Resolution of GPS carrier-phase ambiguities in Precise Point Positioning (PPP) with daily observations

摘要: Precise Point Positioning (PPP) has been demonstrated to be a powerful tool in geodetic and geodynamic applications. Although its accuracy is almost comparable with network solutions, the east component of PPP results still improved by integer ambiguity fixing, which is, up now, prevented presence uncalibrated phase delays (UPD) originating receivers satellites. In this paper, it shown that UPDs are rather stable time space, can estimated high reliability through statistical analysis ambiguities from reference network. An approach implemented estimate fractional parts single-difference (SD) between satellites wide- narrow-lane global By applying obtained SD-UPDs as corrections SD-ambiguities at single station, corrected have naturally feature therefore fixed values usually done for double-difference ones mode. With data collected 450 stations International GNSS Service (IGS) days 106 119 2006, efficiency presented ambiguity-fixing strategy validated using IGS Final products. On average, more than 80% independent could reliably, leads an improvement about 27% repeatability 30% agreement weekly solutions station coordinates, compared real-valued solutions.