Abstract:In order to investigate the optimal estimation strategy of inter system bias(ISB), we estimate ISB in static PPP test based on five handling schemes, including gaussian white noise, 20 min piecewise constant, 30 min piecewise constant, 1 h piecewise constant and 2 h piecewise constant. The observation data of the GPS, BDS, GLONASS and Galileo is provided by IGS and the precision satellite clock and precision orbit products are provided by GFZ. We obtain the coordinate deviations in three directions of east (E), north (N) and up (U) directions respectively, using these data to analyze the convergence time and positioning accuracy of multi-system fusion PPP under different ISB solution strategies. The results show that, in multi-system combination PPP, the 20 min piecewise constant estimation strategy performs best in consideration of the strength of the observed model and the stability and reliability of the positioning results. The convergence time is about 30 min and the positioning accuracy is better than 2 cm, 1 cm and 5 cm in E, N, U directions, respectively.
HONG Ju,TU Rui,WANG Xingxing et al. The Influence of Inter System Bias Constant Estimation Strategy on Multi-System Static Precision Point Positioning[J]. jgg, 2019, 39(9): 947-951.