GPS radio occultation with GRACE: Atmospheric profiling utilizing the zero difference technique

Details GPS radio occultation with GRACE: Atmospheric profiling utilizing the zero difference technique GPS radio occultation with GRACE: Atmospheric profiling utilizing the zero difference technique

2004-09-04

arxiv.org/abs/physics/0409032v4

Physics

Geophysics

17 pages, 4 figures

Scientific paper

Radio occultation events recorded on 28-29 July 2004 by a GPS receiver aboard the GRACE-B satellite are analyzed. The stability of the receiver clock allows for the derivation of excess phase profiles using a zero difference technique, rendering the calibration procedure with concurrent observations of a reference GPS satellite obsolete. 101 refractivity profiles obtained by zero differencing and 96 profiles calculated with an improved single difference method are compared with co-located ECMWF meteorological analyses. Good agreement is found at altitudes between 5 and 30 km with an average fractional refractivity deviation below 1% and a standard deviation of 2-3%. Results from end-to-end simulations are consistent with these observations.

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