敏捷SAR卫星星上实时任务规划设计

On-board Real-time Mission Scheduling Design of Agile SAR Satellites

面向敏捷合成孔径雷达(SAR)卫星在轨协同引导成像任务,对星上实时任务规划进行设计。考虑协同任务过程及特点,构建滚动规划结合动态重规划的星上实时任务规划运行框架,制定长规划窗口与短决策窗口滚动推进的规划-决策策略,并设计以事件触发或固定周期推进的星上实时任务规划运行过程。对运行过程中的多点目标成像规划问题,采用深度优先的树搜索算法搜索最优成像目标序列,使用冲突消解规则、收益预测规则对搜索树进行剪枝,以加快搜索速度。基于模拟引导目标数据的实时任务规划仿真结果表明:文章设计的星上实时任务规划是有效的,可满足在轨实时引导成像任务使用要求。

For cooperatively guided imaging missions,the on-board real-time mission scheduling design of agile SAR(synthetic aperture radar)satellites is proposed.According to the cooperative mission process,the basic operational framework of the on-board real-time mission scheduling,in which dynamic re-scheduling is combined with rolling scheduling,is constructed.The scheduling and decision strategy using long scheduling and short decision windows is proposed.Then the running process of the on-board real-time mission scheduling triggered by events or fixed period is designed.To solve the multi target points imaging scheduling problem,the depth-prior searching algorithm is used to achieve the optimal imaging route from the meta-mission queue.During the searching process the search tree is trimmed according to conflict resolution and profit estimation rules to reduce search subspace and save search time.Simulation results of real-time mission scheduling based on guiding targets simulation show that the on-board real-time mission scheduling scheme proposed in this paper is effective for on-orbit real-time guided imaging mission.