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Design Principles and Considerations for Spaceborne ATI SAR-Based Observations of Ocean Surface Velocity Vectors

Wollstadt, Steffen and Lopez-Dekker, Paco and De Zan, Francesco and Younis, Marwan (2017) Design Principles and Considerations for Spaceborne ATI SAR-Based Observations of Ocean Surface Velocity Vectors. IEEE Transactions on Geoscience and Remote Sensing, 55 (8), pp. 4500-4519. IEEE - Institute of Electrical and Electronics Engineers. doi: 10.1109/TGRS.2017.2692880. ISSN 0196-2892.

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


This paper presents a methodology to design a spaceborne dual-beam along-track synthetic aperture radar interferometer to retrieve ocean surface velocity vectors. All related aspects and necessary tradeoffs are identified and discussed or reviewed, respectively. This includes a review of the measurement principle and the relation between baseline and sensitivity, the relation between wind and radar backscatter, a discussion of the observation geometry, including the antenna concept, polarization diversity, and all main error contributions. The design methodology consists of a sensitivity-based derivation of explicit instrument requirements from scientific requirements. In turn, this derivation is based on a statistical model for the interferometric phase error. This allows a quantitative, wellgrounded instrument design offering an additional degree of freedom to the approach, which we call "noise-equivalent-sigmazero requirement space." Crucial tradeoffs for the system design, such as the resolution, the number of independent looks, the minimum wind speed, and the coherence and ambiguities, are pointed out and discussed. Finally, this paper concludes with a single platform system concept operating in Ku-band, which provides the measurement quality needed to achieve a surface velocity estimation accuracy of 5 cm/s, 200 km swath coverage, for 4x4 km2 L2-product resolution and winds starting at 3 m/s.

Item URL in elib:https://elib.dlr.de/114361/
Document Type:Article
Additional Information:©2017 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:Design Principles and Considerations for Spaceborne ATI SAR-Based Observations of Ocean Surface Velocity Vectors
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Wollstadt, SteffenUNSPECIFIEDhttps://orcid.org/0000-0003-3602-762XUNSPECIFIED
Lopez-Dekker, Pacodelft university of technologyUNSPECIFIEDUNSPECIFIED
Younis, MarwanUNSPECIFIEDhttps://orcid.org/0000-0002-8563-7371UNSPECIFIED
Date:August 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
Page Range:pp. 4500-4519
Publisher:IEEE - Institute of Electrical and Electronics Engineers
Keywords:Along-track interferometric (ATI), dual-beam interferometry, ocean surface velocity measurement, spaceborne mission design, synthetic aperture radar (SAR)
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 - SAR Expert Support Lab
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute > Radar Concepts
Microwaves and Radar Institute
Remote Sensing Technology Institute > SAR Signal Processing
Deposited By: Wollstadt, Steffen
Deposited On:25 Sep 2017 12:19
Last Modified:08 Mar 2018 18:35

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