Patent ID: 7391506
Filing Date: 2008-06-24
Classification: G01S,Y02A

Abstract:
1. A coherent laser radar device for atmospheric wind speed measurement comprising: a transmitter arranged to focus a beam of light to a plurality of remote probe volumes, said plurality of remote probe volumes comprising at least one measurement remote probe volume and at least one reference remote probe volume, a receiver arranged to detect back-scattered light, and an analyser arranged to calculate wind speed at the remote probe volume from the Doppler shift in frequency of the detected back-scattered light, wherein the analyser is arranged to use Doppler frequency characteristics of the back-scattered light detected when the transmitter is focused to said at least one reference remote probe volume during the calculation of wind speed at each of said at least one measurement remote probe volume to correct for any Doppler frequency components of the detected back-scattered light that arise from back-scatter off cloud located at a range greater than the range of the remote probe volume.