MOVING TARGET DETECTION AND MOTION PARAMETER ESTIMATION VIA DUAL-BEAM INTERFEROMETRIC SAR

It's difficult to detect and estimate parameters for the slow moving target in clutter using conventional methods. To solve the problem, this paper proposes a method based on dual beam interferometer SAR imaging mode(DBI). The moving target can be detected by the azimuth offset caused by the time delay of the forward-looking and backward-looking beams. The clutter is suppressed by displace phase center antenna (DPCA) after back projection(BP)algorithm. Then the radial velocity of the moving target can be obtained by the interferometric processing technology. Finally, using the azimuth pixel offset in the image to estimate the azimuth velocity of the slow moving target. With this method, the detection and velocity estimation of the slow moving target can be realized after good clutter cancellation. This method is suitable for the slow-moving and the micro-moving target in clutter, which is hardly possible for conventional SAR. Besides it is not limited by the conventional DPCA condition. The effectiveness of the proposed method is validated by the simulation.