Measurements by single-frequency satellite altimeter (Geosat, ERS-1) require a ionospheric correction to account for the signal time delay in the ionosphere. We propose using the International Reference Ionosphere (IRI) for the determination of this time delay. To investigate the effectiveness of an IRI correction, we have compared the IRI values with ionospheric corrections deduce from measurements by the dual-frequency Topex altimeter. By measuring at two frequencies, the Topex instrument can record (and thus eliminate) the ionospheric influence. We find that IRI agrees with the Topex data much better than the model that is currently used in Geosat data analysis. In particular the earlier model does not represent the equatorial double-peak (equator anomaly) clearly seen in the Topex data. Overall, the use of IRI results in a 30% improvement (over the older model) in the accuracy of ionospheric corrections computed for the first year of the Topex mission.


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    Titel :

    Using IRI for the computation of ionospheric corrections for altimeter data analysis


    Beteiligte:
    Bilitza, D. (Autor:in) / Koblinsky, C. (Autor:in) / Beckley, B. (Autor:in) / Zia, S. (Autor:in) / Williamson, R. (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    1995-02-01



    Medientyp :

    Sonstige


    Format :

    Keine Angabe


    Sprache :

    Englisch


    Schlagwörter :


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    Using GPS for ionospheric corrections of ESA tracking data

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    Using GPS for ionospheric corrections of ESA tracking data

    Feltens, J. | British Library Online Contents | 1997