卫星对区域目标的时间窗口快速计算方法

Fast Predicting Algorithm for Satellites Time Windows to Ground Area Target

为了提高卫星对区域目标时间窗口的计算效率,并兼顾结果的精确性,提出一种基于迭代修正的时间窗口计算方法。利用问题特性将卫星对区域的时间窗口计算化为对区域每条边界的时间窗口计算,首先在不考虑地球自转下得到每条边界的时间窗口,然后根据地球自转特征对计算结果进行迭代修正,最后对所有的边界的时间窗口进行综合得到区域目标时间窗口。该算法充分利用卫星轨道的基本特性,实现了对区域目标时间窗口的快速和精确计算。数值计算结果表明,改进算法计算效率高,计算结果精确。

To improve the efficiency of satellites time windows to ground area target, and consider the accuracy of the result, a time window calculation method was put forward using iterative correction. Using the characteristic of this problem, the calculation of time windows to ground area target was turned into that of the time windows to each boundary of the area target. Firstly, we calculated the time window of each boundary of the area target without consid- ering the rotation of the earth, and then corrected the calculation result according to the characteristics of the earth＇s rotation. At last, we got time window of the area by the time window of all boundaries. This algorithm makes full use of the basic characteristic of satellite orbit, and achieves the goal of calculation of satellites time windows to ground area target for quick and accurate calculation. The simulation results show that this algorithm has high efficiency and accurate result.