Patent ID: 7858920
Filing Date: 2010-12-28
Classification: F41G,G01S

Abstract:
1. A method for detecting an object located in a scene, comprising; illuminating said object by a laser signal having a first wavelength; forming at least one first image of said scene in which said illuminated object is located, through a first filter, a bandwidth of said first filter tuned to said first wavelength; forming at least one second image of said scene, in which said illuminated object is located, through a second filter, a bandwidth of said second filter being tuned to a second wavelength different from said first wavelength, such that each first image has a corresponding second image; and forming third images each of which is a difference between one of the first images and the corresponding second image, wherein: said laser signal illuminating said object comprises a series of laser pulses; the first image and the corresponding second image are formed in strict synchronism with each laser pulse of said series; and said second wavelength is sufficiently close to said first wavelength for a backscattering of solar light by said scene to be at least approximately similar in the first image and in the corresponding second image.