Geodetic SAR Tomography

Journal article (2016)

Authors

Xiao Xiang Zhu Technische Universität München

Sina Montazeri Deutsches Zentrum für Luft- und Raumfahrt (DLR)

Christoph Gisinger Technische Universität München

R.F. Hanssen Mathematical Geodesy and Positioning -

Richard Bamler Technische Universität München

Research Group

Mathematical Geodesy and Positioning () (TU Delft)

DOI: https://doi.org/10.1109/TGRS.2015.2448686

Synthetic aperture radar (SAR) TerraSAR-X Absolute positioning Geodetic SAR tomography Geodetical fusion SAR geodesy SAR tomography Stereo SAR

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Published Date

01-01-2016

Language

English

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Faculty

Civil Engineering & Geosciences

Department

Geoscience and Remote Sensing

Research Group

Mathematical Geodesy and Positioning

Abstract

In this paper, we propose a framework referred to as 'geodetic synthetic aperture radar (SAR) tomography' that fuses the SAR imaging geodesy and tomographic SAR inversion (TomoSAR) approaches to obtain absolute 3-D positions of a large amount of natural scatterers. The methodology is applied on four very high resolution TerraSAR-X spotlight image stacks acquired over the city of Berlin. Since all the TomoSAR estimates are relative to the same reference point object whose absolute 3-D positions are retrieved by means of stereo SAR, the point clouds reconstructed using data acquired from different viewing angles can be geodetically fused. To assess the accuracy of the position estimates, the resulting absolute shadow-free 3-D TomoSAR point clouds are compared with a digital surface model obtained by airborne LiDAR. It is demonstrated that an absolute positioning accuracy of around 20 cm and a meter-order relative positioning accuracy can be achieved by the proposed framework using TerraSAR-X data.

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