摘要
介绍了GLONASS星座现状及最新发展规划,计算了该系统现有可用性。在分析GLONASS缺陷的基础上,从我国用户的需求出发,提出GLONASS/"双星"组合导航方案,阐明了其必要性和可行性。从星座可见性和几何构型两方面对系统可用性进行了仿真评估,比较了组合系统与纯GLO-NASS系统可用性的变化情况。仿真分析表明,组合系统大幅提高了系统可用性,理论可用性提高至93%以上,实际可用性提高至70%以上。
The current status and new development program of GLONASS are presented, furthermore, the existing availability of GLONASS is computed. The limitation of GLONASS system and desire for availability improvement is analyzed. Based on GLONASS current constellation, a scheme of GLONASS/＂Double Satellites＂ hybrid satellites constellation is recommended. The difference characteristics of GLONASS and ＂Double Satellites＂system is pointed out, and the influence of hybrid constellation on China region positioning performances is analyzed. The definition of constellation visibility is presented, and visibility simulation results of GLONASS/＂Double Satellites＂ integrated navigation system are provided for China region. The positioning performance of the integrated system is evaluated by simulation, and the simulation result shows that the theoretic availability of the integrated system is improved above 93 % and the practical avail- ability above 70%. Therefore, the conclusion can be drawn that the integrated navigation system has remarkably availability improvement.
出处
《电讯技术》
2007年第4期76-81,共6页
Telecommunication Engineering
