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A maximum likelihood estimator to simultaneously unwrap, geocode and fuse SAR interferograms from different viewing geometries into one digital elevation model

Eineder, Michael und Adam, Nico (2005) A maximum likelihood estimator to simultaneously unwrap, geocode and fuse SAR interferograms from different viewing geometries into one digital elevation model. IEEE Transactions on Geoscience and Remote Sensing, 43 (1), Seiten 24-36.

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Kurzfassung

This paper presents theory, algorithm and results of a maximum likelihood algorithm that is capable to fuse a number of heterogeneous SAR interferograms into a single digital elevation model (DEM) without the need for the critical phase unwrapping step. The fusion process takes place in the object space, i.e. the map geometry, and considers the periodic likelihood function of each individual interferometric phase sample. The interferograms may vary regarding their radar wavelength, their baseline, their heading angle (ascending or descending) and their incidence angle. Geometric baseline error estimates and a-priori knowledge from other estimates like existing DEMs are incorporated seamlessly into the estimation process. The presented approach significantly differs from the standard DEM generation method where each interferogram is first phase unwrapped individually, then geocoded into a common map geometry and finally averaged with DEMs generated from other interferograms. By avoiding the phase unwrapping step the proposed algorithm does not depend on gradients between samples and is therefore capable to reconstruct the arbitrary height of each single scatterer. Because the height of each DEM sample is determined individually, spatial propagation of phase unwrapping errors is avoided. The algorithm is targeted to fuse an ensemble of interferometric multi-angle or multi-baseline observations in areas of rugged terrain or highly ambiguous data where algorithms based on phase unwrapping may fail. The algorithm is explained and examples with real data from the Shuttle Radar Topography Mission are given. Conditions of future mission are simulated and optimization criteria for the viewing geometry are discussed.

Dokumentart:Zeitschriftenbeitrag
Zusätzliche Informationen: LIDO-Berichtsjahr=2004,
Titel:A maximum likelihood estimator to simultaneously unwrap, geocode and fuse SAR interferograms from different viewing geometries into one digital elevation model
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Eineder, MichaelNICHT SPEZIFIZIERT
Adam, NicoNICHT SPEZIFIZIERT
Datum:2005
Erschienen in:IEEE Transactions on Geoscience and Remote Sensing
Referierte Publikation:Ja
In ISI Web of Science:Ja
Band:43
Seitenbereich:Seiten 24-36
Status:veröffentlicht
Stichwörter:Phase unwrapping, DEM reconstruction, SAR interferometry, multi-baseline
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W EO - Erdbeobachtung
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):NICHT SPEZIFIZIERT
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Methodik der Fernerkundung
Hinterlegt von: elib DLR-Beauftragter
Hinterlegt am:25 Jan 2006
Letzte Änderung:06 Jan 2010 22:31

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