面向运动目标捕获的低轨卫星视场幅宽研究

Study of LEO Satellite Field-of-view for Moving Target Capturing

通常低轨卫星过顶时间较短,而目标运动随机,因此捕获运动目标是较为困难的,只能通过长期的时间累计来提升捕获概率。文章基于目标运动速度、出动频率、全球分布位置,卫星工作寿命、视场幅宽、轨道重访频次和时长等复杂因素,给出了卫星过顶遭遇目标的概率计算方法。然后根据概率计算结果,提出了实现0.99的遭遇概率要求卫星视场幅宽的下限。研究结果可为论证面向运动目标探测的低轨卫星视场幅宽需求提供借鉴。

It is difficult for LEO satellites,whose overpass time duration is generally short,to capture randomly moving targets.Hence the capturing probability can be raised only by longer temporal accumulation.Based on complex factors such as moving targets’velocity,dispatch frequency,location in the world,satellite's work life,field-of-view,revisiting frequency and revisiting duration,the algorithm for calculating capturing probability is given in current study.The lower bound for satellite field-of-view is given in order to reach capturing probability of 0.99,which helps to solve the issue of LEO satellite Field-of-view needed for capturing moving targets.