Detection of Arctic Ocean tides using interferometric GNSS-R signals

A. M. Semmling, G. Beyerle, R. Stosius, G. Dick, J. Wickert, F. Fabra, E. Cardellach, S. Ribó, A. Rius, A. Helm, S. B. Yudanov, S. D'Addio

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    60 Citations (Scopus)


    This paper evaluates the usage of reflected GPS signals for Earth observations to study changes of sea level and sea-ice in remote sensing. In a coastal setup, ∼670 m above Disko Bay (Greenland), signals with different carriers L1 and L2 were recorded. A method is presented that analyses the interferometric phase between the reflected and the direct signals and derives the height of the reflecting surface. The analysis includes a ray tracing and an estimation of signal coherence. It is shown that coherent reflections are related to sea-ice coverage. Absolute heights are derived with a time interval of ∼30 min. The altimetric results show semidiurnal tides that are validated using the AODTM-5 tide model. The residual height has a mean of 9.7 cm for L1 and 22.9 cm for L2. The dispersion is not significant but a significant tropospheric bias is detected with an error of up to 20 cm. Copyright © 2011 by the American Geophysical Union.
    Original languageEnglish
    Article numberL04103
    JournalGeophysical Research Letters
    Issue number4
    Publication statusPublished - 1 Feb 2011


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