混合坐标系下空间目标天基光学跟踪方法研究

Study on Space Object Tracking using Space-based Optical Sensor in Hybrid Coordinates

在对天基光学监视跟踪特点进行分析基础上,利用直角坐标系和修正极坐标系分别在状态外推和线性测量更新方面具有的优势,采用混合坐标系下的扩展卡尔曼滤波方法实现对空间目标的三维被动跟踪,并给出相应初始化方法。仿真结果表明该方法与直角坐标系跟踪滤波具有一致的收敛趋势,并在收敛速度和稳健性上更有优势。

Based on the analysis on the characteristics of the space optical surveillance and tracking, and considering the advantages of the Cartesian coordinate on state extrapolation and the modified polar coordinate on linear measurements innovation respectively, the extend Kalman filter in hybrid coordinates is adopted to realize the tracking of space objects. And the corresponding tracking initiation is also given. Simulation results indicate that this approach has the same convergence trend as that in Cartesian coordinate, and has more advantage on rapidity on convergence and stability.