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First Analysis of TerraSAR-X Along-Track InSAR-Derived Current Fields

Romeiser, Roland and Suchandt, Steffen and Runge, Hartmut and Steinbrecher, Ulrich and Grünler, Stefan (2010) First Analysis of TerraSAR-X Along-Track InSAR-Derived Current Fields. IEEE Transactions on Geoscience and Remote Sensing, Volume 48 (Issue 2), pp. 820-829. IEEE Geoscience and Remote Sensing Society. DOI: 10.1109/TGRS.2009.2030885.

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Official URL: http://ieeexplore.ieee.org

Abstract

We present the first analysis of surface current fields derived from TerraSAR-X along-track interferometric synthetic aperture radar (along-track InSAR, ATI) data. The images were acquired over the mouth of the Elbe river (Germany) during six satellite overpasses in spring and summer 2008, using the experimental “aperture switching” mode of TerraSAR-X. In this mode, the phased-array synthetic aperture radar (SAR) antenna is split into two halves for receiving, but in contrast to the “dual receive antenna” mode, which uses two independent receivers inparallel, a single receiver is multiplexed to process signals from the two antenna halves in an alternating manner at a doubled pulse repetition frequency. The effective ATI baseline is on the order of 0.8 m. The SAR/ATI raw data processing is described in another paper in this issue. This paper focuses on the conversion of the basic interferograms into line-of-sight surface current fields, which includes an elimination of ship signatures, identification, and correction (as far as possible) of imaging artifacts, additional filtering and smoothing, and a subtraction of contributions of wave motions to detected velocities according to a theoretical model. We evaluate the quality of the results by comparison with current fields from a numerical flow model and with available in situ data. The ATI performance of TerraSAR-X is found to be basically consistent with theoretical expectations. After applying the same data processing algorithms to all six images, mean differences betwee TerraSAR-X-derived currents and reference currents in our main test area range from−0.11 to+0.08 m/s in five of the six cases with one outlier at +0.42 m/s. The spatial current variations within the TerraSAR-X-derived current fields are consistent with the model in three cases, but unrealistically strong variations across the images are found in the other three cases. We attribute this to shortcomings of our preliminary raw data processing algorithms, which can probably be fixed after some more detailed analysis and testing. The results obtained so far encourage us to believe that our internal performance goal of a typical currentmeasuring accuracy of 0.1 m/s at an effective spatial resolution better than 1 km can be met.

Document Type:Article
Title:First Analysis of TerraSAR-X Along-Track InSAR-Derived Current Fields
Authors:
AuthorsInstitution or Email of Authors
Romeiser, RolandUniversity of Miami
Suchandt, SteffenGerman Aerospace Center (DLR)
Runge, HartmutGerman Aerospace Center (DLR)
Steinbrecher, UlrichGerman Aerospace Center (DLR)
Grünler, StefanUniversity of Hamburg
Date:February 2010
Journal or Publication Title:IEEE Transactions on Geoscience and Remote Sensing
Refereed publication:Yes
In Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:Volume 48
DOI:10.1109/TGRS.2009.2030885
Page Range:pp. 820-829
Editors:
EditorsEmail
Ruf, Christopher S.cruf@umich.edu
Publisher:IEEE Geoscience and Remote Sensing Society
Series Name:IEEE Transactions and Geoscience and Remote Sensing
Status:Published
Keywords:Current measurement, interferometry, radar data processing, radar imaging, radar signal analysis, radar velocity measurement, rivers, synthetic aperture radar
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W - no assignement
DLR - Research area:Space
DLR - Program:W - no assignement
DLR - Research theme (Project):W -- no assignement (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute > Spaceborne SAR Systems
Remote Sensing Technology Institute > SAR Signal Processing
Deposited By: Steffen Suchandt
Deposited On:05 Feb 2010 15:38
Last Modified:26 Mar 2013 13:12

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