摘要
SAR干涉(InSAR)测高是分布式卫星目前一个重要的应用方向。星间基线是系统高程理论精度的决定性因素之一,而基线是由编队构形决定的,因此构形设计是InSAR测高分布式小卫星系统顶层设计的一个关键内容。针对设计变量与目标函数之间的关系非常复杂,没有简单明确的解析形式的特点,选择遗传算法作为优化算法进行构形的优化设计,给出了编码方法和适应度函数。以典型雷达卫星参数为初始条件,对几种不同构形进行了仿真,结果表明在一个轨道周期内,双星空间编队约有一半时间能够满足精度优于1m的要求,是进行InSAR测高的首选构形。
Height Measurement is an important aspect of the application of distributed satellites. Inter-satellites baseline is one of factors to determine the measurement accuracy, while baseline is determined by the formation. So formation design is a key technique in the integrated design of InSAR system. According to the complicated relationship between design variables and object functions that has no simple analytical forms, genetic algorithm is chosen to design the optimal formation. The coding rule and the sufficiency function are given. Several formations are simulated based on a set of parameters of typical radar satellite. The result indicates that the 2-sat non-plane formation is an appropriate formation for the height measurement of InSAR, because it can provide baseline to guarantee the 1m accuracy of the measurement in a half time of the whole orbit.
出处
《宇航学报》
EI
CAS
CSCD
北大核心
2006年第4期654-658,669,共6页
Journal of Astronautics
关键词
SAR干涉测高
编队构形
优化设计
遗传算法
Height measurement of inSAR
Formation
Optimized design
Genetic algorithm
