摘要
由于存在较大的三维精度因子(PDOP)值,用户终端仅利用低轨通信星座中的一颗卫星自主定位时存在定位精度低、定位时间长的缺点。文中采用伪距联合高程方程实现用户终端自主定位的方案。仿真结果表明,方案可以有效提高定位精度、缩短定位时间,满足星座通信系统中用户终端自主定位的需要。此外,文中还对高程误差对水平定位精度的影响进行了分析。
Locating user’s position only by the communication constellation’s one LEO satellite has some drawbacks,such as low accuracy and long waiting time.This is related with the larger PDOP.The scheme of pseudorange equation assisted by height equation is proposed in this paper.The scheme’s performance with the algorithm is evaluated by simulations and it is proved that this scheme can effectively improve the positioning accuracy and reduce the waiting time.Hence it satisfies the con-stellation communication system’s demand.This paper also studies the positioning error caused by the height error.
出处
《遥测遥控》
2009年第1期12-14,20,共4页
Journal of Telemetry,Tracking and Command
关键词
星座通信系统
定位
伪距
高程
Constellation communication system
Positioning
Pseudorange
Height
