Research Papers

Test of a non-local excess phase delay operator for GPS radio occultation data assimilation

[+] Author Affiliations
Hui Shao, Xiaolei Zou

The Department of Meteorology, Florida State University, Room 404 Love Building, Tallahassee, FL 32306-4520

George A. Hajj

Jet Propulsion Laboratory, M/S 238-600, 4800 Oak Grove Dr., Pasadena, CA 91109

J. Appl. Remote Sens. 3(1), 033508 (February 12, 2009). doi:10.1117/1.3094060
History: Received August 19, 2008; Revised January 21, 2009; Accepted February 8, 2009; February 12, 2009; Online February 12, 2009
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Abstract

A physically-sound, non-local excess phase delay observation operator is developed for simulating excess phase delay measurements from GPS radio occultation (RO) missions. By approximating an observed ray by a straight line, the refractivity gradient information along an observed ray path is included in the simulated excess phase delay. This observation operator is used to simulate observations from the German CHAllenging Minisatellite Payload (CHAMP) RO mission based on large-scale analysis. The need to use such an observation operator for GPS RO data assimilation in spherically asymmetric regions is shown by results from a set of forward simulation and data assimilation experiments. A modification that renders the non-local excess phase delay observation operator more suitable for parallel implementation of GPS RO data assimilation is proposed.

© 2009 Society of Photo-Optical Instrumentation Engineers

Topics

Simulations

Citation

Hui Shao ; Xiaolei Zou and George A. Hajj
"Test of a non-local excess phase delay operator for GPS radio occultation data assimilation", J. Appl. Remote Sens. 3(1), 033508 (February 12, 2009). ; http://dx.doi.org/10.1117/1.3094060


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