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Emission laser impulsionnelle et traitements temps-fréquence en vibrométrie par lidar à détection cohérente

Abstract : The use of pulsed lasers could lead to new functionnalities and increased compacity of lidar systems for remote vibration sensing. However, specific amplitude and phase noises affect the lidar signal, and particularly decrease the performance of a polypulse based emission regime, thought to be promising for very long range measurements. This work first deals with the experimental characterization of these noise sources in order to properly model them, with a focus on atmospheric turbulence. We then seek to optimize the employed waveform and signal processing in regard of the vibration and noise conditions. An original method is proposed that involves maximum likelihood based estimation of the vibration-induced Doppler shift, and its extraction from a time-frequency representation of the signal. The benefits of this approach are shown in simulation and experimentation, by comparing the performance of various emission modes.
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https://tel.archives-ouvertes.fr/tel-00610531
Contributor : Julien Totems <>
Submitted on : Friday, July 22, 2011 - 1:20:44 PM
Last modification on : Thursday, November 19, 2020 - 12:59:38 PM
Long-term archiving on: : Friday, November 4, 2011 - 3:10:38 PM

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  • HAL Id : tel-00610531, version 1

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Julien Totems. Emission laser impulsionnelle et traitements temps-fréquence en vibrométrie par lidar à détection cohérente. Traitement du signal et de l'image [eess.SP]. Institut National Polytechnique de Grenoble - INPG, 2011. Français. ⟨tel-00610531⟩

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