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Relativistic Effects in Bistatic SAR Processing and System Synchronization

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.

Document Type:Conference or Workshop Item (Speech)
Title:Relativistic Effects in Bistatic SAR Processing and System Synchronization
Authors:
AuthorsInstitution or Email of Authors
Krieger, GerhardUNSPECIFIED
De Zan, FrancescoUNSPECIFIED
Date:23 April 2012
Journal or Publication Title:Proceedings of the European Conference on Synthetic Aperture Radar (EUSAR)
Refereed publication:Yes
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: Dr.-Ing. Gerhard Krieger
Deposited On:13 Aug 2012 10:43
Last Modified:08 May 2014 23:23

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