Dual smoothing ionospheric gradient monitoring algorithm for dual-frequency BDS GBAS  

作　　者：Zhipeng WANG Yu YIN Dan SONG Kun FANG Qiang LI Xiao LI 

机构地区：[1]National Key Laboratory of CNS/ATM,School of Electronic and Information Engineering,Beihang University,Beijing 100083,China [2]Beijing Hualong Tong Science and Technology Co,Ltd,Beijing 100084,China

出　　处：《Chinese Journal of Aeronautics》2020年第12期3395-3404,共10页中国航空学报（英文版）

基　　金：financial support from the National Natural Science Foundation of China(Nos.61871012,U1833125);a project from the Ministry of Industry and Information Technology(Airborne RAIM/ARAIM Technology);Open Fund Project of Intelligent Operation Key Laboratory of Civil Aviation Airport Group(No.KLAGIO20180405);the Young Top Talent Support Program of Beihang University;the Beijing Nova Program of Science and Technology(No.Z191100001119134)。

摘　　要：In this study,a Dual Smoothing Ionospheric Gradient Monitor Algorithm(DSIGMA)was developed for Code-Carrier Divergence(CCD)faults of dual-frequency Ground-Based Augmentation Systems(GBAS)based on the Bei Dou Navigation Satellite System(BDS).Divergence-Free(DF)combinations of the signals were used to form test statistics for a dualfrequency DSIGMA.First,the single-frequency DSIGMA was reviewed,which supports the GBAS approach service type D(GAST-D)for protection against the effect of large ionospheric gradients.The single-frequency DSIGMA was used to create a novel input scheme for the dual-frequency DSIGMA by introducing DF combinations.The steady states of the test statistics were also analysed.The monitors were characterized using BDS measurement data,whereby standard deviations of 0.0432 and 0.0639 m for the proposed two test statistics were used to calculate the monitor threshold.An extensive simulation was designed to assess the monitor performance by comparing the Probability of Missed Detection(PMD)according to the differential error with the range domain PMD limits under different fault modes.The results showed that the proposed algorithm has a higher integrity performance than the single-frequency monitor.The minimum detectable divergence with the same missed probability is less than 50%that of GAST-D.

关 键 词：Approach Augmentation Integrity Ionosphere-monitoring Satellite navigation Smoothing algorithms Steady state Threshold 

分 类 号：P228.4[天文地球—大地测量学与测量工程]