Using the Global Navigation Satellite System and satellite altimetry for combined Global Ionosphere Maps

Details Using the Global Navigation Satellite System and satellite altimetry for combined Global Ionosphere Maps Using the Global Navigation Satellite System and satellite altimetry for combined Global Ionosphere Maps

Aug 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008adspr..42..727t&link_type=abstract

Advances in Space Research, Volume 42, Issue 4, p. 727-736.

Computer Science

4

Scientific paper

For deriving global maps of the Total Electron Content (TEC) from space geodetic techniques usually observations from the Global Navigation Satellite System (GNSS) are taken. However, the GNSS stations are inhomogeneously distributed, with large gaps particularly over the sea surface. Within this study we create Global Ionosphere Maps (GIM) from GNSS data and additionally introduce satellite altimetry observations, which help to compensate the insufficient GNSS coverage of the oceans. The obtained global maps are in 2 h intervals and daily values of Differential Code Biases (DCB) for all the GNSS satellites and receivers are also estimated. The combination of the data from around 160 GNSS stations and two satellite altimetry missions Jason-1 and TOPEX/Poseidon is performed on the normal equation level. The comparison between the integrated ionosphere models and the GNSS-only maps shows a higher accuracy of the combined GIM over the seas. The study aims at improved combined global TEC maps, which should make best use of the advantages of each particular type of data and have higher accuracy and reliability than the results derived by the two methods if treated individually.

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