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Sensing atmospheric water vapor with the global positioning system
Author(s) -
Rocken Christian,
Ware Randolph,
Van Hove Teresa,
Solheim Fredrick,
Alber Chris,
Johnson James,
Bevis Mike,
Businger Steven
Publication year - 1993
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 - 10.1029/93gl02935
Subject(s) - global positioning system , water vapor , environmental science , remote sensing , radiometer , meteorology , precipitable water , geodesy , atmospheric sciences , geology , geography , computer science , telecommunications
Global Positioning System (GPS) receivers, water vapor radiometers (WVRs), and surface meteorological equipment were operated at both ends of a 50‐km baseline in Colorado to measure the precipitable water vapor (PWV) and wet delay in the line‐of‐sight to GPS satellites. Using high precision orbits, WVR‐measured and GPS‐inferred PWV differences between the two sites usually agreed to better than 1 mm. Using less precise on‐line broadcast orbits increased the discrepancy by 30%. Data simulations show that GPS measurements can provide mm‐level separate PWV estimates for the two sites, as opposed to just their difference, if baselines exceed 500 km and the highest accuracy GPS orbits are used.