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Elimination of Tropospheric Delays

Elimination of Tropospheric Delays. Elimination of Tropospheric Slant Range Delays in GPS observations with Ray Tracing through the ECMWF Numerical Weather model. Ray Tracing Procedure Comparison GPS-ECMWF Delay Elimination in RINEX Data. T. Pany, Institut für Weltraumforschung der ÖAW. B.

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Elimination of Tropospheric Delays

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  1. Elimination of Tropospheric Delays Elimination of Tropospheric Slant Range Delays in GPS observations with Ray Tracing through the ECMWF Numerical Weather model • Ray Tracing Procedure • Comparison GPS-ECMWF • Delay Elimination in RINEX Data T. Pany, Institut für Weltraumforschung der ÖAW

  2. B Virtual Ref. C Rover D A RTK Basics • RTCM 2.1: Rover gets RTCM 3/18/19 msg. via a data link • Forms double differences, cleans the data • Fixes the L5 ambiguities (Noaccurate ionospheric modeling, short distances <15km) • Ionospheric free L3-float solution: Fixes L1/L2 ambiguities (tropospheric and orbit errors) • Short distance to reference station necessary to solve ambiguities fast and reliably • Calculate virtual GPS observationsnearby the Rover

  3. Ingredients • Central data processing • Accurate determination of • Ionosphere (Use of sophisticated models, ionospheric tomography) • Troposphere (Height dependence) • Orbit errors (Alternative: use predicted orbits) • Interpolation of these error sources to the position of the virtual reference station • Bilinear interpolation (Wanninger) • Least squares interpolation (H. van der Marel) • Physical modeling (Kalman filter, tomography, numerical weather models)

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