Patent ID: 8711337
Filing Date: 2014-04-29
Classification: G01C,G01P,G01S

Abstract:
1. A method for determining a linear speed (Δv) of an object, comprising the steps of: a) sampling a series of light intensity courses I(t) over time t, each light intensity courses I(t) covering a different azimuthal direction, each different azimuthal direction defining a detection length (λ b) transforming the series of detection lengths (λ c) defining for each azimuthal direction a band pass or a high pass filter, relating for each detection length (λ d) filtering sampled light intensity for each azimuthal direction with the respective band pass or high pass filter to obtain a set of filtered light intensities; e) calculating the linear speed by dividing the characteristic filter frequencies through the linear spatial frequencies (SF f) determining the linear speed by correlating the calculated linear speeds for those azimuthal directions for which the filtered light intensity exceeds a predefined threshold.