分布式星载干涉SAR基线设计与性能分析

Baseline Design and Performance Analysis for Distributed Spaceborne Interferometric Synthetic Aperture Radar

基于线性化开普勒方程给出了分布式SAR卫星的轨道要素计算公式 ,分析了分布式星载干涉SAR的高程测量精度、速度测量精度以及改善空间分辨率的性能指标 ,建立了分布式SAR卫星的空间几何模型 ,结合编队构形设计进行了极限基线分析 ;在此基础上提出了一种通用的三维编队飞行分布式星载干涉SAR基线设计方法 .基于L波段分布式SAR卫星进行了编队轨道参数设计 ,给出了干涉基线的仿真结果 。

Basing on linearized Kepler equation, the formula of formation flying orbit parameters is induced. The performance analysis formulas for spaceborne distributed InSAR system are explored, which give the measurement precision of height and velocity and the refinement of space resolution. According to the critical baseline analysis and the formation configuration design, a baseline design technique is proposed, which is applicable for the distributed spaceborne InSAR systems with general three dimensional formation flying orbit. Computer simulation results for the interferometric baseline analysis are demonstrated, with the formation flying orbital prameters design for an L-band distributed spaceborne InSAR system, and the efficiency of the baseline design technique is validated by the performance analysis.