Traffic Monitoring with SAR: Implications of Target Acceleration
Baumgartner S, Gabele M, Krieger G, Bethke KH, Zuev S (2006)
Publication Type: Conference contribution
Publication year: 2006
Publisher: VDE Verlag GmbH
Pages Range: 1-4
Conference Proceedings Title: European Conference on Synthetic Aperture Radar (EUSAR)
URI: https://elib.dlr.de/20870/
Abstract
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{\ensuremath{<}}sup{\ensuremath{>}}2{\ensuremath{<}}/sup{\ensuremath{>}}. 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.
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Germany (DE)How to cite
APA:
Baumgartner, S., Gabele, M., Krieger, G., Bethke, K.-H., & Zuev, S. (2006). Traffic Monitoring with SAR: Implications of Target Acceleration. In European Conference on Synthetic Aperture Radar (EUSAR) (pp. 1-4). VDE Verlag GmbH.
MLA:
Baumgartner, Stefan, et al. "Traffic Monitoring with SAR: Implications of Target Acceleration." Proceedings of the European Conference on Synthetic Aperture Radar (EUSAR) VDE Verlag GmbH, 2006. 1-4.
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