Vertical Protection Level Optimization and Availability Analysis for Advanced RAIM

With the introduction of global navigation satellite systems (GNSSs) in aviation, there has been increased dependency on GNSS position. Multi-constellation services and equipment will remain a solution for many aircraft positions safety. can improve robustness performance. Therefore, advanced receiver autonomous integrity monitoring (advanced RAIM or ARAIM) technology is being developed as an augmentation method users under multi-constellation. ARAIM allow service level globally provide vertical guidance during approach phase aircrafts. Since traditional algorithm uses average allocation strategy to allocate continuity risk, based particle swarm optimization (PSO) presented this article. Different strategies risk are chosen different particles, weighted sum protection corresponding fault subsets selected fitness function optimize VPL. Based real data, multi-constellation analyzed. The experimental results demonstrate that proposed optimizes VPL improves availability