4 May 2009 Standoff detection of obscured vehicle with laser Doppler vibrometer
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Detection and identification of vehicles obscured by forest canopy is a particularly challenging military problem. Imaging techniques, e.g. laser radar imaging a target through gaps in foliage, require extensive data, making this approach processing-intensive and time-consuming. A new method for standoff detection of a vehicle obscured under forest canopy by remotely sensing the vibration of foliage with a laser Doppler vibrometer (LDV) has been proposed. The method uses the effect of the vehicle engine creating sound waves, which then travel through the air and then couple into tree leaves, causing them to vibrate. The presence of a vehicle can be determined by the spectrum of the leaves' vibrations. Experimental study has shown that vibration velocity of leaves excited by sound from a vehicle is high enough to be reliably detected with a LDV. The vibrations of leaves excited with simulated vehicle acoustic stimuli and a real vehicle were successfully measured with a LDV in the laboratory and in an outdoor environment. The effect of wind on measurements have been studied and discussed in the current work.
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Vyacheslav Aranchuk, James Sabatier, Alex Ekimov, and Richard Mack "Standoff detection of obscured vehicle with laser Doppler vibrometer", Proc. SPIE 7303, Detection and Sensing of Mines, Explosive Objects, and Obscured Targets XIV, 73030H (4 May 2009); doi: 10.1117/12.818400; https://doi.org/10.1117/12.818400

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