Physics
Scientific paper
Feb 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3804103s&link_type=abstract
Geophysical Research Letters, Volume 38, Issue 4, CiteID L04103
Physics
2
Cryosphere: Remote Sensing, Cryosphere: Sea Ice (4540), Geodesy And Gravity: Instruments And Techniques, Radio Science: Interferometry (1207, 1209, 1242), Radio Science: Radio Wave Propagation
Scientific paper
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.
Beyerle Georg
Cardellach Estel
d'Addio S.
Dick Galina
Fabra F.
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