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Traffic Monitoring with SAR: Implications of Target Acceleration

Baumgartner, Stefan and Gabele, Martina and Krieger, Gerhard and Bethke, Karl-Heinz and Zuev, Sergey (2006) Traffic Monitoring with SAR: Implications of Target Acceleration. In: European Conference on Synthetic Aperture Radar (EUSAR), pp. 1-4. VDE Verlag GmbH. European Conference on Synthetic Aperture Radar (EUSAR), 2006-05-16 - 2005-05-18, Dresden, Germany. ISBN 3-8007-2960-1.

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In recent years many powerful techniques and algorithms have been developed to detect moving targets and estimate their motion parameters from single- or multi-channel SAR data. In case of single- and two-channel systems, most of the developed algorithms rely on analysis of the Doppler history. It is known that the Doppler shift relates mainly to ground moving target’s across-track velocity and the Doppler slope to moving target’s along-track velocity and across-track acceleration. In most of the existing algorithms the along-track velocity is calculated by using the estimated Doppler slope (e.g. estimated with a matched filter bank or time-frequency analysis) under the implicit assumption that the across-track acceleration is very small and therefore negligible. Since we want to monitor real and more complex traffic scenarios with a future space-based traffic monitoring system like TRAMRAD, we must know which target accelerations we have to handle in reality. For this reason a car was equipped with an inertial measurement system (IMU) and differential GPS to measure accelerations in all three dimensions during rush-hour traffic. In this paper the results of the acceleration measurements are presented and discussed. The measurement results show that a substantial part of the observed accelerations is significantly higher than 0.1 m/s<sup>2</sup>. A theoretical analysis (which is verified by detailed simulations) of the Doppler slope shows also that at such higher across-track accelerations a reliable estimation of the along-track velocity by means of a Doppler slope analysis is unemployable in practice. Finally, some basic ideas are presented which overcome this ambiguity problem and enable a reliable separation between along-track velocity and across-track acceleration.

Document Type:Conference or Workshop Item (Speech, Poster)
Title:Traffic Monitoring with SAR: Implications of Target Acceleration
AuthorsInstitution or Email of Authors
Baumgartner, StefanUNSPECIFIED
Gabele, MartinaUNSPECIFIED
Krieger, GerhardUNSPECIFIED
Bethke, Karl-HeinzUNSPECIFIED
Date:May 2006
Journal or Publication Title:European Conference on Synthetic Aperture Radar (EUSAR)
Refereed publication:No
In ISI Web of Science:No
Page Range:pp. 1-4
Publisher:VDE Verlag GmbH
Keywords:SAR, GMTI, Moving Targets, Acceleration
Event Title:European Conference on Synthetic Aperture Radar (EUSAR)
Event Location:Dresden, Germany
Event Type:international Conference
Event Dates:2006-05-16 - 2005-05-18
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:V SM - Sicherung der Mobilität (old)
DLR - Research area:Transport
DLR - Program:V SM - Sicherung der Mobilität
DLR - Research theme (Project):V - TRAMRAD (old)
Location: Berlin-Adlershof , Oberpfaffenhofen
Institutes and Institutions:Institute of Transport Research
Microwaves and Radar Institute > Microwave Systems
Microwaves and Radar Institute > Spaceborne SAR Systems
Deposited By: Stefan Baumgartner
Deposited On:26 Jun 2006
Last Modified:12 Dec 2013 20:09

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