BeiDou Navigation Satellite System (BDS) integrates legacy PNT service and authorized SBAS service, where SBAS service provides differential corrections and integrity information for authorized users. Current BDS differential corrections include one-dimensional equivalent satellite clock and ionospheric grids corrections, which is derived based on CNMC-smoothed pseudo-range observations. To improve the performance of BDS SBAS service, an algorithm is developed to estimate the real-time satellite clock and orbit corrections. In the algorithm, phase smoothed pseudo-range observation is used to define absolute value, and epoch differenced phase observation is used to define epoch-wise variation of the satellite clock/orbit corrections. It is analyzed that the impact of data sampling rate and station number on the correction parameter estimation. Real-time data of the BDS tracking network in China is used to validate the new algorithm. Compared with the current system performance:① mean UDRE using the new algorithm is reduced by 27%,35% and 27% for GEO, IGSO and MEO satellites, ② mean positioning error using the new algorithm is reduced by 23%,32% and 52% in the North, East and Up components, respectively. Implementing the new algorithm, BDS SBAS service supports the user positioning requirement with accuracy better than 1 m.
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Chen et al. (2017) studied this question.