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X-Band Sea Surface Coherence Time Inferred from Bi-static SAR Interferometry

Suchandt, Steffen and Romeiser, Roland (2017) X-Band Sea Surface Coherence Time Inferred from Bi-static SAR Interferometry. IEEE Transactions on Geoscience and Remote Sensing, 55 (7), pp. 3941-3948. IEEE - Institute of Electrical and Electronics Engineers. doi: 10.1109/TGRS.2017.2684259. ISSN 0196-2892.

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Official URL: http://ieeexplore.ieee.org/document/7906478/


Coherence time plays an important role in ocean surface observation by means of synthetic aperture radar (SAR). For X-band, the auto-correlation function of the backscatter from the sea surface has been predicted using models. Up to now there exist only few experimental data and an empirical analysis of the sea surface coherence time based on a larger amount of data is missing. In this paper we show how space-based bi-static SAR along-track interferometry is used for the first time to measure the auto-correlation function. We achieve this by statistical analysis of the interferometric scene coherence as a function of the along-track interferometric time lag, instead of indirect estimation from the Doppler bandwidth. We use many data acquisitions of opportunity for that purpose, thereby exploiting the diversity of along-track baselines between the two SAR sensors of the TanDEM-X satellite formation. The auto-correlation function is related to the temporal decorrelation, which is not directly observable. We extract this component by quantifying and compensating for all other sources of decorrelation that contribute to the observed coherence.

Item URL in elib:https://elib.dlr.de/111540/
Document Type:Article
Title:X-Band Sea Surface Coherence Time Inferred from Bi-static SAR Interferometry
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Suchandt, Steffensteffen.suchandt (at) dlr.dehttps://orcid.org/0000-0001-6797-326X
Romeiser, Rolanduniversity of miamiUNSPECIFIED
Date:24 April 2017
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.2017.2684259
Page Range:pp. 3941-3948
EditorsEmailEditor's ORCID iD
Plaza, Antonio J.aplaza@unex.esUNSPECIFIED
Publisher:IEEE - Institute of Electrical and Electronics Engineers
Series Name:IEEE Transactions on Geoscience and Remote Sensing
Keywords:X-Band, Sea Surface Coherence Time, Bi-static SAR Along-Track Interferometry, TanDEM-X
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 - Vorhaben Tandem-L Vorstudien (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > SAR Signal Processing
Deposited By: Suchandt, Steffen
Deposited On:21 Mar 2017 09:22
Last Modified:08 Mar 2018 18:35

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