摘要
卫星导航的星座可用性是评价导航系统性能的重要指标之一。基于马尔可夫过程建立了同时考虑卫星故障率和修复率的单星可用性模型,结合卫星的备份情况提出了空间信号层和服务层的星座可用性评估方法模型。基于上述评估模型,结合大量实测数据分析了空间信号层和服务层的星座可用性概率。结果表明:全球定位系统(global positioning system,GPS)星座可用性评估模型是有效的,GPS星座可用性符合其系统性能规范。提出的星座可用性评估方法对北斗卫星导航系统的全球化建设及其可用性评估有一定的参考价值。
The constellation availability of satellite navigation system is one of the important indexes when evaluating the satellite navigation system performance. The satellite availability model based on Markov chain is set up, and the satellite failure rate and repair rate are taken into account in the model. Moreover, the signal-in- space （SIS） and service constellation availability evaluation models are proposed by combining with the backup satellites. According to the real measured data of global positioning system （GPS）, SIS and service constellation availability are verified. The results demonstrate that the proposed evaluation models are effective and the per- formance conform GPS performance standards. Meanwhile, the satellite availability and constellation availabili- ty evaluation methods are instructive for the study of globalization construction and availability evaluation of Bei- Dou navigation satellite system.
出处
《系统工程与电子技术》
EI
CSCD
北大核心
2017年第4期814-820,共7页
Systems Engineering and Electronics
基金
国家自然科学基金(61571309
61101161)
中央高校基本科研业务费(3132016317)
辽宁省"百千万人才工程"培养经费
交通运输行业水上智能交通行业重点实验室开放课题资助课题
关键词
全球导航卫星系统
全球定位系统
马尔可夫过程
单星可用性
星座可用性
global navigation satellite system （GNSS）
global positioning system （GPS）
Markov chain
per-slot availability
constellation availability
