title: A method of undifferenced ambiguity resolution for GPS+GLONASS precise point positioning.
abstract: Integer ambiguity resolution is critical for achieving positions of high precision and for shortening the convergence time of precise point positioning (PPP). However, GLONASS adopts the signal processing technology of frequency division multiple access and results in inter-frequency code biases (IFCBs), which are currently difficult to correct. This bias makes the methods proposed for GPS ambiguity fixing unsuitable for GLONASS. To realize undifferenced GLONASS ambiguity fixing, we propose an undifferenced ambiguity resolution method for GPS+GLONASS PPP, which considers the IFCBs estimation. The experimental result demonstrates that the success rate of GLONASS ambiguity fixing can reach 75% through the proposed method. Compared with the ambiguity float solutions, the positioning accuracies of ambiguity-fixed solutions of GLONASS-only PPP are increased by 12.2%, 20.9%, and 10.3%, and that of the GPS+GLONASS PPP by 13.0%, 35.2%, and 14.1% in the North, East and Up directions, respectively.
authors.affiliation: Collaborative Innovation Center of Geospatial Technology, Wuhan University, Wuhan 430079, China.|GNSS Research Centre, Wuhan University, Wuhan 430079, China.
authors.forename: Wenting
authors.initials: W
authors.lastname: Yi
authors.affiliation: GNSS Research Centre, Wuhan University, Wuhan 430079, China.
authors.forename: Weiwei
authors.initials: W
authors.lastname: Song
authors.affiliation: GNSS Research Centre, Wuhan University, Wuhan 430079, China.
authors.forename: Yidong
authors.initials: Y
authors.lastname: Lou
authors.affiliation: GNSS Research Centre, Wuhan University, Wuhan 430079, China.
authors.forename: Chuang
authors.initials: C
authors.lastname: Shi
authors.affiliation: School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China.
authors.forename: Yibin
authors.initials: Y
authors.lastname: Yao