A refine micro-Doppler analysis of pedestrians in ISAR imaging

Conference: EUSAR 2008 - 7th European Conference on Synthetic Aperture Radar
06/02/2008 - 06/05/2008 at Friedrichshafen, Germany

Proceedings: EUSAR 2008

Pages: 4Language: englishTyp: PDF

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Ghaleb, A.; Vignaud, L. (ONERA (The French Aerospace Lab), Electromagnetism and Radar Department, Chemin de la Hunière, 91761 Palaiseau Cedex - France)
Nicolas, J. M.; Ghaleb, A. (GET-Telecom Paris, 46, rue Barrault – 75634 Paris Cedex 13 - France)

In radar imaging it's well known that relative motion or deformation of parts of illuminated objects induce additional features in the Doppler frequency spectra. These features are called micro-Doppler effect and appear as sidebands around the central Doppler frequency. They can provide valuable information about the structure of the moving parts and may be used for identification purposes. Previous papers have mostly focused on 1D micro-Doppler analysis. In this paper, we propose to emphasize the analysis of such "non stationary targets" using a 2D imaging space, using both the micro-Doppler and a high range resolution analysis. As in 2D-ISAR imaging, range separation enables us to better discriminate the various effects caused by the time varying reflectors. We will focus our study on the human motion. Thanks to the micro-doppler signature we are able to extract information on the gait of pedestrians. We will show examples on simulated and experimental data.