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SRTM X-SAR Motion Compensation: Concept and First Assessment of the Interferometric Observation Geometry

Adam, Nico and Eineder, Michael and Breit, Helko (2001) SRTM X-SAR Motion Compensation: Concept and First Assessment of the Interferometric Observation Geometry. In: Prrceedings of IGARSS'01, Vol. 5, pp. 2034-2036. IGARSS, Sydney, 2001.

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Abstract

The space shuttle Endeavour that flew from 11 until 22 February carried the radar systems for the Shuttle Radar Topography Mission (SRTM). In the course of this project the first space born single pass interferometer has mapped the Earth’s topography. Two different radar systems operated on board of the space shuttle: the C-band radar of the American NASA/ JPL and the X-band radar of the German DLR and the Italian ASI. It is the objective of this mission to generate a digital elevation model (DEM) of the Earth with an accuracy that has never been reached before on this global scale. The inevitable technically caused oscillation of the secondary antenna turns this task into a scientific and technological challenge. The Synthetic Aperture Radar (SAR) observation is influenced by a resulting sensor motion in the line of sight. The consequence of this effect on the secondary SAR scene and subsequently on the DEM is described in this paper. To obtain the requested height accuracy in spite of the antenna oscillation, the principle of motion compensation is applied. The concept of this key algorithm in the X-SAR SRTM project is explained in detail. The essential parameters of the interferometric observation geometry were recorded by the Attitude and Orbit Determination Avionics (AODA) system of the JPL. These AODA data are employed to investigate the movement of the secondary antenna. The results of this analysis are presented together with its consequences on the processing scheme. In addition, the feasible DEM accuracy is evaluated depending on the concept of motion compensation and on the dynamics of the observation geometry.

Document Type:Conference or Workshop Item (Paper)
Additional Information: LIDO-Berichtsjahr=2002,
Title:SRTM X-SAR Motion Compensation: Concept and First Assessment of the Interferometric Observation Geometry
Authors:
AuthorsInstitution or Email of Authors
Adam, NicoUNSPECIFIED
Eineder, MichaelUNSPECIFIED
Breit, HelkoUNSPECIFIED
Date:2001
Journal or Publication Title:Prrceedings of IGARSS'01
Volume:Vol. 5
Page Range:pp. 2034-2036
Status:Published
Keywords:SRTM, InSAR, DEM, motion compensation
Event Title:IGARSS, Sydney, 2001
Organizer:IGARSS,
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):UNSPECIFIED
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute
Deposited By: Cornelia Roehl
Deposited On:25 Jan 2006
Last Modified:06 Jan 2010 22:13

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