Detection of Arctic Ocean tides using interferometric GNSS-R signals

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 interfe...

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Bibliographic Details
Published in:Geophysical Research Letters
Main Authors: Semmling, Maximilian, Beyerle, Georg, Stosius, Ralf, Dick, Galina, Wickert, Jens, Fabra Cervellera, Fran, Cardellach, Estel, Ribó, Serni, Rius, Antonio, Helm, Achim, Yudanov, Sergei B., D'Addio, Salvatore
Format: Article in Journal/Newspaper
Language:English
Published: American Geophysical Union 2011
Subjects:
GNSS
Reflectometry
Sea-ice
Ocean tides
Arctic
Arctic Ocean
Greenland
Disko Bay
Sea ice
Online Access:http://hdl.handle.net/10261/37347
https://doi.org/10.1029/2010GL046005
Description
Summary: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. Peer reviewed

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