单双站合成孔径雷达成像回波等效变换误差分析

Equivalent transformation error analysis for monostatic-bistatic SAR echo

双站合成孔径雷达(Synthetic Aperture Radar,SAR)的回波距离历程比单站SAR复杂,导致双站SAR的Chirp Scaling算法的三个成像因子的推导困难,计算量大.现在的诸多双站SAR处理方法是针对双站SAR回波特性进行处理,文中通过双站SAR距离历程变换和引入收发双站速度比因子,将双站SAR回波等效为单站SAR回波进行处理,并对等效误差在双站SAR平飞移不变模式和移变模式下进行了分析,为双站SAR成像等效变换处理的参数选取提供了指导.

The range history of bistatic synthetic aperture radar（SAR）echo is more complicated than the monostatic case,which increases the difficulty of educing the three imaging factors in chirp scaling algorithm.At present,most of the bistatic SAR processing method processes the bistatic SAR echo according to the bistatic characteristic,but this paper processes the bistatic SAR echo as monostatic SAR echo through transfering the bistatic range course into monostatic range course and introducing the bistatic speed ratio.Further more,it analyzes the error of the method of processing bistatic SAR echo as monostatic case under the situation of transational invariant mode and transational variant mode,which provides the guideness for choosing parameters during SAR imaging process.