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Airborne bistatic SAR one-transmitting-antenna and two-receiving-antenna clutter suppression method

A clutter suppression, bistatic technology, applied in the field of radar, can solve the problems such as the inability of the equivalent phase center to coincide, the clutter cannot be suppressed, etc., and achieve the effect of eliminating the influence of the transmitting station, the amount of calculation is small, and the processing is simple.

Active Publication Date: 2018-02-23
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0006] The purpose of the present invention is to address the defects in the prior art, and propose a method for suppressing clutter in one transmission and two receptions of an airborne bistatic SAR, so as to overcome the inability of the traditional DPAC method to coincide with the equivalent phase center in the airborne bistatic configuration. The problem that clutter cannot be suppressed

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  • Airborne bistatic SAR one-transmitting-antenna and two-receiving-antenna clutter suppression method

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[0044] The present invention mainly adopts the method of simulation experiment for verification, and all steps and conclusions are verified correctly on Matlab2010.

[0045] The method of the present invention solves the problem that the traditional DPCA method cannot meet the equivalent phase center alignment of the receiving-transmitting channel within a fixed time interval because the receiving and sending channels are separated, the transmitting channel and the receiving channel are located on different platforms, and the clutter is difficult to suppress. It is characterized by using the one-transmit and two-receive mode of the dual-base SAR to establish the echo model of the two-channel airborne dual-base SAR, and to derive the expression of the historical gap between the two channels. Through the phase in the echo domain and image domain respectively The compensation process eliminates this gap, so that the distance history of the static clutter of the two channels is the sa...

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Abstract

The invention discloses an airborne bistatic SAR one-transmitting-antenna and two-receiving-antenna clutter suppression method. According to the method provided by the invention, one-transmitting andtwo-receiving antenna configuration is used; first and second terms of the distance history related to azimuth and time are removed in an echo region; the influence of a transmitting station is eliminated; fixed phase compensating is carried out in an image region; a fixed distance historical error caused by different horizontal arrangement positions of two receiving antennas is eliminated; the echoes of two channels to a stationary target are exactly the same; clutter suppression is carried out after subtracting; a moving target still remains after subtracting due to the influence of the velocity; and the moving target is detected. The problem that a traditional DPCA method cannot be applied to bistatic is solved. Compared with other bistatic radar clutter suppression methods in the prior art, the method has the advantages of simpler processing and smaller computation amount, and does not need to consider the clutter distribution model of a bistatic radar.

Description

Technical field [0001] The invention belongs to the field of radar technology, and specifically relates to the detection technology of an airborne bistatic radar for ground moving targets. Background technique [0002] Synthetic Aperture Radar (SAR) is an all-weather, high-resolution microwave remote sensing imaging radar, which uses the relative movement between the radar antenna and the target area to obtain high spatial resolution. At present, it is widely used in topographic surveying and mapping, disaster area detection and other fields. [0003] The Displaced Phase Center Antenna (DPCA) technology was originally proposed to compensate for the motion effect of the radar platform, and its essence is to compensate for the broadening of the clutter spectrum caused by the motion of the radar platform. The traditional DPCA method uses two shifted phase centers. The front antenna transmits and receives the first pulse. When the rear antenna reaches the same spatial position, the ne...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/36G01S7/02
CPCG01S7/023G01S7/36
Inventor 李中余陆璐胥遇时刘竹天武俊杰黄钰林杨海光杨建宇
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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