星载双站SAR“停走停”假设误差分析

Error analysis of “stop and go” hypothesis of spaceborne bistatic SAR

针对星载双站合成孔径雷达,研究“停走停”假设带来的斜距误差,基于星载SAR等效斜视距离模型,分析得到该斜距误差可以近似等效为合成孔径慢时间的一次函数形式。据此定量分析该斜距误差对成像和干涉处理的影响。给出以卫星位置、速度和加速度表示的等效斜距误差计算公式,最后进行仿真验证。

For a spaceborne bistatic SAR （synthetic aperture radar） system, the range error produced by ＂stop and go＂ hypothesis is analyzed in this paper. Based on the effective squint range model of spaceborne SAR, the range error may be equivalent to linear function of azimuth time. The effect of range error on imaging and interferometric processing is discussed quantificationally. A formula of effective range error in the form of position, velocity and acceleration parameters of satellites is presented. The simulation results are shown to demonstrate the efficiency of the method presented.