摘要
对于GPS/SBAS/QZSS/BDS的多星座卫星导航系统,分别分析了几何精度因子(GDOP)与系统时间差以及与定位误差之间的关系,并在此基础上,进一步提出了一种快速选星算法。该算法基于定位误差进行选星,并考虑了系统时间差对GDOP的影响。仿真结果表明,该算法的计算量相对于最佳GDOP选星有了显著降低,选星后的GDOP值非常接近最佳GDOP选星的结果,从而在定位精度损失不大的条件下降低了定位解算的运算量。
For GPS/SBAS/QZSS/BDS multi-constellation satellite navigation system, this paper analyzes the relationships between the Geometric Dilution of Precision （GDOP） value and system time bias as well as positioning error, respectively. According to the analysis, a fast satellite selection algorithm based on positioning error is fur- ther proposed. The effect of system time bias is taken into account in the algorithm. Simulation results show that, the computational complexity of the algorithm has reduced greatly compared with the best GDOP algorithm, and the GDOP value of the proposed algorithm is very close to that of the best GDOP algorithm after satellite selection. Thus, the proposed algorithm reduces the computational complexity of position solution at the expense of little position accuracy loss.
出处
《科学技术与工程》
北大核心
2015年第13期87-91,共5页
Science Technology and Engineering
基金
国家自然科学基金项目(61221004)资助
关键词
卫星导航系统
系统时间差
GDOP
选星算法
satellite navigation system system time bias GDOP satellite selection algorithm
