适于大斜视角的星载双基地SAR波数域成像算法

A Wavenumber Domain Algorithm for Spaceborne Bistatic SAR Imaging with Large Squint Angle

本文提出一种星载双基地SAR(SyntheticApertureRadar)等效平行轨迹距离模型,计算表明该模型误差远远小于直接基于多普勒参数的二阶距离模型.基于该距离模型提出一种星载双基地SAR波数域成像算法,能在大斜视角、高分辨率情况下精确成像.最后对仿真点目标双基地回波进行成像处理,结果与基于二阶距离模型的成像算法相比较,证明了本文等效距离模型和成像算法的优越性.

A parallel-track range model for spaceborne bistatic SAR is proposed,which has a much higher accuracy compared with classical two-order range model based on D oppler centroid frequency and Doppler FM rate.A wavenumber domain algorithm for spaceborne bistatic SAR imaging is then proposed based on that range model.The q uality of images of simulated bistatic echoes focused by the algorithm is much b etter than algorithm based on two-order range model at the case of large squint angle and high resolution.