Multiple Reference Consistency Check Algorithm in GBAS Based on S-Values Auxiliary

Abstract

Ground based augmentation system (GBAS) is one of the core infrastructures of future air traffic management system based on performance navigation, and the calculation of the B-values in the multiple reference consistency check (MRCC) algorithm is the core algorithm for the integrity monitoring of the GBAS ground station. In view of the traditional B-values processing algorithm cannot effectively distinguish between the receiver faults and the satellite faults, a new fault detection algorithm by calculating the S-values of the difference values of the pseudorange has been proposed, and the threshold of the S-values is determined by Gaussian overbounding method. So, the failure satellites and receivers can be marked out by combining the B-values detection algorithm and the S-values detection algorithm, and then the set of available satellites and receivers can be obtained. Taking the GBAS platform built in the laboratory as the object of study, the MRCC algorithm which is based on S-values auxiliary information is verified and analyzed. The experimental results show that the new algorithm proposed here can effectively eliminate the fault satellites, enhance the integrity of the GBAS, and thus improve the availability of the navigation system.