卫星姿态导引对Geo-SAR观测特性影响的分析

摘要

Attitude Steering has been widely applied to the current low orbit SAR system to decrease the rang/azimuth coupling of the received data. This paper focuses on the impacts of attitude steering to the observation properties of Geo-SAR, namely, Doppler parameters, range swath, and rang cell migration effect, and a comparisonbetween 3 different ways of attitude steering is made. Based on the simulation results, the necessity of attitude steering for Geo-SAR is validated, and for Geo-SAR on elliptical orbit, 2D attitude steering is the most effective.%卫星姿态导引技术被广泛应用于现有的低轨星载 SAR 系统之中，目的在于减轻接收数据中距离/方位向耦合。该文深入分析了卫星姿态导引对地球同步轨道合成孔径雷达(Geosynchronous Synthetic Aperture Radar, Geo-SAR)的多普勒参数、测绘带宽以及距离徙动的影响，对比了 Geo-SAR 的3种姿态导引方式的效果。通过仿真验证了Geo-SAR进行姿态导引的必要性，表明了基于椭圆轨道的2维导引方法对于Geo-SAR是最有效的。