一种多系统组合导航快速选星方法  

A fast satellite selection algorithm for multi-satellite navigation system

作　　者：马宏阳 程鹏飞 李冉[3] 黄华东[3] 

机构地区：[1]中国测绘科学研究院,北京100830 [2]中国测绘产品质量检验测试中心,北京100830 [3]山东科技大学,山东青岛266510

出　　处：《测绘工程》2016年第1期59-64,共6页Engineering of Surveying and Mapping

基　　金：北斗分析中心资助项目(GFZX0301040308-06)

摘　　要：采用多卫星导航系统组合导航,定位精度和系统可靠性会大幅提升,但导航定位运算量也会成倍增长。为解决多系统组合导航定位精度与实时性之间的矛盾,提出一种新的选星方法。新方法不追求最小GDOP值,而是以满足导航定位精度的GDOP值为前提,结合模糊理论中隶属函数的思想,按卫星在星座中均匀分布为原则进行选星。推导伪距测量的误差模型,分析了GDOP与测量误差之间的关系。北斗、GPS和GLONASS三系统组合导航选星实验结果表明,在不超过3次求解GDOP值的情况下,新方法能以不小于98%的概率得到GDOP≤4。To resolve the conflict between positioning accuracy and real-time capability when using multisatellite navigation system,a new algorithm for choosing visible satellites is presented.The operation of satellite selection of the proposed method is operated on the premise that the positioning requirement Geometric Dilution of Precision must be met,rather than calculating the minimal GDOP.By utilizing the membership function in the theory of fuzzy,the method is based on the principle of uniform distribution of satellites.The error model of pseudo range measurement is derivated and the relationship between GDOP and measurement error is analyzed. The experimental results which combine Compass, GPS and GLONASS show it can achieve GDOP≤4in no more than 98% within 3GDOP calculations.

关 键 词：卫星导航系统 选星 隶属函数 几何精度因子 

分 类 号：P228.4[天文地球—大地测量学与测量工程]