Abstract: Aiming at improving the accuracy of satellite navigation， a carrier phase smoothing pseudorange correction algorithm was put forward as an improved scheme. Divergence free smoothing filtering technology was used to solve ionospheric error problem. By using the error model predictive value in signal propagation， the carrier signal and the pseudorange， the attenuation factor was determined. The dual frequency carrier signal phase value and pseudorange value were linearly combined， which was then put into the filter. At the same time， the satellite information was used to correct clock offset on smoothing pseudorange. The simulation results show that the algorithm can reduce the residual of the signal after filtering and improve carrier phase smoothing pseudorange correction value availability of standard deviation， as well as reduce the impact of ionospheric error on the positioning accuracy in the satellite based navigation precision approach stage.

Key words: GBAS(ground-based augmentation systems), carrier phase smoothing pseudorange, ionospheric delay, error correction, differential correction