稳健估计在轨道改进中的应用

通过对20颗卫星的模拟计算，研究了人造卫星光学观测的轨道改进方法，给出了资料预处理(观测精度σ0=5″)的剔除门限，使野值的比例在大多数情况下小于10％；在轨道改进中，先用Huber估计迭代2次，再用Hampel估计迭代到收敛，保证了轨道改进的精度；重点研究了Hampel估计的权函数参数(C0，C1，C2)的取值，得出结论：对于大于或等于6σ0的野值，C0可取为2．2，C1可取为3．6，C2的取值和野值大小有关．

A Robust Estimation Method for Orbit Determination

The method of orbit improvement is studied through processing the simulated optical data of 20 satellites. The criterion of deletion makes the ratio of outliers to be less than 10% in most cases. After using Huber estimation twice, Hampel estimation is used to get the result when it converges. This method ensures the accuracy of orbit. The parameter C0, C1 and C2 of Hampel estimation are deeply studied, and the result is: C0=2.2, C1=3.6, C2 changes with the value of single outliers.