Brief review of the ionospheric delay models

Details Brief review of the ionospheric delay models Brief review of the ionospheric delay models

Mar 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006pabei..24...16z&link_type=abstract

Progress in Astronomy (ISSN 1000-8349), Vol. 24, No. 1, p. 16 - 26 (2006)

Astronomy and Astrophysics

Astronomy

Astrometry, Ionospheric Delay Model, Review, Klobuchar Model, Gps

Scientific paper

Usually, the ionospheric delay models can be sorted as three types - the forecast model, the real-time model and the post-processing model. Different purpose for the application of these models is required to choose one that can be used to correct the ionospheric delay efficiently. Here we compare several ionosphere delay models often used, such as the functional model used for Wide Area Augmentation System (WAAS) - trigonometric series function, polynomial model, and low degree spheric harmonics function. The three models are roughly equivalent to each other in the ionosphere delay correcting for WAAS. The TEC harmonic expansion trend function can be used to analyze the long-trend variations of the ionosphere. The International Ionosphere Reference (IRI) model, as an empirical one, can reach 60 percent of the correcting effect. The Klobuchar model as the GPS broadcast model can also achieve same effect although there are some shortcomings in the parameters setting. This model will be discussed here and some improving methods are presented.

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