卫星编队对空间非合作目标测距相对导航精度分析

针对单颗卫星对空间非合作目标测距不能估计全部相对运动状态的问题，提出利用编队中多颗卫星同时测距相对导航。建立了相对运动状态估计的系统模型;推导了系统可观测矩阵;通过计算系统可观测度和采用无迹卡尔曼滤波（UKF）对目标相对运动状态进行估计，研究了观测矢量方向和数量与相对导航精度的关系。结果表明双星测距能估计全部相对运动状态，观测矢量夹角越大，相对导航精度越高，在编队尺寸远小于目标距离的前提下，多于两颗的卫星测距并不能明显提高相对导航精度。

Relative Guidance Accuracy Analysis for Non-cooperative Space Target by Range-only Measurement of Satellite Formation

Relative motion states of non-cooperative space target cannot be fully estimated by single satellite range-only measurement.To solve this problem,formation satellites range-only measurement was proposed.System model and measurement model were established.System observability matrix was derived,and the degree of observability was calculated.Relative motion states of non-cooperative space target were estimated through unscented Kalman filter(UKF).Analyses and simulations show that all relative motion states o...