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Krieger, Gerhard and De Zan, Francesco (2012) Relativistic Effects in Bistatic SAR Processing and System Synchronization. In: Proceedings of the European Conference on Synthetic Aperture Radar (EUSAR), pp. 1-4. VDE Verlag GmbH. European Conference on Synthetic Aperture Radar (EUSAR), 2012-04-23 - 2012-04-26, Nuremberg, Germany.
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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.
| Item URL in elib: | https://elib.dlr.de/76973/ | |||||||||
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| Document Type: | Conference or Workshop Item (Speech) | |||||||||
| Title: | Relativistic Effects in Bistatic SAR Processing and System Synchronization | |||||||||
| Authors: |
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| Date: | 23 April 2012 | |||||||||
| Journal or Publication Title: | Proceedings of the European Conference on Synthetic Aperture Radar (EUSAR) | |||||||||
| Refereed publication: | Yes | |||||||||
| Open Access: | Yes | |||||||||
| Gold Open Access: | No | |||||||||
| In SCOPUS: | No | |||||||||
| In ISI Web of Science: | No | |||||||||
| Page Range: | pp. 1-4 | |||||||||
| Publisher: | VDE Verlag GmbH | |||||||||
| Status: | Published | |||||||||
| Keywords: | TanDEM-X, relativity, interferometry, spacetime interval | |||||||||
| Event Title: | European Conference on Synthetic Aperture Radar (EUSAR) | |||||||||
| Event Location: | Nuremberg, Germany | |||||||||
| Event Type: | international Conference | |||||||||
| Event Dates: | 2012-04-23 - 2012-04-26 | |||||||||
| Organizer: | VDE | |||||||||
| 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 Technologie Experimente TSX und TDX (old) | |||||||||
| Location: | Oberpfaffenhofen | |||||||||
| Institutes and Institutions: | Microwaves and Radar Institute > Radar Concepts Microwaves and Radar Institute | |||||||||
| Deposited By: | Krieger, Dr.-Ing. Gerhard | |||||||||
| Deposited On: | 13 Aug 2012 10:43 | |||||||||
| Last Modified: | 31 Jul 2019 19:37 |
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