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

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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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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