基于Bakhshali近似的星载双站SAR成像方法

Spaceborne bistatic SAR imaging method based on Bakhshali approximation

随着卫星技术的发展与成熟,星载分布式SAR和中高轨SAR越来越受到关注,但是其较长的合成孔径时间和大基线距对双站SAR成像提出了新的要求。基于单站等效思路,提出一种基于Bakhshali近似的双曲等效方法,设计了适用于该方法的CS成像流程。与基于泰勒二阶近似的双曲等效方法相比,该方法满足长合成孔径时间和基线距变化较大的情况下的成像要求。最后通过星载双站SAR的仿真实验验证了该方法的有效性。

Distributed spaceborne SAR and medium-or high-orbit SAR are receiving increasing focus with the development of satellite technology,while the extended synthetic aperture length and long baseline pose new challenges to the bistatic SAR imaging. In this work we propose a new hyperbolic equivalence method based on Bakhshali approximation. Besides,an appropriate CS imaging procedure is designed. Compared to the original method,the proposed method meets the requirements. Finally,the simulation results verify the validity of the proposed method.