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Quality Assessment of Surface Current Fields From TerraSAR-X and TanDEM-X Along-Track Interferometry and Doppler Centroid Analysis

Romeiser, Roland and Runge, Hartmut and Suchandt, Steffen and Kahle, Ralph and Rossi, Cristian and Bell, Paul (2014) Quality Assessment of Surface Current Fields From TerraSAR-X and TanDEM-X Along-Track Interferometry and Doppler Centroid Analysis. IEEE Transactions on Geoscience and Remote Sensing, 52 (5), pp. 2759-2772. IEEE - Institute of Electrical and Electronics Engineers. doi: 10.1109/TGRS.2013.2265659. ISSN 0196-2892.

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All existing examples of current measurements by spaceborne synthetic aperture radar (SAR) along-track interferometry (ATI) have suffered from short baselines and corresponding low sensitivities. Theoretically, the best data quality at X band is expected at effective baselines on the order of 30 m, i.e. 30 times as long as the baselines of the divided-antenna modes of TerraSAR-X. In early 2012, we had a first opportunity to obtain data at near-optimum baselines from the TanDEM-X satellite formation. In this paper we analyze two TanDEM-X interferograms acquired over the Pentland Firth (Scotland) with effective alongtrack baselines of 25 m and 40 m. For comparison we consider a TerraSAR-X Dual Receive Antenna mode interferogram with an effective baseline of 1.15 m, as well as velocity fields obtained from Doppler centroid analysis (DCA) of single-antenna data from the same scenes. We show that currents derived from the TanDEM-X interferograms have a residual noise level of 0.1 m/s at an effective resolution of about 33m × 33 m, while DRA-mode data must be averaged over 1000m × 1000 m to reach the same level of accuracy. A comparison with reference currents from a 1 km-resolution tide computation system shows good agreement in all three cases. The DCA-based currents are found to be less accurate than the ATIbased ones, but close to short-baseline ATI results in quality. We conclude that DCA is a considerable alternative to divided-antenna mode ATI, while our TanDEM-X results demonstrate the true potential of the ATI technique at near-optimum baselines.

Item URL in elib:https://elib.dlr.de/81330/
Document Type:Article
Title:Quality Assessment of Surface Current Fields From TerraSAR-X and TanDEM-X Along-Track Interferometry and Doppler Centroid Analysis
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Romeiser, RolandUniversity of Miami, RSMAS, USAUNSPECIFIED
Runge, Hartmuthartmut.runge (at) dlr.deUNSPECIFIED
Suchandt, Steffensteffen.suchandt (at) dlr.deUNSPECIFIED
Kahle, Ralphralph.kahle (at) dlr.deUNSPECIFIED
Rossi, Cristiancristian.rossi (at) dlr.deUNSPECIFIED
Bell, Paulpsb (at) noc.ac.ukUNSPECIFIED
Date:May 2014
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
DOI :10.1109/TGRS.2013.2265659
Page Range:pp. 2759-2772
Publisher:IEEE - Institute of Electrical and Electronics Engineers
Keywords:Synthetic aperture radar, Interferometry, Radar velocity measurement, Remote sensing
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - Projekt TanDEM-X (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Space Operations and Astronaut Training > Space Flight Technology
Remote Sensing Technology Institute > SAR Signal Processing
Deposited By: Runge, Hartmut
Deposited On:01 Mar 2013 11:42
Last Modified:08 Mar 2018 18:34

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