ARAIM Integrity and Continuity Considering Fault Detection and Exclusion

Multi-constellation global navigation satellite system (GNSS) will open the possibility to enhance navigation service performance due to more redundant satellites in view. However, there is a heightened likelihood of satellite fault occurrences, which can result in more mission interruptions and increase the continuity risk. In response, fault exclusion algorithms are indispensable to reducing the continuity risk and maintaining continuous navigation services, however, will bring about increased integrity risk resulting from incorrect exclusions. For that, we introduce a critical parameter in the advanced receiver autonomous integrity monitoring (ARAIM) algorithm to guarantee minimum integrity performance sacrifices while satisfying the continuity performance. In this algorithm, the parameter is used to allocate the continuity requirement between fault detection and exclusion (FDE) tests. An experiment involving 24 h data of GPS and BDS is conducted to demonstrate the performance of ARAIM based on the determined parameter. The results suggest that ARAIM based on the determined parameter can provide more availability of 88.70%, whereas ARAIM based on a given half allocation provides 83.48% availability.