Relativistic Effects in Bistatic SAR Processing and System Synchronization
Krieger G, De Zan F (2012)
Publication Type: Conference contribution
Publication year: 2012
Publisher: VDE Verlag GmbH
Edited Volumes: Proceedings of the European Conference on Synthetic Aperture Radar, EUSAR
Book Volume: 2012-April
Pages Range: 1-4
Conference Proceedings Title: European Conference on Synthetic Aperture Radar (EUSAR)
ISBN: 9783800734047
URI: https://elib.dlr.de/76973/
Abstract
This paper addresses relativistic effects in bistatic and multistatic SAR systems and missions. It is shown that the use of different reference frames for bistatic SAR processing and bistatic radar synchronization is prone to nota-ble phase and time errors. These errors are a direct consequence of the relativity of simultaneity and can be ex-plained in good approximation within the framework of Einstein′s special theory of relativity. Using the invari-ance of the spacetime interval, an analytic expression is derived which shows that the time and phase errors in-crease with increasing along-track distance between the satellites. The predicted errors are in excellent agreement with measurements from TanDEM-X and provide a satisfactory explanation for previously observed DEM height offsets that exceeded +-10 m. Consideration of the unexpected relativistic effects is essential for accurate DEM generation in TanDEM-X and has in the meantime been implemented in the operational processing chain.
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Germany (DE)How to cite
APA:
Krieger, G., & De Zan, F. (2012). Relativistic Effects in Bistatic SAR Processing and System Synchronization. In European Conference on Synthetic Aperture Radar (EUSAR) (pp. 1-4). VDE Verlag GmbH.
MLA:
Krieger, Gerhard, and Francesco De Zan. "Relativistic Effects in Bistatic SAR Processing and System Synchronization." Proceedings of the 9th European Conference on Synthetic Aperture Radar, EUSAR 2012 VDE Verlag GmbH, 2012. 1-4.
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