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TanDEM-X: A New Satellite Mission for Deriving a Global DEM with Unprecedented Height Accuracy

Fiedler, Hauke and Krieger, Gerhard and Zink, Manfred and Eineder, Michael and Moreira, Alberto (2006) TanDEM-X: A New Satellite Mission for Deriving a Global DEM with Unprecedented Height Accuracy. Geodätische Woche, 2006-10-10 - 2006-10-12, München.

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Abstract

The TanDEM-X mission comprises two fully active synthetic aperture radar (SAR) X-band satellites, operating three years as a joint mission. The primary goal of this mission is the derivation of a high-precision global DEM according to HRTI level 3 quality. Also secondary mission goals shall be performed like e.g. digital beam-forming, along-track interferometry or bi-static experiments. The orbit control is based on the HELIX principle, an e/i-vector separation of the two satellites, enabling a safe and collision free operation of the spacecrafts. This formation is highly reconfigurable and allows many kinds of applications. To achieve the primary goal, a data acquisition strategy is derived, which proves the feasibility of a single global mapping of the Earth in approximately 1½ years. This strategy works as a reference scenario, which specifies for each orbit different possible data acquisitions at various latitudes with several incident angles. This is necessary to avoid data acquisition conflicts with the original TerraSAR-X mission. It is envisaged that each satellite covers 50 percent of the already planned TerraSAR-X mission, leaving enough monitoring time for the joint mission. For deriving such a highly accurate DEM, it is prerequisite that the baselines and their corresponding height of ambiguities correspond to the requirements of the HRTI-3 standard. Therefore, as the baselines vary with latitude and incident angle, the formation shall be adjusted such that each scene is monitored with an optimum baseline. Furthermore, it is shown that the required performance is achieved to meet the requirements of deriving a global DEM according to HRTI level 3 quality. Due to topographic influences, one data acquisition might not suffice for terrain with steep gradients; for such regions, additional monitoring time is allocated in a second mission phase. For these additional data acquisitions, the formation will be reconfigured. This second phase will last approximately one year, leaving enough time in this three year mission scenario for a third phase to allow for secondary mission goals like e.g. along-track interferometry, bi-static mapping or digital beamforming.

Document Type:Conference or Workshop Item (Speech)
Title:TanDEM-X: A New Satellite Mission for Deriving a Global DEM with Unprecedented Height Accuracy
Authors:
AuthorsInstitution or Email of Authors
Fiedler, HaukeUNSPECIFIED
Krieger, GerhardUNSPECIFIED
Zink, ManfredUNSPECIFIED
Eineder, MichaelUNSPECIFIED
Moreira, AlbertoUNSPECIFIED
Date:October 2006
Refereed publication:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:HRTI, Interferometry, TerraSAR-X, TanDEM-X, Performance, DTED, DEM
Event Title:Geodätische Woche
Event Location:München
Event Type:international Conference
Event Dates:2006-10-10 - 2006-10-12
Organizer:Deutscher Verein für Vermessungswesen (DVW)
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 - Vorhaben Entwicklung eines Mini-SAR (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute
Microwaves and Radar Institute
Microwaves and Radar Institute > Spaceborne SAR Systems
Microwaves and Radar Institute > SAR Technology
Deposited By: Dr. Hauke Fiedler
Deposited On:20 Oct 2006
Last Modified:27 Apr 2009 13:08

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