Processing algorithms and performance evaluation of BDS RDSS location reporting service
Junping Chen, Yize Zhang, Yu Chao, Junsheng Ding · DOAJ (DOAJ: Directory of Open Access Journals) · 2022
RDSS (radio determination satellite service) short message is a characteristic service of the BeiDou satellite navigation system (BDS), which realizes user short-message communication and location reporting. The BDS RDSS based location reporting was realized for the first time on its first-generation system (BDS-1) using two GEO (geo-stationary earth orbit) satellites, and its accuracy was limited by the accuracy of the digital elevation model (DEM) database, which was used to assist its realization of 3D positioning service using two satellites only. Starting from its regional System (BDS-2), BDS has developed new technology of the location reporting in the Master Control Center (MCC) by integrating the RNSS (radio navigation satellite system) and RDSS observations. In the new development, the RNSS range and carrier phase observations of user stations are transmitted to the MCC through RDSS link, and the RNSS observations are used to determine users' precise positions in the MCC. Supported by the various types of precise spatio-temporal data, e.g. precise satellite orbits and clocks, the precision of user positioning is thus greatly improved. In this paper, we introduce the three location reporting processing algorithms used in the MCC central station, and evaluates their performance with respect to the sampling rates and baseline length. Data of the 50 BDS tracking stations in Mainland China is used to validate the performance. Results show that the precision of the location reporting realized in the MCC reaches 0.51 m and 0.94 m for horizontal and height components, respectively. The positioning precision shows little relation to both the baseline length and sampling rates, while the precision of BDS-2+BDS-3 combined solutions is improved by around 50% over the solutions using BDS-2 observations only.