一种地基增强系统(GBAS)B值的分析与处理技术

Analysis and Processing of B-Values for GNSS GBAS

地基增强系统中采用B值是多个接收机输出观测量偏差,是地面站系统进行完好性监测的重要参数之一,为系统进行基于接收机故障的完好性风险评估提供基础判断依据。在单系统的卫星导航着陆系统中,B值的处理采用了伪距修正残差的基本思想,但对于多系统卫星导航系统情况下,接收机的故障需要进行独立分析和综合判断,判断的门限也存在区别,因此,本文基于地基增强系统中B值的计算方法,针对GPS系统进行B值的计算分析,提出了一种适用于多系统的B值计算方法,为多系统地基增强系统的完好性监测处理方法进行了研究和分析。

B-values are the difference ofpseudorange corrections for multiple reference receivers on GBAS （Ground Based Augmentation System）. It is one of important parameters for the ground system integrity monitoring, which is used as a basic reference for the integrity risk estimation based on reference receivers＇ failure. For single satellite navigation system, the residual of pseudorange corrections is adopted in the B-value processing. However, an independent analysis and integrated processing are necessary for detecting the failure of multiple reference receivers. Therefore, a new B-value algorithm available for multiple systems is put forward based on the traditional B-value processing method and the analysis of GPS data. The algorithm can be used for integrity monitoring for future GNSS GBAS system.