摘要
卫星导航系统的定位精度主要受伪距测量的精度和卫星的空间几何分布两方面的影响，GPS等相同轨道分布的卫星导航系统一般采用DOP（几何精度因子）来分析定位精度。我国的转发式卫星导航定位系统CAPS是由GEO商用通信卫星以及一定数量的倾斜轨道通信卫星（IGSO）组成的混合星座导航系统，转发地面控制站信号，实现导航定位等功能。由于不同轨道卫星轨道误差不同，用户得到的卫星轨位精度和测量伪距精度也不相同．因此定位精度计算时必须考虑这种差异。本文引入加权几何精度因子（WDOP）的概念，对CAPS的定位精度进行了分析。通过仿真实验可以看出，由加权几何精度因子计算所得的定位精度能更真实地描述定位精度状况。
Positioning accuracy of satellite navigation system is subjected to the influence of observation＇s accuracy for pseudo- range and the geometrical configuration of constellation. Generally GPS and other similar satellite navigation system using geometric dilution of precision （GDOP） to analyze the positioning accuracy. The transmitting satellite navigation and positioning system CAPS of our country is the mixed constellation navigation system, which is composed of GEO commercial communication satellites and a certain number of inclined geosynchronous orbit （IGSO） satellites. They are used to transmit signals from the ground station to realize like navigation and positioning. Due to the orbit errors for different orbit satellite, pseudo-range measurement accuracy the user received is not the same, so the difference must be considered when calculating positioning accuracy. The weighted dilution of precision （WGDOP） is introduced in this paper, we analyzed positioning accuracy of CAPS satellite navigation system. The simulation results show that positioning accuracy calculating from WDOP can be further improved when the user equivalent range error are the same.
出处
《电信科学》
北大核心
2010年第12期106-109,共4页
Telecommunications Science
基金
国家重点基础研究发展计划（“973”）项目基金资助课题（No.2007CB815504）
关键词
CAPS
卫星导航
定位精度
灵敏度
加权几何精度因子
Chinese area positioning system, satellite navigation, positioning accuracy, sensitivity, weighted dilution of precision
