基于载波相位的完整性监测及其优化方法

Research on RAIM Design Based on Carrier Phase

根据垂直保护限准则,利用载波相位观测信息,提出一种用于飞机精密进近着陆阶段的GPS接收机自主完整性监测优化方法。该方法不增加外部观测量,将整个飞机精密进近着陆过程分成若干独立观测时段,时段中任意一个历元报警,则整个时段报警;在满足国际民航组织规定的每个时段误警率和漏检率设计指标前提下,时段误警事件是单历元误警事件的和事件,时段漏检事件是单历元漏检事件的积事件。试验结果表明,应用该优化方法,在垂直方向上,漏检概率由时段的1×10^(-9)/15s增加到单历元的1×10^(-0.6)/s,有效地减小了垂直保护限值VPL,增强了GPS卫星导航系统的可用性。

Based on the carrier phase observation,a new optimized method of receiver autonomous integrity monitoring (RAIM) is presented.The optimized method,which adds no external observations,divides the whole precision approach and landing phase into several independent periods of time.Each epoch in the period of time has warning event,then the period of time has the same warning event.Meeting the design index of the period of time false alarm rate and miss detection rate,which are recommended by ICAO,the optimized method considers that the period of time false alarm probability is the sum of single epoch false alarm probability,and the miss detection event of the period of time is the product event of single epoch.Experimental results indicate that the miss detection probability is increased to 1×10^(-0.6)/s from 1×10^(-9)/15s,so the VPL is decreased greatly,and the availability of GPS in the precision approach and landing phase is increased.