摘要
多卫星系统导航时,可见星数目大幅度增加,导致导航解算运算量成几十倍增长,加重了用户接收机尤其高动态接收机的负担。针对传统选星算法在卫星数目较多时耗时太长,无法满足导航实时性要求的问题,提出了一种适用于多卫星导航系统选取多颗次优星的快速选星算法,通过建立多卫星导航系统的几何精度因子(GDOP)分析模型,基于可见星仰角及方位角的分区、筛选,给出了被排除卫星的分布规律。仿真结果表明,在损失较少定位精度的情况下,可大大减少导航定位解算的运算量。
When Multi-satellite navigation system works, the increase in visible satellites leads to grow the computation of navigation solution by several dozens times, imposing heavy burden on user＇s receiver, especially on high dynamic receiver. Comparing with traditional satellite selection algorithm, which can＇t meet real time navigation requirement due to spending too long time in satellites selection, a fast satellite selection algorithm is proposed for multiple satellites navigation system to select several suboptimal stars. Through the establishment of the GDOP analysis model of multi-satellite navigation system, in combination with the partition and selection of the elevation and azimuth of visible satellites, a distributed rule of the excluded satellites is presented. The simulation shows that with less loss of positioning accuracy, it can substantially reduce the computation of the navigation positioning solution.
出处
《现代导航》
2013年第3期181-185,共5页
Modern Navigation
基金
国家科技支撑计划课题-GNSS地基增强系统
课题编号2011BAH24B03
关键词
多卫星导航系统
几何精度因子
快速选星算法
Multi-Satellite Navigation System
GDOP
Fast Satellite Selection Algorithm
