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Very High Resolution Spaceborne SAR Tomography in Urban Environment

Zhu, Xiao Xiang and Bamler, Richard (2010) Very High Resolution Spaceborne SAR Tomography in Urban Environment. IEEE Transactions on Geoscience and Remote Sensing, 48 (12), pp. 4296-4308. DOI: 10.1109/TGRS.2010.2050487. ISSN 0196-2892.

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Official URL: http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=5497277&tag=1


SAR tomography (TomoSAR) extends the synthetic aperture principle into the elevation direction for 3-D imaging. It uses stacks of several acquisitions from slightly different viewing angles (the elevation aperture) to reconstruct the reflectivity function along the elevation direction by means of spectral analysis for every azimuth-range pixel. The new class of meter-resolution spaceborne SAR systems (TerraSAR-X and COSMO-Skymed) offers a tremendous improvement in tomographic reconstruction of urban areas and man-made infrastructure. The high resolution fits well to the inherent scale of buildings (floor height, distance of windows, etc.). This paper demonstrates the tomographic potential of theses SARs and the achievable quality on the basis of TerraSAR-X spotlight data of urban environment. A new Wiener-type regularization to the Singular Value Decomposition (SVD) method � equivalent to a MAP estimator � for TomoSAR is introduced and is extended to the differential (4-D, i.e. space-time). Different model selection schemes for the estimation of the number of scatterers in a resolution cell are compared and proven to be applicable in practice. Two parametric estimation algorithms of the scatterers' elevation and their velocities are evaluated. First 3-D and 4-D reconstructions of an entire building complex (incl. its radar reflectivity) with very high level of detail from space-borne SAR data by pixel-wise TomoSAR are presented.

Document Type:Article
Title:Very High Resolution Spaceborne SAR Tomography in Urban Environment
AuthorsInstitution or Email of Authors
Zhu, Xiao XiangDLR-IMF/TUM-LMF
Bamler, RichardDLR-IMF/TUM-LMF
Journal or Publication Title:IEEE Transactions on Geoscience and Remote Sensing
Refereed publication:Yes
In Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 4296-4308
Keywords:SAR tomography, differential SAR tomography, urban mapping, spotlight SAR, TerraSAR-X
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben hochauflösende Fernerkundungsverfahren
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > SAR Signal Processing
Deposited By: Xiao Xiang Zhu
Deposited On:25 Oct 2010 13:17
Last Modified:12 Dec 2013 20:45

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