating the camouflage time setting, and performing electromagnetic signal camouflage according to the satellite overhead effective time.
3. The active electronic camouflage interference method for resisting spaceborne SAR reconnaissance is characterized in that: the specific operation of step S2 is as follows:
step S201, performing down-conversion processing on a radar signal receiver, sampling by an analog-to-digital converter, storing in a digital radio frequency memory, correcting according to the energy of a target radar detection unit and a detection radar detection unit by using the existing radar image data, correcting and modulating the radar energy according to the processing gain and loss parameters of a radar system, using the radar energy as a background scene, and selecting a target template from a target template library;
step S202, carrying out texture synthesis on the template target and the background scene by using a texture synthesis technology, and carrying out amplitude adjustment according to parameters such as radar system gain to generate a virtual background. Calculating a backscattering coefficient difference value between a real scene and a virtual scene target according to a virtual background, wherein obvious edge traces are easy to appear at the edge part between the virtual target and the real scene, so that smooth attenuation processing is adopted, two smooth transition functions are utilized from left to right and from top to bottom respectively, one is an attenuation function and the other is an increasing function, and effective background fusion is carried out in a boundary area to obtain target background characteristic parameters after edge processing;
step S203, simultaneously, calculating a shadow area of a real target, obtaining a modulation item which has no relation with the azimuth fast time according to the shadow point position and the backscattering coefficient of the superposed background, carrying out azimuth modulation on the signal, and weighting and summing to obtain an interference signal characteristic parameter;
step S204, processing each intercepted pulse sample by using a programmable target integrated circuit, performing time delay processing, and modulating a modulator by using a series of complex distances to generate an electromagnetic signal of a camouflage background;
step S205, converting the digital signal into an analog signal by using a digital-to-analog converter, and performing up-conversion to obtain a carrier frequency for retransmission.
4. The active electronic camouflage interference method for resisting spaceborne SAR reconnaissance as claimed in claim 1, wherein: the specific operation method of step S3 is as follows:
with O jam Establishing an interference scene coordinate system parallel to a radar platform coordinate system for the center, wherein a triangle is an interference machine auxiliary site and is used for intercepting SAR signals, a blue dotted line is a real motion track of the SAR platform, and each time t of the SAR platform a The coordinates of (a) are:
T s (t a )＝(u s ，v s ，w s ) T
in the formula, Ts represents a coordinate vector, u s 、v s 、w s The coordinate components are respectively corresponding to the jammers in the platform coordinate system, and T represents the transposition operation of the coordinate vector.
Suppose there are N secondary sites, using rec i Is expressed as coordinates of
rec i ＝(u i ，v i ，w i ) T
Where i denotes the ith receiver, u s 、v s 、w s Respectively, coordinate components corresponding to the jammers in a platform coordinate system, wherein the coordinate positions of the coordinate components are known relative to the master station jammer;
the instantaneous skew distance between the master station jams and the SAR platform is as follows:
the instantaneous slope distance between the ith receiver and the SAR platform is as follows:
the difference in distance between the receiver and the master jam
Due to the large-scale time difference of the SAR in the distance direction and the azimuth direction, according to the relative distance between different receiving stations and the SAR, at each slow time t a Respectively estimating the positions of the SAR platforms, and locking the SAR at the correct position;
AT s ＝K-R d ||T s ||
wherein A is the receiver position matrix, K and R d Are matrix constants respectively;
because only one unknown variable exists, the coordinates of the SAR platform can be accurately solved by arranging more than three receivers:
T S ＝(A T A)A T (K-R d ||T s ||)
and (3) performing radar signal delay compensation by utilizing the resolved position information to generate a deception jamming signal:
in the formula, h (t) r ,t a ) Indicating a spoof signal, t r For radar pulse fast time, t a Radar pulse slow time, delta r is instantaneous slope distance to be compensated by radar, sigma is convolution operator of radar signal, u F 、v F 、w F C is the coordinate of the jammer in the radar platform coordinate system, f is the speed of light c For the radar signal carrier frequency, exp (-) represents the phase term.
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| CN116668950B (en) * | 2023-07-31 | 2023-10-20 | 中微智创(北京)软件技术有限公司 | Target object transferring method and device and nonvolatile storage medium |
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