一种改进的卫星星座服务可用性评价方法

针对存在缺失卫星的轨道面,将星座中的卫星分为两组,从概率角度并采用组合方法提出了星座覆盖可用性和导航精度可用性指标的统计评价模型和仿真流程,进而通过对两项可用性指标进行加权建立了形式统一的服务可用性加权评价模型。利用该模型对单个或多个轨道面有确定数量卫星缺失的状态下,星座构型和轨道参数变化对其服务可用性的影响进行了研究。结果表明,星座轨道平面数和轨道高度均对服务可用性有较大影响。提出的服务可用性评价模型物理意义明确,可有效减少指标评价时间,研究结论有助于在概念设计阶段对星座构型和轨道参数进行优选。

Improved Evaluation Method of Service Availability for Satellite Constellation

A weighted statistical evaluation model and corresponding simulation flow for evaluating the figure of merit of constellation service availability were suggested by dividing the satellite constellation into two groups according to whether the satellites in the orbital planes having fault satellite and by using probability and combination method.Using this model and simulation flow,an univariate study on the effects of variation of constellation configuration and orbital parameters on its service availabilities(SA) was performed.The results indicated that the number of orbit plane,relative phase factor and orbital height of the constellation have effect on its service availabilities.The proposed model has explicit physical meaning and can greatly reduces the evaluation time of SA merits.And the conclusions can help to select the optimal constellation configuration and orbital parameters in conceptual design phase.