摘要
加权几何精度因子(WDOP)是影响导航接收机定位精度的一个度量。从WDOP值的研究入手,讨论了其值不仅与卫星/用户几何布局有关,还与加权矩阵相关。提出了一种基于灰色关联分析法和广义延拓逼近法来构造加权矩阵的新方法,讲述该方法的原理和具体实现过程,并以GPS导航系统为研究对象,在GPS软件接收机研究平台上进行仿真实验,对实验结果从准确性和稳定性两方面进行了比较分析。仿真结果表明使用这种方法构造的加权矩阵进行定位,定位结果准确度高,稳定性好。
WDOP（Weighted Dilution of Precision） is a kind of measurement of satellite position accuracy. Its value can be influenced not only by geometric distribution of satellites and user, but also by weighted matrix. After studying WDOP, a new method of constructing weighted matrix, which was based on Gray Correlation Analysis method and Generalized Extended Approximation method, was put forward in this paper, as well as the principle and the way to realize the new method. Simulations based on GPS software receiver were carried out. Stability and accuracy performance of results were analyzed and compared. The simulation results show that the high accuracy and the good stability of the position results can be obtained by using the weighted matrix constructed by the proposed approach.
出处
《宇航学报》
EI
CAS
CSCD
北大核心
2009年第2期526-531,共6页
Journal of Astronautics
基金
国家重点基础研究发展计划(2007CB815500)
关键词
全球卫星定位系统
加权几何精度因子
灰色关联分析
广义延拓
软件接收机
GPS （Global positioning system）
Weighted dilution of precision
Gray correlation analysis
Generalized extended approximation
Software receiver
