双星编队对空间非合作目标的仅测角跟踪方法

针对单星仅测角对目标跟踪误差较大和不良测量条件下跟踪精度下降的问题，提出利用编队卫星对非合作目标进行联合跟踪的方法。采用考虑地球非球形J2引力摄动的轨道动力学模型，建立多视线测量模型，融合编队卫星对目标的观测数据。然后，基于新息设计增益调节矩阵提高滤波器在测量故障条件下的鲁棒性。最后，建立仿真模型进行验证。仿真结果表明，相比单星跟踪，该方法的位置误差和速度误差分别减少了27.06%和26.96%。在系统存在异常量测时，相比常规滤波，该方法也具有更高的精确性和更好的鲁棒性。

Two Satellites Formation for Non-cooperative Space Target Tracking Using Bearings-only Measurements

The single satellite for non-cooperative space target tracking using bearing-only measurements has a poor tracking precision, and the tracking precision decreases in the situation of measurement faults. In order to solve this problem, two satellites formation for non-cooperative space target(NCST) integrated tracking is proposed. The orbit dynamic model which takes the J2 perturbation into consideration is introduced, the multiple line-of-sight measurements model is built, and the measurements of NCST using satellite formation are fused. Then, the gain adjustment matrix based on innovation is designed to improve the robustness of filter to measurement malfunctions. Finally, the simulation model is established. The simulation results show that the position error and velocity error of this method are reduced by 27.06% and 26.96% respectively compared with single-satellite tracking. This method has the higher precision and stronger robustness than traditional filter in the abnormal measurement conditions.