利用少量控制点的星载分布式InSAR定位精度提升方法

Method for Improving Positioning Accuracy of Spaceborne Distributed InSAR with Few Ground Control Points

针对如何利用少量控制点提高星载分布式干涉合成孔径雷达定位精度的问题,提出了以双基成像算法为基础,利用少量控制点标定斜距测量误差和成像多普勒中心频率提升系统定位精度的方案,进行了无控制点与少量控制点校正下的定位精度对比实验。实验结果表明,利用单个地面控制点可校正斜距测量误差和多普勒中心频率,提高一定区域内系统定位的精度。

Based on the bistatic imaging model,a method,in which the slant distance measurement error and imaging Doppler centroid frequency are calibrated with few ground control points is proposed to improve the positioning accuracy of spaceborne distributed InSAR.The satellite interference images are used to compare the positioning accuracy experiments after correcting the slant distance measurement error and Doppler centroid frequency without or with few ground control points.The experimental results show that the slant distance measurement error and Doppler centroid frequency can be corrected with a single ground control point to improve the system positioning accuracy in a certain area.