Beidou Satellite-based Augmentation System Performance Evaluation Analysis

In this paper, the performance of the BDSBAS space signal was evaluated and analyzed by calculating six indicators: BDSBAS orbit error, satellite clock difference, space signal ranging error and BDSBAS grid ionospheric effective point, broadcast time and ionospheric delay error, using actual broadcast ephemeris, precision ephemeris and augmentation messages of Beidou Satellite-Based Augmentation System (BDSBAS) as experimental data. Results showed that the orbital errors of GPS satellites after BDSBAS enhancement were reduced by 34.57%, 40.57% and 30.90% in tangential, normal and radial directions respectively; the root mean square of satellite clock deviation was reduced by 24.31%, and the standard deviation of satellite clock deviation was reduced by 16.8%; the spatial signal ranging error was reduced by 32.75% compared with that before enhancement; the effective ionospheric points of BDSBAS grid. The ionospheric delay broadcast interval of all BDSBAS points meets ICAO’s requirements for accurate differential positioning; the ionospheric delay error in the range of 0°－5°N is more than 0.4 m with a confidence level of 99.9%, and in the range of 5°－55°N, the error is less than 0.4 m with a confidence level of 100%; the horizontal positioning error of BDSBAS is improved by more than 25% improvement in horizontal positioning error and over 50% improvement in vertical positioning error, all with an integrity of 99.9% or more.