区域导航星座分析设计研究

导航星座设计涉及诸多参数的优化组合,星座设计目标就是寻找一组参数组合,使其构成的星座在指定覆盖区域既能获得最优星座性能,又节省系统建设成本和星座长期维持费用.在详细论述导航星座性能指标及其可用性算法,以及导航星座参数设计因素的基础上,进一步提出了半分析式区域导航星座设计方法,并综合分析得到4种区域导航星座设计方案.最后,通过对比研究星座性能指标及定位精度仿真结果,初步说明区域导航星座设计方法和设计方案的可行性和合理性. 

Studies on the Design and Analysis of Regional Navigation Constellations

The navigation constellation design is involved in the optimization issues of many parameters. The goal of constellation design is to search a set of parameters and generate a navigation constellation using them. It is required that not only the optimal performance for the constellation needs to be the hest, but the cost of developing and maintaining the navigation satellite system is also low. Firstly, the indexes of evaluating constellation performance, algorithms of computing constellation availability and parameters of designing constellation are described in detail in this paper. There are three primary performance indexes examined, including the continued coverage, space distribution and redundancy. Secondly, as the navigation constellation design is a multi-objective optimization issue, the semi-analysis approach is presented simply in term of the practical engineering requirement. Only considering the central earth gravity, an ideal constellation can be designed from the aspect of geometry. The constellation parameters can be obtained synthetically and optimally in the case of meeting the constellation performance indexes. Therefore, four constellation schemes are generated optimally by using the approach. Finally, by analyzing the performance indexes and positioning simulation results respectively based on four schemes, it can be shown preliminarily that the semi-analysis approach and constellation schemes are feasible and rational.