通过微分方程组数值解法计算两颗观测卫星的三维位置,在此基础上运用双星逐点交汇思路,建立定位中值估计与优化模型得到空间飞行器主动段轨道估计,并对存在的三轴指向误差进行估计,提出位置半径作为考虑系统误差下模型精度提高的判断标准. The three-dimensional position of two observing satellites is calculated by the numerical solution of differential equations. Based on this idea, the idea of ​​double point-by-point intersection is used to establish the mid-value location estimation and optimization model to obtain the orbit estimation of the spacecraft, and the existence of three-axis pointing error It is estimated that the position radius is taken as the criterion to improve the accuracy of the model considering the systematic error.