分布式InSAR基线定标算法

Baseline Calibration Algorithm for Distributed- InSAR

分布式InSAR卫星采用绕飞编队模式，因此存在顺轨、跨轨和下轨三个基线分量。由于三个基线分量之间存在较强的相关性，导致基线定标精度难以提高。本文提出了一种基于单景数据的分布式InSAR基线定标算法，通过构建局部移动坐标系、三维基线向二维基线转换等策略，建立了高精度基线定标模型。在此基础上，通过分析基线定标原理，提出了控制点沿场景两侧布设的新思路。实验结果表明，本文提出的算法能够实现毫米级的InSAR基线定标精度。

Since distributed - InSAR satellites use the flying - around formation mode, there exist three baseline components, namely along - track, across - track and down - track. Considering that there is a comparatively strong correlation among these components, it is difficult to improve the calibration accuracy. A baseline calibration algorithm for distributed - InSAR based on single scene data is proposed in this paper. By constructing local mobile coordinate system and adopting strategies like transforming three -dimension baseline into two -dimension one and so on, a high accuracy calibration model is set up. On the basis of the model, a new idea that ground control points are laid at different sides in a single scene is put forward. The experiment result shows that the algorithm can achieve a millimeter - level accuracy of InSAR baseline calibration.