Abstract:We propose a PPP partial ambiguity resolution method based on the UPD(uncalibrated phase delays) of receiver. We correct the float ambiguity using the satellite UPD product, and obtain the UPD of receiver by the trigonometric function independent of integer. We estimate the UPD of receiver based on the undifferenced method, and carry out partial ambiguity resolution according to the undifferenced narrow-lane ambiguity covariance. In order to verify the method, we select a global distributed network of 225 server stations and 14 receiver stations. The results show that, compared with PPP float solution, the positioning accuracy of the traditional method and the new method in static situation is improved by 68.3% and 76.4% respectively, and the convergence time is reduced by 56.3% and 69.9% respectively. The positioning accuracy of the traditional method and the new method in dynamic situation is improved by 65.7% and 84.7% respectively, and the convergence time is reduced by 61.8% and 71.1% respectively. The results indicate that the new method can effectively improve the positioning accuracy and convergence speed of PPP.