面向全球快速重访的限制性Walker星座设计方法

Design method of restricted Walker constellation for global rapid revisit

自然灾害、军事冲突等突发热点事件的发生地点往往具有随机性,因此需要在全球范围内提高具有侦察、探测等具体任务背景的稀疏星座的快速重访能力。基于限制性Walker星座的概念,即通过将轨道面升交点赤经均匀分布的范围限制在特定的数值区间内,对常规Walker星座进行改造,提出一种能实现全球范围内快速重访的星座设计方法。以最大时间分辨率最小化为优化目标设计优化问题,借助差分进化算法求解最优限制性Walker星座构型。仿真结果表明,所提方法所得到的限制性Walker星座,在不连续覆盖性能方面优于常规的Walker星座以及已有文献所提出的星座。

The occurrence of hot spot events such as natural disasters and military conflicts often exhibits randomness in terms of location.Therefore,it is necessary to enhance the rapid revisit capability of sparse constellations with specific task backgrounds,such as reconnaissance and detection,on a global scale.Based on the concept of restricted Walker constellation,which constrains the range of right ascension of ascending nodes uniformly distributed within specific numerical intervals.The conventional walker constellation is reconstructed and a design method for constellation is proposed to achieve rapid revisit capability on a global scale.Then the optimization problem is designed with the maximum time resolution minimization as the optimization objective,and the optimal restricted Walker constellation configuration is solved by differential evolution algorithm.Simulation results show that the restricted Walker constellation designed by the proposed method is superior to the conventional Walker constellation and the constellation proposed in the existing literature in terms of discontinuous coverage performance.