合成孔径雷达卫星定位误差源分析

根据合成孔径雷达（ＳＡＲ）星等斜距民我普勒频移的曲线相交和扁椭圆地球模型、多普勒频率漂移与卫星至目标斜距联立方且的解，详细阐述了ＳＡＲ星地面目标图像像定位原理。着重分析了平台星历、回波时延、目标高度、多普勒中心频率和时钟等误差与定位精度的关系，最后举例说明误差源的属性。

PRIMARY ANALYSIS OF LOCATION ERROR SOURCES SYNTHETIC APERTURE RADAR SATELLITE

This paper describes the location philosophy of SAR satellite ground target image pixel in detail, from the curve intersection of the SAR satellite equivalent slant range circle with Doppler frequency shift, and from the coupled equations solve of oblate ellipsoid earth model, Doppler frequency shift and satellite to target slant range in the geocentric coordinate, respectively. The emphasis is given on analysis to relationship of error sources to location accuracy on platform ephemeris, echo time delays, target elevation, Doppler center frequency and time clock etc. At last, the quality of error sources are described by example.