Abstract
A long aperture time is required to achieve a high signal-to-noise ratio and high azimuth resolution in geosynchronous spaceborne-airborne bistatic synthetic aperture radar (GEO SA-BSAR) system for moving target indication (MTI). The range walk migration because of the target's motion cannot be ignored for such a long time, and the second-order range model fails for the moving target. In this paper, an adaptive MTI method is proposed for GEO SA-BSAR with a long aperture time, ensuring the moving target's detection and location. Firstly, an adaptive spatial filter modified by the accurate GEO SA-BSAR multichannel signal model is applied to clutter suppression and beamforming. Next, we adopt the generalized Radon-Fourier transform to maximize the signal-to-noise ratio of the moving target with unknown motion parameters. Then, the moving target can be detected, and its position has been obtained. Finally, the simulation experiments are conducted to show the effectiveness of our technique.
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