Abstract
Constellation of regional BDS has been completed with five Geostationary Earth Orbit (GEO) satellites, five Inclined Geosynchronous Satellite Orbit (IGSO) satellites and four Medium Earth Orbit (MEO) satellites, which can provide positioning, navigation, timing, short-message communication and other services for regional users. China's BDS continues to develop a global system in near future. In order to analyze and assess the positioning performance of BDS B1 frequency, we discuss and analyze the performance of regional BDS (5 GEO + 5 IGSO + 4 MEO) and global BDS (5 GEO + 3 IGSO + 27 MEO) with simulated data in term of satellite visibility, PDOP value and positioning accuracy in the most regions of China. Wuhan station is also selected to test positioning performance for a single day. The results show that the global BDS can provide Chinese users with better service. Compared with the regional BDS, the global BDS improves significantly. The number of average visible satellites increases by 8–10, the average PDOP value decreases by 1–3, and the average positioning accuracy increases by 2–3 m.
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