空间信号完好性监测技术研究

Research on Integrity Monitoring Technology of Signal in Space

星基增强导航系统(SBAS)通过向用户提供用户差分距离误差(UDRE:User Differential RangeError),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,并做了相应的仿真分析和比较,结果表明:改进算法能够对UDRE做出更好的估计来满足星历及钟差改正误差相对应的伪距误差的置信限值。

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 use of Kalman filter, then calculating UDRE based on filter error estimation accuracy. Simulation analysis and comparison indicates that this UDRE calculation algorithm is able to estimate UDRE better to meet confidence limitation of pseudo-range error relevant to ephemeris and clock correction error.