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SAR tomography as an add-On to PSI: Detection of coherent scatterers in the presence of phase instabilities

Siddique, Muhammad Adnan and Wegmuller, Urs and Hajnsek, Irena and Frey, Othmar (2018) SAR tomography as an add-On to PSI: Detection of coherent scatterers in the presence of phase instabilities. Remote Sensing, 10 (7). Multidisciplinary Digital Publishing Institute (MDPI). doi: 10.3390/rs10071014. ISSN 2072-4292.

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The estimation of deformation parameters using persistent scatterer interferometry (PSI) is limited to single dominant coherent scatterers. As such, it rejects layovers wherein multiple scatterers are interfering in the same range-azimuth resolution cell. Differential synthetic aperture radar (SAR) tomography can improve deformation sampling as it has the ability to resolve layovers by separating the interfering scatterers. In this way, both PSI and tomography inevitably require a means to detect coherent scatterers, i.e., to perform hypothesis testing to decide whether a given candidate scatterer is coherent. This paper reports the application of a detection strategy in the context of “tomography as an add-on to PSI”. As the performance of a detector is typically linked to the statistical description of the underlying mathematical model, we investigate how the statistics of the phase instabilities in the PSI analysis are carried forward to the subsequent tomographic analysis. While phase instabilities in PSI are generally modeled as an additive noise term in the interferometric phase model, their impact in SAR tomography manifests as a multiplicative disturbance. The detection strategy proposed in this paper allows extending the same quality considerations as used in the prior PSI processing (in terms of the dispersion of the residual phase) to the subsequent tomographic analysis. In particular, the hypothesis testing for the detection of coherent scatterers is implemented such that the expected probability of false alarm is consistent between PSI and tomography. The investigation is supported with empirical analyses on an interferometric data stack comprising 50 TerraSAR-X acquisitions in stripmap mode, over the city of Barcelona, Spain, from 2007–2012

Item URL in elib:https://elib.dlr.de/123625/
Document Type:Article
Title:SAR tomography as an add-On to PSI: Detection of coherent scatterers in the presence of phase instabilities
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Date:June 2018
Journal or Publication Title:Remote Sensing
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:Yes
Publisher:Multidisciplinary Digital Publishing Institute (MDPI)
Keywords:synthetic aperture radar (SAR); SAR tomography; deformation monitoring; persistent scatterer interferometry (PSI); urban deformation monitoring; radar interferometry; displacement mapping; spaceborne SAR; differential interferometry; differential tomography
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 - Security-relevant Earth Observation
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute > Radar Concepts
Deposited By: Radzuweit, Sibylle
Deposited On:26 Nov 2018 09:49
Last Modified:14 Dec 2019 04:26

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