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Performance of 3-D Surface Deformation Estimation for Simultaneous Squinted SAR Acquisitions

Prats-Iraola, Pau and Lopez-Dekker, Paco and De Zan, Francesco and Yague-Martinez, Nestor and Zonno, Mariantonietta and Rodriguez-Cassola, Marc (2018) Performance of 3-D Surface Deformation Estimation for Simultaneous Squinted SAR Acquisitions. IEEE Transactions on Geoscience and Remote Sensing, 56 (4), pp. 2147-2158. IEEE - Institute of Electrical and Electronics Engineers. doi: 10.1109/TGRS.2017.2776140. ISSN 0196-2892.

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Official URL: http://www.grss-ieee.org/menu.taf?menu=publications&detail=tgars


This paper addresses the performance in the retrieval of 3-D mean deformation maps by exploiting simultaneous or quasi-simultaneous squinted synthetic aperture radar (SAR) interferometric acquisitions in a repeat-pass scenario. In multi-satellite or multi-beam low Earth observation (LEO) missions the availability of two (or more) lines of sight allows the simultaneous acquisition of SAR images with different squint angles, hence improving the sensitivity to the north-south component of the deformation. Due to the simultaneity of the acquisitions, the troposphere will be highly correlated and, therefore, will tend to cancel out when performing the differential measurement between the interferograms obtained with the different lines of sight, hence resulting in a practically troposphere-free estimation of the along-track deformation measurement. In practice, though, the atmospheric noise in the differential measurement will increase for increasing angular separations. The present contribution expounds the mathematical framework to derive the performance by properly considering the correlation of the atmospheric delays between the simultaneous acquisitions. To that aim, the hybrid Cramér-Rao bound is exploited making use of the autocorrelation function of the troposphere. Some performance examples are presented in the frame of future spaceborne SAR missions at C- and L-band.

Item URL in elib:https://elib.dlr.de/116105/
Document Type:Article
Additional Information:©2018 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:Performance of 3-D Surface Deformation Estimation for Simultaneous Squinted SAR Acquisitions
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Prats-Iraola, PauUNSPECIFIEDhttps://orcid.org/0000-0002-7583-2309UNSPECIFIED
Lopez-Dekker, Pacodelft university of technologyUNSPECIFIEDUNSPECIFIED
Zonno, MariantoniettaUNSPECIFIEDhttps://orcid.org/0000-0001-9537-1899UNSPECIFIED
Date:April 2018
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. 2147-2158
Publisher:IEEE - Institute of Electrical and Electronics Engineers
Keywords:Synthetic aperture radar (SAR), differential SAR interferometry (DInSAR), hybrid Cramér-Rao bound, squinted SAR acquisitions, troposphere, atmospheric boundary layer
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 - Aircraft SAR
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute > SAR Technology
Microwaves and Radar Institute > Radar Concepts
Remote Sensing Technology Institute > SAR Signal Processing
Deposited By: Prats, Dr. Pau
Deposited On:29 Nov 2017 09:30
Last Modified:12 Oct 2018 09:44

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