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TerraSAR-X SAR Data Processing

Breit, Helko and Fritz, Thomas and Balss, Ulrich and Niedermeier, Andreas and Lachaise, Marie and Schättler, Birgit (2008) TerraSAR-X SAR Data Processing. Committee on Earth Observation Satellites (CEOS), 2008-11-27 - 2008-11-28, Oberpfaffenhofen, Germany.

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Abstract

The TerraSAR-X Mission started operational provision of SAR image products to the scientific and commercial user community in January 2008. An essential prerequisite for the excellent quality of the SAR products was the successful execution of a comprehensive commissioning phase (CP) in 2007. Here, the complete SAR system which comprises instrument commanding, instrument SAR data acquisition as well as SAR processing has been characterized, calibrated and verified. Finally SAR image product verification ensured that the product performance parameters are within the specification. Besides the versatile high-resolution X-Band SAR instrument in space, featuring Stripmap, ScanSAR and Spotlight imaging modes in different polarizations, the TerraSAR Multi-Mode SAR Processor (TMSP) is the central part of the ground segment. Most instrument and SAR calibration parameters have been derived on basis of SAR image products generated by the TMSP. Therefore, already in the beginning of the CP the products had to be relatively radiometric calibrated and geometrical undistorted. An indispensable prerequisite for this was the imaging mode independent normalization of the processor gain as well as the incorporation of external information, i.e. a digital elevation model for the projection of the elevation gain antenna pattern onto the terrain surface and a model of the atmosphere accounting for additional propagation delays. During the CP the TMSP has been adjusted to the in-orbit characteristics of the SAR data and instrument internal calibration. This includes adaptations of calibration pulse processing to a modified internal calibration strategy, accounting for duty cycle dependent pulse energy and temperature dependent gain levels as well as a fine tuning of the signal and geometry based Doppler centroid estimation algorithm. Furthermore, the determination of the reference function for range focusing has been optimized. Finally, the spectral weighting of the SAR data has been adjusted in order to obtain well balanced impulse response function properties in terms of resolution, side lobe ratios and azimuth ambiguities. The presentation reviews the essential features of the TMSP, summarizes the TMSP adjustments and presents results of the SAR product verification.

Document Type:Conference or Workshop Item (Speech)
Title:TerraSAR-X SAR Data Processing
Authors:
AuthorsInstitution or Email of Authors
Breit, HelkoUNSPECIFIED
Fritz, ThomasUNSPECIFIED
Balss, UlrichTechnische Universität München
Niedermeier, AndreasUNSPECIFIED
Lachaise, MarieUNSPECIFIED
Schättler, BirgitUNSPECIFIED
Date:November 2008
Keywords:SAR, TerraSAR-X, TMSP
Event Title:Committee on Earth Observation Satellites (CEOS)
Event Location:Oberpfaffenhofen, Germany
Event Type:international Conference
Event Dates:2008-11-27 - 2008-11-28
Organizer:DLR e.V.
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 Nutzlastbodensegment (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > SAR Signal Processing
Deposited By: Helko Breit
Deposited On:14 Jan 2009
Last Modified:12 Dec 2013 20:35

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