Assimilation technique of GPS/LEO occultation date

Details Assimilation technique of GPS/LEO occultation date Assimilation technique of GPS/LEO occultation date

Mar 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006pabei..24...27l&link_type=abstract

Progress in Astronomy (ISSN 1000-8349), Vol. 24, No. 1, p. 27 - 42 (2006)

Astronomy and Astrophysics

Astronomy

Astrometry, Assimilation, Review, Gps/Leo, Radio Occultation, 1Dvar, 4Dvar

Scientific paper

After introducing the history and development of GPS/LEO radio occultation technique, we discuss the theory of retrieval technique. The importance of the 1DVAR is demonstrated in the retrieval technique by analyzing the problems in standard retrieval technique. Then we describe the cost function of 1DVAR and the sorts of assimilation parameters in detail. Furthermore, we introduce the 4DVAR, which is popular used in meteorology nowadays. We especially analyze the different assimilation techniques and the benefits and defects of using different assimilation parameters. At last, by CHAMP radio occultation observations, we prove that the GPS measurement plays an important role in NWP, and compared to the standard retrieval technique, there are also natable improvements after using the 1DVAR.

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