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Differential Geodetic Stereo SAR with TerraSAR-X by Exploiting Small Multi-Directional Radar Reflectors

Gisinger, Christoph and Willberg, Martin and Balss, Ulrich and Klügel, Thomas and Mähler, Swetlana and Pail, Roland and Eineder, Michael (2017) Differential Geodetic Stereo SAR with TerraSAR-X by Exploiting Small Multi-Directional Radar Reflectors. Journal of Geodesy, 91 (1), pp. 53-67. Springer. doi: 10.1007/s00190-016-0937-2. ISSN 0949-7714.

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Official URL: http://link.springer.com/article/10.1007/s00190-016-0937-2


In this paper, we report on the direct positioning of small multi-directional radar reflectors, so-called octahedrons, with the Synthetic Aperture Radar (SAR) satellite TerraSAR-X. Its highest-resolution imaging mode termed Staring Spotlight enables the use of such octahedron reflectors with a dimension of only half a meter, but still providing backscatter equivalent to 1-2 cm observation accuracy. Four octahedrons were deployed at Wettzell geodetic observatory, and observed by TerraSAR-X with twelve acquisitions in three different geometries. By applying our least squares Stereo SAR algorithm already tested with common trihedral corner reflectors (CRs), and introducing a novel differential extension using one octahedron as reference point, the coordinates of the remaining octahedrons were directly retrieved in the International Terrestrial Reference Frame (ITRF). Contrary to our standard processing, the differential approach does not require external corrections for the atmospheric path delays and the geodynamic displacements, rendering it particularly useful for joint geodetic networks employing SAR and GNSS. In the paper, we present and discuss both methods based on the aforementioned Wettzell data set of the octahedrons. The comparison with the independently determined reference coordinates confirms the positioning accuracy with 2-5 cm for the standard approach, and 2-3 cm for the differential processing. Moreover, we present statistical uncertainty estimates of the observations and the positioning solutions, which are additionally provided by our parameter estimation algorithms. The results also include our 1.5 m CR available at Wettzell, and the outcomes clearly demonstrate the advantage of the multi-directional octahedrons over conventional CRs for global positioning applications with SAR.

Item URL in elib:https://elib.dlr.de/103399/
Document Type:Article
Title:Differential Geodetic Stereo SAR with TerraSAR-X by Exploiting Small Multi-Directional Radar Reflectors
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Balss, Ulrichulrich.balss (at) dlr.deUNSPECIFIED
Klügel, ThomasFederal Agency for Cartography and Geodesy, Germany, kluegel (at) fs.wettzell.deUNSPECIFIED
Mähler, SwetlanaFederal Agency for Cartography and Geodesy, GermanyUNSPECIFIED
Eineder, Michaelmichael.eineder (at) dlr.deUNSPECIFIED
Date:January 2017
Journal or Publication Title:Journal of Geodesy
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1007/s00190-016-0937-2
Page Range:pp. 53-67
EditorsEmailEditor's ORCID iD
Kusche, Jürgenkusche@uni-bonn.deUNSPECIFIED
Keywords:Synthetic Aperture Radar (SAR), Stereo SAR, Differential Positioning, 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 - Earth Observation
DLR - Research theme (Project):R - Vorhaben hochauflösende Fernerkundungsverfahren (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > SAR Signal Processing
Deposited By: Balss, Dr. Ulrich
Deposited On:14 Mar 2016 08:55
Last Modified:13 Jan 2017 12:41

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