ARAIM with BDS in the Asia-Pacific region

The new constellations and civil signal will greatly improve the accuracy and integrity of navigation and positioning, which provide an opportunity for the development of Advanced Receiver Autonomous Integrity Monitoring (ARAIM). Based on the characteristics of the current BDS, different Integrity Support Message (ISM) parameters are assumed to analyze availability and integrity in the stations and the Asia-Pacific region. Simultaneously, GPS/BDS and GPS/GLONASS are compared in ARAIM to investigate the Multi-Constellation performance of ARAIM and the effect of the BDS in the Asia-Pacific region. Real data were collected for one week in 2017 at four Multi-GNSS Experiment (MGEX) sites were used and the Asia Pacific region was simulated. The results show that BDS can currently provide Localizer Performance with Vertical guidance down to 200 feet service (LPV-200) approaches with above 90% availability in the Asia-Pacific region with optimal parameters and the most realistic parameters. In addition, compared with GPS/GLONASS, the availability of GPS/BDS has better performance in the Asia-Pacific region. However, the integrity is affected by the BDS constellation structure, and the vertical positioning error is larger and presents a certain periodicity. It cannot be bounded by the protection level at most of the time. The simulation results showed similar tendencies as the real data results.