卫星编队InSAR基线的确定方法

Technique of Determining Base-Line for InSAR Based on Formation-flying Satellites

基于卫星编队的InSAR系统是一个多基雷达系统,依靠卫星编队构型形成干涉所需的基线。在卫星编队的InSAR系统中,由于参与编队的各卫星相对位置不断变化,故其基线值也在不断变化。在动态变化中基线测量所得的基线一般是某一时刻两颗卫星雷达天线相位中心之间的连线,不能直接用于高程测量,需要对基线重新进行确定。本文在分析了需要基线确定原因的基础上,提出了基线确定的方法,并分析了基线误差对InSAR高程测量精度的影响。

Interferometric Synthetic Aperture Radar （InSAR） is a method which may provide a means of estimating global topography with high spatial resolution and height accuracy. In the InSAR system based on formation-flying satellites, because the relative position of each satellite participated in formation moves continuously, the baseline also changes. In the dynamic change, the baseline coming from the baseline measure is the line of phase center of two satellite radar antennas sometime, and can not be directly used in ＂the height measure, so the baseline must be determined over again. In this paper, on the basis of ana-lyzing the reasons of the baseline determination, the methods of the baseline determination were brought forward, and the influ-ence on the accuracy of baseline error to/nSAR height measure was analyzed.