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Some tests of wet tropospheric calibration for the CASA Uno Global Positioning System Experiment
Author(s) -
Dixon T. H.,
Wolf S. Kornreich
Publication year - 1990
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl017i003p00203
Subject(s) - troposphere , global positioning system , calibration , environmental science , remote sensing , residual , geodetic datum , radiometer , geodesy , baseline (sea) , repeatability , meteorology , geology , computer science , geography , mathematics , statistics , telecommunications , oceanography , algorithm
Wet tropospheric path delay can be a major error source for Global Positioning System (GPS) geodetic experiments. We investigate strategies for minimizing this error using data from CASA Uno, the first major GPS experiment in Central and South America, where wet path delays may be both high and variable. We compared wet path delay calibration using water vapor radiometers (WVRs) and residual delay estimation, with strategies where the entire wet path delay is estimated stochastically without prior calibration, using data from a 270 km test baseline in Costa Rica. Both approaches yield centimeter‐level baseline repeatability and similar tropospheric estimates, suggesting that WVR calibration is not critical for obtaining high precision results with GPS in the CASA region.