Abstract

Range migration of space borne SAR at large squint angle is much greater than the side-looking SAR, and longer echo receiving window is needed. Thus, the traditional beam position design method is invalid. In this paper, the method of drawing zebra map is improved by taking the range migration into consideration. The maximum and the minimum slant ranges during the synthetic time are derived. This paper also analyses the relation between the effective swath width and the range beam width at large squint angle. Simulation for X-SAR system proves that a given azimuth resolution limits the squint angle. STK and echo simulation are used to verify the validity of the improved beam position design method.

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