分布式InSAR干涉基线与空间状态测量的关系分析

阐述了分布式InSAR目标三维定位原理,分析了干涉基线与空间状态测量之间的关系;给出了干涉基线的完整定义,将干涉基线分解为空间域干涉基线和时间域干涉基线,其中时间域干涉基线通过主星的绝对定轨结果获得,空间域干涉基线主要通过高精度星间相对定位结果获得;分析了卫星轨道速度、平台姿态测量、天线安装等误差对干涉基线测量精度的影响,讨论了不同基线测量体制对姿态精度的要求差异,为分布式InSAR的空间状态测量方案设计及相关测量手段精度指标的论证提供了技术支撑。

An Analysis of the Relationship Between the Distributed InSAR Interference Baseline and the Spatial States Measurement

The principle of distributed InSAR geolocation is introduced in this paper,and the relationship between the interference baseline and the spatial states measurement is analyzed.The complete definition of the interference baseline is proposed.The interference baseline is decomposed into the spatial interference baseline and the time interference baseline.The time interference baseline is obtained by a master satellite absolute orbit determination,and the spatial interference baseline is obtained by a high precision inter-satellite relative position determination.The influence of the errors of satellite orbit speed,attitude and antenna fix to the interference baseline measurement precision is analyzed.Different attitude precision requirements to the different baseline measurement techniques are discussed,which provides a technique support for the design of a disturbed InSAR spatial state measurement scheme and the analysis of the corresponding measurement precision criterions.