卫星导航系统HDOP和VDOP的研究  

Research on the HDOP and VDOP of Satellite Navigation Systems

作　　者：张淼艳[1] 张军[1] 朱衍波[1] 

机构地区：[1]北京航空航天大学电子信息工程学院,北京100191

出　　处：《遥测遥控》2009年第2期6-12,共7页Journal of Telemetry,Tracking and Command

基　　金：国家自然科学基金委员会与中国民用航空总局联合资助项目(60672181);国家863高技术研究发展计划(2006AA12A101)

摘　　要：精度因子(DOP)表征可见卫星在空间几何分布的好坏,对测距误差起着放大作用。DOP越小,定位精度越高。现有研究均针对几何精度因子(GDOP)。文中根据卫星导航系统水平精度因子(HDOP)和垂直精度因子(VDOP)在民用航空导航中的应用,从三个方面对HDOP和VDOP进行了分析、仿真和研究,可知:地心地固(ECEF)坐标系和站心坐标系下的HDOP和VDOP是不同的,只在纬度为90°时相同;站心坐标系下,不同星座配置对不同纬度地区的HDOP和VDOP产生不同的影响,卫星数目的增加有利于减小HDOP和VDOP,而星座轨道平面仰角的增加有利于改善高纬度地区的HDOP和VDOP;ECEF坐标系和站心坐标系下,所有的精度因子均随卫星数目的减少而递增。Dilution of Precision(DOP) is caused by various satellite geometrical configurations and depends solely on ge-ometry.Positioning accuracy can be estimated as the ranging accuracy multiplied by DOP.Current researches are all about Geo-metric DOP(GDOP).Based on the application of Horizontal DOP(HDOP) and Vertical DOP(VDOP) in the civil aviation,three main aspects of HDOP and VDOP are analyzed,simulated and studied.It is concluded that HDOP and VDOP are changed by the coordinate conversion from the Earth Centered Earth Fixed(ECEF) coordinate system to the topocentric coordinates except the position whose latitude is 90o.In the topocentric coordinates,HDOP and VDOP decrease along with the increasing of the number of satellites.In the high latitude area,HDOP and VDOP decrease along with the increasing of the obit elevation.In the topocentric coordinates and ECEF,all DOPs increase along with the decreasing of the number of satellites.

关 键 词：卫星导航系统 DOP HDOP VDOP 

分 类 号：P228.4[天文地球—大地测量学与测量工程]