一种基于网格的卫星访问区域目标的时间窗口快速计算方法

An Efficient Method for Time Window of Satellite Access Area Target Based on Subdivision Grids

卫星访问目标的时间窗口计算在卫星任务规划调度中具有重要作用。传统方法计算过程没有存储卫星地面覆盖信息,导致计算卫星访问区域目标时间窗口的过程需要实时、重复计算卫星覆盖,导致耗时严重。因此,本文提出一种适用于卫星访问区域目标的时间窗口快速计算方法。该方法将区域目标时间窗口计算分离成两个异步过程:在预存储阶段,依托Geo SOT全球剖分参考框架,把卫星覆盖区域提前计算、量化至网格中,附上相应的时间编码,存储至数据库中;在目标分析阶段,将卫星对区域目标的时间窗口复杂计算过程转化成遍历边界网格的覆盖网格检索过程,快速获取区域目标的时间窗口。仿真实验证明,该方法时间效率与传统的跟踪传播法有较明显的提升,同时面向大范围、形状复杂的区域目标分析仍有较高的结果精度。该方法具有覆盖信息 "一次存储、反复查询"的技术优势,可为多星联合快速调度分析提供技术支撑。

Satellite access analysis plays a very important role in satellite mission planning and satellite scheduling.The time window calculation process of area targets with large area or irregular shapes becomes more difficultly.This paper aims to present an efficient analysis method that can be applied to arbitrary ground area targets.This method separates the area target time window calculation access analysis into two asynchronous processes:in the pre-processing process,based on the GeoSOT reference frame,the satellite coverage area is calculated and quantified into GeoSOT grids;and the corresponding time code is attached and stored in the database.In the target analysis process,combined with the advantages of methods based on boundary line segments,the complex calculation of the time window to the area target is transformed into a new process which is composed of database querying of boundary grids,time code collection and generation of the time window of area target.Simulation experiments show that the time efficiency of this method is significantly improved compared with the traditional tracking propagation method,and meanwhile it has also high accuracy for large-area,complex-shaped regional target analysis.The method has the technical advantage of covering information"one-time storage and repeated query",and can provide technical support for multi-satellite joint rapid dispatch analysis.