Method and lidar system for measuring air turbulences on board aircraft and for airports and wind farms

The invention relates to a method for measuring air turbulences with a lidar system, particularly on board aircraft during which a pulsed expanded laser beam of a predetermined wavelength is emitted up to a spatial area and light backscattered from this spatial area is received. At a first point in time t and at a second point in time t after emitting a laser pulse (L), the intensity distribution in the cross-section of the backscattered light is measured, and an air turbulence in a measuring field defined by points in time t and t is determined from the comparison of both intensity distributions. Images of speckle patterns are recorded with the aid of cameras. An evaluation unit conducts a cross correlation in order to render the turbulence visible and to display it on a monitor.