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, pp. 260-271. Elsevier. DOI: 10.1016/j.asr.2012.03.027.
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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.
|Title:||Inter-agency comparison of TanDEM-X baseline solutions|
|Journal or Publication Title:||Advances in Space Research|
|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|
|HGF - Program:||Space|
|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)|
|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:||07 Feb 2013 20:13|
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