A Space-Time Extension of the Minimum Cost Flow Phase Unwrapping Algorithm for DInSAR Time-Series Generation

Conference: EUSAR 2006 - 6th European Conference on Synthetic Aperture Radar
05/16/2006 - 05/18/2006 at Dresden, Germany

Proceedings: EUSAR 2006

Pages: 4Language: englishTyp: PDF

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Pepe, A. (Università degli Studi di Napoli Federico II – Dipartimento di Ingegneria Elettronica e delle Telecomunicazioni, via Claudio 21, 80125 Napoli, Italy)
Lanari, R. (Istituto per il Rilevamento Elettromagnetico dell’Ambiente, IREA – National Research Council of Italy (CNR),via Diocleziano 328, 80124 Napoli, Italy)

We propose in this work an extension of the Phase Unwrapping (PhU) minimum cost flow (MCF) algorithm that exploits both the spatial properties and the temporal relationships among a set of multiple Differential Synthetic Aperture Radar (DInSAR) interferograms, relevant to a properly chosen sequence of SAR images. The proposed approach relies on the use of two distinctive Delaunay triangulations: the former is relevant to the SAR data distribution in the “Temporal/Perpendicular baseline” plane, the latter is carried out in the Azimuth/Range plane and involves the coherent pixels common to the generated interferograms. In particular, the unwrapping operation of the overall data set is performed via a two-step processing procedure carried out by applying the basic minimum cost flow approach to the two different triangulations. In order to validate the algorithm, a number of experiments on real SAR data were accomplished; the obtained results demonstrate the effectiveness of the proposed PhU approach.