星钟／星历完好性监测技术研究  

Research on Integrity Monitoring Technology of Signal in Space

作　　者：李锐[1] 李娟[2] 

机构地区：[1]北京航空航天大学,100191 [2]空军装备研究院通信所,北京100085

出　　处：《现代导航》2010年第2期1-6,共6页Modern Navigation

摘　　要：星基增强导航系统（SBAS）通过向用户提供用户差分距离误差（User differential range error,UDRE），来保证广播星历和星钟改正数的精度。本文设计了UDRE的一种改进算法，建立卫星导航系统星钟和星历误差的状态方程和量测方程，进行卡尔曼滤波计算星历与星钟误差改正数与改正精度，通过滤波误差估计精度矩阵计算UDRE，针对基准站对卫星UDRE影响因素，仿真分析基准站高度截止角和数目分布对三种卫星倒DOP及UDRE的影响，仿真结果表明：基准站的高度截止角选为15°，基准站数目选择20个以上较为合适。Satellite Based Augmentation System （SBAS） provides user differential range error （UDRE） to ensure accuracy of broadcast ephemeris and satellite clock corrections. The paper presents an improve algorithm for UDRE calculation by creating status and measurement equations of satellite navigation system clock as well as ephemeris error, calculating correction data with accuracy estimation matrix of ephemeris and clock error by Kalman filter, then calculating UDRE based on filter error estimation accuracy. Simulation on the impact of reference station on satellite UDRE is carried out through analyzing the effects of reference stations＇ mask angles and numbers on the TDOP and UDRE of three different types of satellite. Simulation analysis proves that the mask angle of reference stations is 15 degree, and the umber of reference stations is more than 20.

关 键 词：星基增强导航系统 用户差分距离误差 倒DOP 

分 类 号：TN967.1[电子电信—信号与信息处理]