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Relativistic Effects in Bistatic Synthetic Aperture Radar

Krieger, Gerhard and De Zan, Francesco (2014) Relativistic Effects in Bistatic Synthetic Aperture Radar. IEEE Transactions on Geoscience and Remote Sensing, 52 (2), pp. 1480-1488. IEEE - Institute of Electrical and Electronics Engineers. DOI: 10.1109/TGRS.2013.2251640 ISSN 0196-2892

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Official URL: http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6515190&refinements%3D4280351953%26sortType%3Dasc_p_Sequence%26filter%3DAND%28p_IS_Number%3A4358825%29

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 notable phase and time errors. These errors are a direct con-sequence of the relativity of simultaneity and can be explained in good approximation within the framework of Einstein’s special theory of relativity. Using the invariance of the spacetime interval, an analytic expression is derived which shows that the time and phase errors increase with increasing along-track distance between the satellites. The predicted errors are in excel-lent agreement with measurements from TanDEM-X and provide a satisfactory explanation for previously observed DEM height offsets that exceeded +- 10 m. Consideration of the unex-pected 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/82374/
Document Type:Article
Title:Relativistic Effects in Bistatic Synthetic Aperture Radar
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Krieger, GerhardUNSPECIFIEDUNSPECIFIED
De Zan, FrancescoUNSPECIFIEDUNSPECIFIED
Date:February 2014
Journal or Publication Title:IEEE Transactions on Geoscience and Remote Sensing
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:52
DOI :10.1109/TGRS.2013.2251640
Page Range:pp. 1480-1488
Publisher:IEEE - Institute of Electrical and Electronics Engineers
ISSN:0196-2892
Status:Published
Keywords:Relativity, Simultaneity, TanDEM-X, Bistatic, Multistatic, Synchronization, Interferometry, Radargrammetry, Synthetic Aperture Radar (SAR)
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Technologie Experimente TSX und TDX, R - Projekt TanDEM-X, R - Vorhaben Tandem-L Vorstudien, R - Vorhaben Entwicklung eines Mini-SAR
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute > Radar Concepts
Microwaves and Radar Institute
Deposited By: Krieger, Dr.-Ing. Gerhard
Deposited On:16 May 2013 09:46
Last Modified:31 Jul 2019 19:40

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