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Current Measurements by SAR Along-Track Interferometry from a Space Shuttle

Romeiser, Roland and Breit, Helko and Eineder, Michael and Runge, Hartmut and Flamant, Pierre and de Jong, Karin and Vogelzang, Jur (2005) Current Measurements by SAR Along-Track Interferometry from a Space Shuttle. IEEE Transactions on Geoscience and Remote Sensing, Vol. 43 (No. 10), pp. 2315-2324.

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We present one of the first studies on ocean current retrievals from interferometric synthetic aperture radar (InSAR) data acquired during the Shuttle Radar Topography Mission (SRTM) in February 2000. The InSAR system of SRTM was designed for high-resolution topographic mapping of the Earth’s land surfaces, using two SAR antennas on a Space Shuttle with a cross-track separation of 60 m. An additional along-track antenna separation of 7 m resulted in an effective time lag of about 0.5 ms between the two images, which could theoretically be exploited for target velocity retrievals. However, the feasibility of ocean current measurements with SRTM has been questionable, since the time lag was much shorter than the theoretical optimum (about 3 ms at X-band) and the signal-to-noise ratio over water was quite low. Nevertheless, some X-band InSAR images of coastal areas exhibit clear signatures of tidal flow patterns. As an example, we discuss an image of the DutchWadden Sea.We convert the InSAR data into a line-of-sight current field, which is then compared with results of the numerical circulation model KUSTWAD. For tidal phases close to the conditions at the time of the SRTM overpass; we obtain correlation coefficients of up to 0.6 and rms differences on the order of 0.2 m/s. Furthermore we find that SRTM resolves current variations down to spatial scales on the order of 1 km. This is consistent with predictions of a numerical InSAR imaging model. Remaining differences between SRTMand KUSTWAD-derived currents can be attributed mainly to residual motion errors in the SRTM data as well as to a limited representation of the conditions at the time of the SRTM overpass in the available KUSTWAD results

Item URL in elib:https://elib.dlr.de/19134/
Document Type:Article
Additional Information: LIDO-Berichtsjahr=2005,
Title:Current Measurements by SAR Along-Track Interferometry from a Space Shuttle
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Romeiser, RolandUni Hamburg, Inst. of OceanographyUNSPECIFIED
Flamant, PierreUniversity of HawaiiUNSPECIFIED
Journal or Publication Title:IEEE Transactions on Geoscience and Remote Sensing
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Volume:Vol. 43
Page Range:pp. 2315-2324
Keywords:Current Measurements, interferometric synthetic aperture radar (InSAR), Shuttle Radar Topography Mission (SRTM)
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):UNSPECIFIED
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute
Deposited By: Roehl, Cornelia
Deposited On:09 May 2006
Last Modified:14 Jan 2010 19:58

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