一种面向成像任务规划的光学遥感卫星成像窗口快速预报方法

A Fast Algorithm for Imaging Time Window Prediction of Optical Satellites Considering J_2 Perturbation for Imaging Mission Scheduling

针对光学卫星任务调度系统对成像时间窗口预报算法精度和复杂度的需求,提出了一种顾及J2长期项摄动的光学遥感卫星成像窗口预报算法。使用"特征圆锥"判断是否满足成像条件,将成像条件方程改写为关于偏近地点角的超越方程;采用基于"目标纬圈"的初值选择方法和星下点轨迹周期性漂移的初值过滤方法,保证了条件方程的可解。实验结果表明,此算法能在降低计算量的同时保证预报算法的精度。

A fast algorithm for imaging time window prediction of optical satellites consider- ing the J2 Perturbation was represented. An imaging condition equation about eccentric anomaly is drawn based on a simplified feature cone model. In order to solve the transcen- dental equation by Newton iteration, a hybrid method for initial value selection was presen- ted in detail. A latitude circle was exploited to potential initial acquisition, and the character- istic of periodic drift of sub-satellite point was utilized for the initial value filtering. The ex- perimental results show feasibility of the proposed method.