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

Romeiser, Roland und Breit, Helko und Eineder, Michael und Runge, Hartmut und Flamant, Pierre und de Jong, Karin und 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), Seiten 2315-2324.

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Kurzfassung

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

Dokumentart:Zeitschriftenbeitrag
Zusätzliche Informationen: LIDO-Berichtsjahr=2005,
Titel:Current Measurements by SAR Along-Track Interferometry from a Space Shuttle
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Romeiser, RolandUni Hamburg, Inst. of Oceanography
Breit, HelkoNICHT SPEZIFIZIERT
Eineder, MichaelNICHT SPEZIFIZIERT
Runge, HartmutNICHT SPEZIFIZIERT
Flamant, PierreUniversity of Hawaii
de Jong, KarinKNMI
Vogelzang, JurKNMI
Datum:2005
Erschienen in:IEEE Transactions on Geoscience and Remote Sensing
Referierte Publikation:Ja
In ISI Web of Science:Ja
Band:Vol. 43
Seitenbereich:Seiten 2315-2324
Status:veröffentlicht
Stichwörter:Current Measurements, interferometric synthetic aperture radar (InSAR), Shuttle Radar Topography Mission (SRTM)
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W EO - Erdbeobachtung
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):NICHT SPEZIFIZIERT
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Methodik der Fernerkundung
Hinterlegt von: Cornelia Roehl
Hinterlegt am:09 Mai 2006
Letzte Änderung:14 Jan 2010 19:58

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