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Inter-agency comparison of TanDEM-X baseline solutions

Jäggi, Adrian and Montenbruck, Oliver and Moon, Yongyin and Wermuth, Martin and König, Rolf and Michalak, Grzegorz and Bock, Heike and Bodenmann, D (2012) Inter-agency comparison of TanDEM-X baseline solutions. Advances in Space Research, 50 (2), pp. 260-271. Elsevier. DOI: 10.1016/j.asr.2012.03.027. ISSN 0273-1177.

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TanDEM-X (TerraSAR-X add-on for Digital Elevation Measurement) is the first Synthetic Aperture Radar (SAR) mission using close formation flying for bistatic SAR interferometry. The primary goal of the mission is to generate a global digital elevation model (DEM) with 2 m height precision and 10 m ground resolution from the configurable SAR interferometer with space baselines of a few hundred meters. As a key mission requirement for the interferometric SAR processing, the relative position, or baseline vector, of the two satellites must be determined with an accuracy of 1 mm (1D RMS) from GPS measurements collected by the onboard receivers. The operational baseline products for the TanDEM-X mission are routinely generated by the German Research Center for Geosciences (GFZ) and the German Space Operations Center (DLR/GSOC) using different software packages (EPOS/BSW, GHOST) and analysis strategies. For a further independent performance assessment, TanDEM-X baseline solutions are generated at the Astronomical Institute of the University of Bern (AIUB) on a best effort basis using the Bernese Software (BSW). Dual-frequency baseline solutions are compared for a 1-month test period in January 2011. Differences of reduced-dynamic baselinesolutions exhibit a representative standard deviation (STD) of 1 mm outside maneuver periods, while biases are below 1 mm in all directions. The achieved baseline determination performance is close to the mission specification, but independent SAR calibration data takes acquired over areas with a well known DEM from previous missions will be required to fully meet the 1 mm 1D RMS target. Besides the operational solutions, single-frequency baseline solutions are tested. They benefit from a more robust ambiguity fixing and show a slightly better agreement of below 1 mm STD, but are potentially affected by errors caused by an incomplete compensation of differential ionospheric path delays.

Document Type:Article
Title:Inter-agency comparison of TanDEM-X baseline solutions
AuthorsInstitution or Email of Authors
Jäggi, AdrianAIUB
Montenbruck, OliverUNSPECIFIED
Moon, YongyinGFZ
Wermuth, MartinUNSPECIFIED
König, RolfGFZ
Michalak, GrzegorzGFZ
Bock, HeikeAIUB
Bodenmann, DAIUB
Date:July 2012
Journal or Publication Title:Advances in Space Research
Refereed publication:Yes
In ISI Web of Science:Yes
Page Range:pp. 260-271
Keywords:TanDEM-X; Precise baseline determination (PBD); Inter-agency baseline comparison; Ambiguity fixing; GPS; SAR
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Projekt TerraSAR-X Missionsbetrieb (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Space Operations and Astronaut Training
Deposited By: Dr.rer.nat.hab. Oliver Montenbruck
Deposited On:02 Jul 2012 11:45
Last Modified:13 Jan 2014 09:30

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