空间飞行器FADS系统算法及奇异值分析

嵌入式大气数据传感(FADS)系统依靠飞行器前端的压力传感器间接得到飞行大气数据。简要介绍了FADS系统的压力模型,针对最小二乘法迭代稳定性差的缺点,给出了求解大气数据迎角和侧滑角的三点法。对三点法求解过程中出现的奇异值问题采用分类分析法进行分析,并给出各组合间优势互补的解决方案。仿真结果表明奇异值分析结果和解决方案正确可行。

Flush Airdata Sensing System Algorithm of Spacecraft and Analysis on Singularity

Flush airdata sensing system depends on the pressure sensors allocated on the forebody of spacecraft to derive airdata indirectly. First, the pressure model of FADS is showed briefly, then for solving stability problem of iteration of least squares algorithm, the way called ＂triples＂, which is used to work out the airdata including attack angle and sideslip angle, is presented. Furthermore, the singularity, occurring in the ＂triples＂, is analyzed carefully by means of sorted analysis, and an idea of solving the problem is given. The simulation result shows that the singularity analysis and the resolution is feasible.