Galileo三频非组合PPP相位小数偏差估计与模糊度解算OA

Galileo already has 28 in-orbit satellites,with precise positioning capabilities on a global scale.All Galileo satellites are capable of broadcasting multi-frequency signals,and multi-frequency integration is expected to further improve the performance of precise point positioning(PPP)ambiguity-fixed solutions.In this paper,the fractional cycle bias(FCB)estimation method and ambiguity resolution(AR)method for Galileo triple-frequency uncombined(UC)PPP are developed,and the derived results are compared with those of dual-frequency UC PPP ambiguity-fixed and ambiguity-float solutions.The results indicate that the standard deviation(STD)of UC FCB series on a single frequency is better than 0.04 cycles using datasets from 155 globally distributed ground tracking stations.The convergence time of Galileo dual-frequency PPP float solutions in the east,north and up directions is 32.0 min,10.0 min and 43.5 min,respectively,and the corresponding statistic of dual-frequency PPP fixed solutions is reduced to 30.5 min,8.5 min and 32.0 min in the three directions,respectively.The convergence time of triple-frequency PPP fixed solutions is further shortened to 16.5 min,8.0 min and 32.0 min in the three directions,respectively.