Impact of higher-order ionospheric terms on GPS estimates

Details Impact of higher-order ionospheric terms on GPS estimates Impact of higher-order ionospheric terms on GPS estimates

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3223311f&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 23, CiteID L23311

Statistics

Applications

35

Geodesy And Gravity: Reference Systems, Geodesy And Gravity: Space Geodetic Surveys, Geodesy And Gravity: General Or Miscellaneous (1709), Radio Science: Ionospheric Propagation (0689, 2487, 3285, 4275, 4455)

Scientific paper

Dual frequency GPS observables only allow the elimination of the 1st-order ionospheric term. Although higher-order ionospheric terms may cause a range bias of several centimeters, accounting for such effects is not yet a common strategy for GPS data analysis. In comparison to previous investigations a rigorous application of 2nd and 3rd-order ionospheric corrections is examined for the estimation not only of receiver positions but of all included parameters. The results reveal a linear dependence of the frame's origin on the integrated electron density. Furthermore, satellite positions are affected at the centimeter level when applying the above-mentioned corrections. Since the ionospheric correction terms show a significant impact on various GPS estimates, their consideration becomes necessary for scientific applications. Hence, the modeling of 2nd and 3rd-order ionospheric correction terms is part of the optimized strategy in an ongoing reprocessing project dealing with a global GPS network and spanning the time period from 1994 up to present time.

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