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Performance Prediction and Verification for Bistatic SAR Synchronization Link

Younis, Marwan and Metzig, Robert and Krieger, Gerhard and Klein, Rainer (2006) Performance Prediction and Verification for Bistatic SAR Synchronization Link. In: Proceedings of European Conference on Synthetic Aperture Radar (EUSAR), p. 4. European Conference on Synthetic Aperture Radar (EUSAR), 2006-05-16 - 2006-05-18, Dresden, Germany.

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Bistatic SAR systems have a high potential for scientific, commercial and security applications. One of the benefits is the possibility to generate highly accurate digital elevation models using bistatic interferometry. Examples for proposed bi- and multi-static satellite missions with interferometric capabilities are TanDEM-X and Cartwheel. Both are based on radar instruments placed on different spacecrafts, which gives rise to several technical challenges for the system realization. A factor which may severely degrade the performance of a bistatic SAR is the phase instability of the two oscillators involved. Investigations have shown, that, unless highly stable oscillators are used, the oscillators phase noise has to be compensated; this is possible through the processed SAR data in combination with ground control points, or by establishing a synchronization link to directly exchange signals providing information on the oscillator phase noise. The later method is based on recording the received demodulated phases, which are then used to derive a compensation signal to correct the SAR data. The paper describes a possible configuration for the synchronization link, sharing hardware components with the SAR instrument. Such a system is currently intended for the TanDEM-X mission. The resulting restrictions on the synchronization scheme, timing, and accuracy are investigated. The statistical properties of the compensation signal are used to derive a figure-of-merit for synchronization performance. The focus is on the influence of the synchronization link RF hardware on the quality of the derived compensation signal. Therefore a hardware setup is realized and characterized to obtain realistic data. Further, a simulation tool is implemented to predict the performance. The simulation tool is based on a synchronization link hardware model which can use measurement data as an input. Finally, the complete synchronization process is verified by measurements using the test hardware.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:Performance Prediction and Verification for Bistatic SAR Synchronization Link
AuthorsInstitution or Email of Authors
Krieger, GerhardUNSPECIFIED
Klein, RainerEADS Astrium GmbH
Date:17 May 2006
Journal or Publication Title:Proceedings of European Conference on Synthetic Aperture Radar (EUSAR)
Refereed publication:No
In ISI Web of Science:No
Page Range:p. 4
Keywords:Bistatic synthetic aperture radar, compensation phase, oscillator noise, phase errors, phase noise, phase referencing, phase synchronization, synchronization link, synthetic aperture radar
Event Title:European Conference on Synthetic Aperture Radar (EUSAR)
Event Location:Dresden, Germany
Event Type:international Conference
Event Dates:2006-05-16 - 2006-05-18
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:Microwaves and Radar Institute
Microwaves and Radar Institute > Spaceborne SAR Systems
Deposited By: Dr.-Ing. Marwan Younis
Deposited On:23 May 2006
Last Modified:12 Dec 2013 20:19

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