Quality Analysis of Observation Data of BeiDou-3 Experimental Satellites

摘要

Five new-generation BeiDou global experimental satellites (BDS-3) have been launched into inclined geosynchronous orbit (IGSO) and medium orbit (MEO) since March 2015. The quality of observation data has a direct impact on the performance of navigation, positioning and timing service. Therefore, it is very important to analyze the observation data quality of new-generation BDS satellites, for evaluating the service performance of BDS-3. In this paper, the practical observation data of 16 iGMAS stations and 6 MGEX stations from 21 August to 20 September 2017 are selected, because they can receive the observation data of BDS-3, BDS-2 (BeiDou regional navigation system) and GPS (Global Positioning System). The observation data quality of BDS-3, BDS-2 and GPS are analyzed and compared, including the data integrity rate, multipath, signal-to-noise ratio (SNR), ionospheric delay and cycle slip ratio. The results show that the data integrity rate on the B1 and B3 frequency of BDS-3 and BDS-2 are at the same level. The SNR of BDS-3 are outperformed that of BDS-2. The multipath error and the ionospheric delay error of BDS-3 are slightly better than those of BDS-2. And the cycle slip ratio of BDS-3 is similar to that of BDS-2. Therefore, the new-generation BDS-3 satellites can meet the normal working requirements and the data quality of BDS-3 is better than that of BDS-2 in general.