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Obtaining single path phase delays from GPS double differences
Author(s) -
Alber Chris,
Ware Randolph,
Rocken Christian,
Braun John
Publication year - 2000
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 - 10.1029/2000gl011525
Subject(s) - global positioning system , water vapor , multipath propagation , remote sensing , phase (matter) , radiometer , path (computing) , environmental science , gps signals , antenna (radio) , computer science , geodesy , meteorology , geology , assisted gps , physics , telecommunications , computer network , channel (broadcasting) , quantum mechanics
We describe a method for obtaining single‐path phase delays from GPS double differences. The resulting “zero differences” (ZDs) can be used for remote sensing of atmospheric water vapor. The method is demonstrated by simulating and observing atmospheric delay gradients, and by comparing ZDs with pointed radiometer observations of integrated water vapor along GPS ray paths. In‐situ GPS antenna phase center and multipath effects are mapped in ZD residuals for a specific site and network. We conclude that ZDs derived from GPS network data show promise for real time sensing of water vapor for use in meteorological modeling and forecasting.