BeiDou Receiver Autonomous Integrity Monitoring (RAIM) Performance Analysis

摘要

The RAIM performance levels of BeiDou (Phase-Ⅲ with 35 satellites), GPS (with 31 satellites) and BeiDou14 (Phase-Ⅱ with 14 satellites) are assessed for the first time by the global, Asia-Pacific region and temporal variations via the statistical methods of quality control. RAIM availabilities are evaluated by the Number of Visible Satellites (NVS) and Geometric Dilution of Precision (GDOP) together. The minimum fault detection (FD) capabilities of RAIM in the measurement and position level are evaluated by the Minimal Detectable Bias (MDB) and Minimal Detectable Effect (MDE) respectively. The results show that BeiDou constellations have 0.14% RAIM holes and 0.59% unavailable constellation geometry points in the global. But BeiDou RAIM availability in Asia-Pacific region is 100%. The detectable measurement and position bias are at least 5.84m and 9.80m in global respectively. The methods and conclusions can be used for RAIM prediction and realtime assessment of BeiDou.