北斗定时接收机T-RAIM算法研究

Research on the T-RAIM algorithm of Beidou timing receiver

传统T-RAIM算法对微小缓变等故障检测能力弱,对可见星数量也有一定要求,其可用性有所降低,导致北斗定时接收机应用受限。结合快照法和滤波法在故障检测上各自的优势,提出一种改进的T-RAIM算法。通过不同卫星故障场景的仿真验证表明该算法可检测最小故障偏差在37ns左右,可见星少场景下也可识别故障卫星,能够提供更好的定时完好性服务。

Traditional receiver autonomous integrity monitoring algorithm （T-RAIM） is weak in detecting weak and slowly changing faults, and the number of visible satellites is also certainly required. It leads to limited application of BeiDou timing receiver. Combined the advantages of the snapshot method and the filtering method in fault detection, an improved T-RAIM algorithm is proposed. According to simulation verification of different satellite failure scenarios, this algorithm can detect the minimum fault deviation about 37 ns,and identify fault satellites in the case of less visible satellites. It can provide better timing integrity services.