GPS radio occultation with GRACE: Atmospheric profiling utilizing the zero difference technique
Article first published online: 6 JUL 2005
Copyright 2005 by the American Geophysical Union.
Geophysical Research Letters
Volume 32, Issue 13, July 2005
How to Cite
2005), GPS radio occultation with GRACE: Atmospheric profiling utilizing the zero difference technique, Geophys. Res. Lett., 32, L13806, doi:10.1029/2005GL023109., , , , , and (
- Issue published online: 6 JUL 2005
- Article first published online: 6 JUL 2005
- Manuscript Accepted: 6 JUN 2005
- Manuscript Revised: 31 MAY 2005
- Manuscript Received: 30 MAR 2005
 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.