BDS-3多频相位观测值偏差估计及非差模糊度固定OA

In order to further analyze the performance of BDS-3 multi-frequency precise point positioning(PPP),based on the deduced BDS-3 multi-frequency phase OSB estimation method and undifferenced PPP-AR model,the distribution of PPP ambiguity residuals,positioning accuracy,convergence time,and ambiguity fixing rate were studied.The results show that the phase OSB obtained based on this method are suitable for ambiguity resolution using any frequency combinations.Compared with the B1I/B3I dual-frequency kinematic ambiguity-float solution,the positioning accuracy of the ambiguity-fixed solution in the east,north and up directions are improved by 28.2%,19.3%and 12.9%,respectively.In addition,compared with the traditional frequency B1I/B3I combination,the convergence speed of the PPP ambiguity-fixed solution of the new frequency B1C/B2a combination is significantly improved,and its three-dimensional positioning accuracy in the first epoch is improved by about 25%.With in-depth research on the new frequencies of BDS-3 and the widespread application of OSB products,more frequency options will be provided for high-precision positioning users when implementing PPP-AR.