Next Article in Journal
A Novel Change Detection Approach for Multi-Temporal High-Resolution Remote Sensing Images Based on Rotation Forest and Coarse-to-Fine Uncertainty Analyses
Next Article in Special Issue
Multi-Sensor InSAR Analysis of Progressive Land Subsidence over the Coastal City of Urayasu, Japan
Previous Article in Journal
Understanding Long-Term Savanna Vegetation Persistence across Three Drainage Basins in Southern Africa
Previous Article in Special Issue
A Methodology to Detect and Characterize Uplift Phenomena in Urban Areas Using Sentinel-1 Data
Article

SAR Tomography as an Add-On to PSI: Detection of Coherent Scatterers in the Presence of Phase Instabilities

1
Chair of Earth Observation and Remote Sensing, ETH Zurich, 8093 Zurich, Switzerland
2
GAMMA Remote Sensing AG, CH-3073 Gümligen, Switzerland
3
Microwaves and Radar Institute, German Aerospace Center (DLR), 82234 Wessling, Germany
*
Authors to whom correspondence should be addressed.
Remote Sens. 2018, 10(7), 1014; https://doi.org/10.3390/rs10071014
Received: 28 April 2018 / Revised: 14 June 2018 / Accepted: 20 June 2018 / Published: 25 June 2018
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. View Full-Text
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 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
Show Figures

Graphical abstract

MDPI and ACS Style

Siddique, M.A.; Wegmüller, U.; Hajnsek, I.; Frey, O. SAR Tomography as an Add-On to PSI: Detection of Coherent Scatterers in the Presence of Phase Instabilities. Remote Sens. 2018, 10, 1014. https://doi.org/10.3390/rs10071014

AMA Style

Siddique MA, Wegmüller U, Hajnsek I, Frey O. SAR Tomography as an Add-On to PSI: Detection of Coherent Scatterers in the Presence of Phase Instabilities. Remote Sensing. 2018; 10(7):1014. https://doi.org/10.3390/rs10071014

Chicago/Turabian Style

Siddique, Muhammad A., Urs Wegmüller, Irena Hajnsek, and Othmar Frey. 2018. "SAR Tomography as an Add-On to PSI: Detection of Coherent Scatterers in the Presence of Phase Instabilities" Remote Sensing 10, no. 7: 1014. https://doi.org/10.3390/rs10071014

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop