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Theoretical Evaluation of Several Possible Along-Track InSAR Modes of TerraSAR-X for Ocean Current Measurements

Romeiser, Roland and Runge, Hartmut (2007) Theoretical Evaluation of Several Possible Along-Track InSAR Modes of TerraSAR-X for Ocean Current Measurements. IEEE Transactions on Geoscience and Remote Sensing, Vol. 4 (NO. 1), pp. 21-35. IEEE GRS.

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Abstract

The German satellite TerraSAR-X, scheduled for launch in early 2007, will permit high-resolution ocean current measurements by along-track interferometric SAR (along-track InSAR) in various experimental modes of operation, using different subsections of its X-band SAR antenna array with a total length of 4.8 m as individual receive antennas. Depending on antenna and receive chain settings, effective InSAR time lags of about 0.17 to 0.29 ms can be realized in combination with different noise levels, single-look resolutions, swath widths, and incidence angles. We give an overview of the characteristics of the possible InSAR modes and evaluate their suitability for current measurements on the basis of simulated data products. Our results indicate that the quality of interferometric stripmap data from TerraSAR-X will be clearly superior to the quality of existing data acquired over the Dutch coast during the Shuttle Radar Topography Mission (SRTM); accurate current retrievals can be expected at effective spatial resolutions on the order of 500 m. However, in modes using a multiplexed single receive chain, the effective swath width of stripmap data will be limited to only 15 km, while dual receive chain operation offers a swath width of 30 km for stripmap data and promises a reasonable data quality even for ScanSAR data with a maximum swath width of 100 km. Finally, we consider fundamental relations between along-track baseline, instrument noise, and resulting InSAR phase noise to discuss the potential for current measuring performance improvements of TerraSAR-X follow-on satellites.

Document Type:Article
Additional Information:©2007 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Title:Theoretical Evaluation of Several Possible Along-Track InSAR Modes of TerraSAR-X for Ocean Current Measurements
Authors:
AuthorsInstitution or Email of Authors
Romeiser, RolandUniversität Hamburg, Institut für Meereskunde
Runge, HartmutUNSPECIFIED
Date:January 2007
Journal or Publication Title:IEEE Transactions on Geoscience and Remote Sensing
Volume:Vol. 4
Page Range:pp. 21-35
Publisher:IEEE GRS
Status:Published
Keywords:Along-track interferometry (ATI), current measurements, Interferometric synthetic aperture radar (InSAR), TerraSAR-X
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:V SM - Sicherung der Mobilität (old)
DLR - Research area:Transport
DLR - Program:V SM - Sicherung der Mobilität
DLR - Research theme (Project):V - TS-X Verkehrsprodukte (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute
Remote Sensing Technology Institute > SAR Signal Processing
Deposited By: Hartmut Runge
Deposited On:23 Jan 2008
Last Modified:12 Dec 2013 20:22

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