CN111983571B - Multidimensional composite modulation interference method for synthetic aperture radar - Google Patents
Multidimensional composite modulation interference method for synthetic aperture radar Download PDFInfo
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- CN111983571B CN111983571B CN202010689237.0A CN202010689237A CN111983571B CN 111983571 B CN111983571 B CN 111983571B CN 202010689237 A CN202010689237 A CN 202010689237A CN 111983571 B CN111983571 B CN 111983571B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/38—Jamming means, e.g. producing false echoes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/021—Auxiliary means for detecting or identifying radar signals or the like, e.g. radar jamming signals
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/89—Radar or analogous systems specially adapted for specific applications for mapping or imaging
- G01S13/90—Radar or analogous systems specially adapted for specific applications for mapping or imaging using synthetic aperture techniques, e.g. synthetic aperture radar [SAR] techniques
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Abstract
The invention provides a multi-dimensional composite modulation interference method for synthetic aperture radar, which can realize continuous distributed interference image block coverage, the interference image coverage range and the covering strength are independently controllable, and the distance advanced coverage can be generated. The invention can realize the continuously distributed surface target interference images, and breaks through the limitation that the conventional method uses point target combination to generate a point target array or a point target group; and secondly, the coverage range and the covering strength of the interference image are independently controllable.
Description
Technical Field
The invention belongs to the technical field of radar countermeasure, and particularly relates to a multi-dimensional composite modulation interference method for synthetic aperture radar.
Background
Synthetic Aperture Radar (hereinafter referred to as SAR) is carried on air and space platforms such as satellites, airplanes and unmanned aerial vehicles, can work in L, C, X, Ku and other radio frequency bands, and can perform long-distance high-resolution imaging reconnaissance on the ground all day long and all day long to obtain ground target information.
For SAR reconnaissance threats, interference by transmitting electromagnetic signals is an effective way to combat the threat. Various interference techniques have been developed in recent years. The interference signal mode can be divided into incoherent interference, partial coherent interference and coherent interference, the incoherent interference is mainly caused by various noise interferences, and the main effects of large-range noise image covering and generally uncontrollable image coverage range and intensity distribution are achieved. The coherent interference generally takes a Digital Radio Frequency Memory (DRFM) as a core, the obtained effect is a point target and a multipoint target (group) generated by copying and overlapping, the partial coherent interference generally takes the DRFM as the core, and a partial coherent method is adopted, so that the obtained effect is a diffusion point target and a diffusion multipoint target (group) generated by copying and overlapping, the image coverage range of the two types of interference has certain controllability, but an advanced false target is generally difficult to generate, the image coverage range is determined by a point target distribution boundary, the image brightness needs to be controlled point by point, and the engineering realization is inconvenient.
Disclosure of Invention
In view of this, the present invention provides a multi-dimensional complex modulation interference method for synthetic aperture radar, which can realize continuously distributed interference image block coverage, and the coverage area and the covering strength of the interference image are independently controllable, and can generate distance advanced coverage.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a multi-dimensional complex modulation interference method for synthetic aperture radar comprises the following steps:
firstly, converting an input signal from an analog domain to a digital domain to obtain a digital domain input signal;
then after carrying out multiphase filtering and orthogonal shunting on the digital domain input signal, carrying out coarse delay, copying shunting, fine delay, phase modulation, Doppler frequency modulation and copying and combining processing in sequence to obtain a combined signal;
obtaining the writing and reading time required by signal storage through coarse delay; after fine delay, controlling the distance deviation of each branch signal to the position deviation by controlling the delay time of each branch signal; through phase modulation, the interference area of each shunt signal is controlled by controlling the number of phase sections of each shunt signal; controlling the azimuth position offset of each branch signal by controlling the Doppler frequency shift amount of each branch signal through Doppler frequency modulation;
finally, power or amplitude control is carried out on the combined signal;
and converting the controlled signal from a digital domain to an analog domain to obtain an interference signal and outputting the interference signal.
Wherein the interference signal is used for interfering with a satellite-borne SAR, an airborne SAR and/or a missile-borne SAR.
The interference signal is used for interference scanning type, strip type, beam type, sliding beam type SAR working mode, interference SAR and SAR-GMTI working mode.
The distance-direction position deviation is controlled by signal delay, when the distance-direction position deviation is required to be delta r, the signal delay time is as follows:
where c is the speed of light.
Wherein, the area of the required interference region is controlled by the number of phase segments, the area of the required interference region is A, and the side length is
The number of phase segments is:
wherein Δ R is radar range resolution:
where c is the speed of light and B is the signal bandwidth.
Wherein, the azimuth position offset is controlled by the Doppler frequency shift quantity, and when the azimuth position offset is required to be Δ x, the Doppler frequency shift quantity is as follows:
wherein v is SAR flight speed, R interference distance, and lambda is SAR working wavelength.
Has the advantages that:
the invention can realize the continuously distributed surface target interference images, and breaks through the limitation that the conventional method uses point target combination to generate a point target array or a point target group; and secondly, the coverage range and the covering strength of the interference image are independently controllable.
Drawings
FIG. 1 is a flow chart of the method of the present invention.
Fig. 2 is a non-interfering SAR image of an airport and supporting facilities.
FIG. 3 is a diagram illustrating interference effects of a conventional interference method; fig. 3(a) is a schematic diagram of a point target array, and fig. 3(b) is a schematic diagram of a point target group.
FIG. 4 is a diagram illustrating the interference effect of the present invention; fig. 4(a) is a schematic diagram of a single block area target interference image, and fig. 4(b) is a schematic diagram of a multi-block area target interference image.
Detailed Description
The invention is described in detail below by way of example with reference to the accompanying drawings.
The generation process of the analysis interference signal is as follows: when the satellite-borne SAR reconnaissance the area where the interference machine is located, the signal is transmitted and the ground object target echo is received for imaging, and the interference machine receives the transmitted signal of the SAR, and transmits the interference signal to the satellite after down-conversion, signal processing, up-conversion and power amplification. In the radar interference signal generation method, analog or digital modulation methods such as amplitude modulation, frequency modulation, phase modulation and the like are applied to a certain extent, and particularly in deception interference signal generation, a typical application method is as follows: the method is characterized in that the signal delay, the Doppler and the amplitude modulation are relatively independent, the modulation parameters are not closely related, and continuously distributed surface target interference images cannot be realized.
Based on the interference method, the invention provides the interference method of the multi-dimensional complex modulation, in the process of generating the interference signal, signals such as time delay, Doppler, phase and amplitude are comprehensively applied for modulation, and the modulation parameters are closely related and uniformly controlled. The invention realizes the main signal processing in the digital domain for the multidimensional composite modulation interference of the synthetic aperture radar, the front end and the rear end are respectively provided with an analog-to-digital converter (ADC) and a digital-to-analog converter (DAC) to finish the conversion of signals from the analog domain to the digital domain and from the digital domain to the analog domain, and the flow chart of the method is shown in figure 1 and specifically comprises the following steps:
firstly, inputting an intermediate frequency input signal into an analog-to-digital converter (ADC), converting the signal from an analog domain to a digital domain, and obtaining a digital domain input signal;
and then, after multi-phase filtering and orthogonal shunting of the digital domain input signals are realized by using filtering/orthogonal transformation, coarse delay, copy shunting, fine delay, phase modulation, frequency modulation and copy combining processing are sequentially carried out.
The processing between the duplicate splitting and combining is core processing, and the splitting and combining aims to realize a plurality of independent processing channels for generating a plurality of interference areas. Obtaining the writing and reading time required by signal storage through coarse delay; after fine delay, controlling the distance deviation of each branch signal to the position deviation by controlling the delay time of each branch signal; through phase modulation, the interference area of each shunt signal is controlled by controlling the number of phase sections of each shunt signal; and controlling the azimuth position offset of each branch signal by controlling the Doppler frequency shift amount of each branch signal through Doppler frequency modulation.
And finally, after power/amplitude control is carried out, converting the signal from a digital domain to an analog domain through a digital-to-analog converter (DAC), and outputting an intermediate frequency signal. Wherein, the power/amplitude control is used for uniformly controlling the strength of the interference signal after the combination.
Specifically, the modulation parameter calculation and distribution control required for multidimensional complex modulation can be completed by a complex modulation parameter calculation and distribution module, and the close association of each modulation parameter is specifically realized by the module, as shown in table 1.
TABLE 1 close correlation Table for modulation parameters
Wherein, suppose that the signal is divided into M paths of signals, each path is independently controlled, and the main control quantity comprises distance position, azimuth position, area and the like.
The distance-direction position control is realized by signal delay, when the distance-direction position deviation is required to be delta r, the signal delay time is as follows:
wherein c is 3 × 108m/s。
The area of the required interference region is controlled by the number of phase sections, the area of the required interference region is A, and the side length is
Number of phase segments:
Δ R is the radar range resolution, Δ R being a function of the signal bandwidth B:
wherein c is the speed of light (3 × 10)8m/s)。
The control of the azimuth position is realized by Doppler frequency modulation, and when the azimuth position deviation is required to be delta x, the Doppler frequency shift quantity is as follows:
wherein v is SAR flight speed, R interference distance, and lambda is SAR working wavelength.
The interference signal generated by the invention is used for interfering satellite-borne SAR, airborne SAR and/or missile-borne SAR.
The generated interference signal is used for interference scanning type, strip type, beam type, sliding beam type SAR working mode, interference SAR and SAR-GMTI working mode.
The analytical table comparing the conventional method with the method of the present invention is shown in Table 2. Compared with the prior art, the method can realize the continuously distributed surface target interference images, and breaks through the limitation that the point target array or the point target group is generated by the point target combination in the conventional method; and secondly, the coverage range and the covering strength of the interference image are independently controllable.
TABLE 2 analysis of the comparison of conventional and inventive methods
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A multi-dimensional complex modulation interference method for synthetic aperture radar is characterized by comprising the following steps:
firstly, converting an input signal from an analog domain to a digital domain to obtain a digital domain input signal;
then after carrying out multiphase filtering and orthogonal shunting on the digital domain input signal, carrying out coarse delay, copying shunting, fine delay, phase modulation, Doppler frequency modulation and copying and combining processing in sequence to obtain a combined signal;
obtaining the writing and reading time required by signal storage through coarse delay; after fine delay, controlling the distance deviation of each branch signal to the position deviation by controlling the delay time of each branch signal; through phase modulation, the interference area of each shunt signal is controlled by controlling the number of phase sections of each shunt signal; controlling the azimuth position offset of each branch signal by controlling the Doppler frequency shift amount of each branch signal through Doppler frequency modulation;
finally, power or amplitude control is carried out on the combined signal;
and converting the controlled signal from a digital domain to an analog domain to obtain an interference signal and outputting the interference signal.
2. The method of multi-dimensional complex modulation interference with synthetic aperture radar of claim 1, wherein the interference signal is used to interfere with satellite-borne SAR, airborne SAR, and/or missile-borne SAR.
3. The multi-dimensional complex modulation interference method for synthetic aperture radar of claim 1, wherein the interference signal is used for interference scanning, banding, beamforming, sliding beamforming SAR mode of operation, interferometric SAR, and SAR-GMTI mode of operation.
4. The method of claim 1, wherein the range-to-position offset is controlled by a signal delay, and wherein the signal delay time is at Δ r for a range-to-position offset:
where c is the speed of light.
5. The multi-dimensional complex modulation interference method for synthetic aperture radar as claimed in claim 1, wherein the required interference area is controlled by the number of phase segments, the required interference area is a, and the side length is a
The number of phase segments is:
wherein Δ R is radar range resolution:
where c is the speed of light and B is the signal bandwidth.
6. The method of claim 1, wherein the azimuth position shift is controlled by a doppler shift amount, and when the azimuth position shift is required to be Δ x, the doppler shift amount is:
wherein v is SAR flight speed, R interference distance, and lambda is SAR working wavelength.
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| CN113093122B (en) * | 2021-04-01 | 2023-06-13 | 西安电子科技大学 | Method for synthesizing fast scene deception jamming of aperture radar |
| SE2100054A1 (en) * | 2021-04-21 | 2022-10-22 | Anders Widman | Method to generate cover pulse against following lines |
| CN114089291A (en) * | 2022-01-19 | 2022-02-25 | 北京宏锐星通科技有限公司 | Device for interfering synthetic aperture radar |
| CN114114169A (en) * | 2022-01-27 | 2022-03-01 | 北京宏锐星通科技有限公司 | Camouflage protective device for synthetic aperture radar |
| CN114217274B (en) * | 2022-02-22 | 2022-06-10 | 北京宏锐星通科技有限公司 | Method and device for positioning target of interference synthetic aperture radar |
| CN116520262B (en) * | 2023-06-25 | 2023-10-17 | 成都华兴汇明科技有限公司 | Radar interference signal generation method and system based on vector signal source |
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