Slant range visibility determination from lidar signatures by the two-point method

Abstract Careful measurement of slant range visibility is becoming more important for safe and regular aircraft landing operation. Measurements are necessary under conditions of less than 1500 m visibility up to altitudes of about 100 m. Discussions of the use of laser radar systems to measure the optical properties of the atmosphere have been published. For practical applications such an expensive system was not useful. This paper describes a modified laser range-finder system which uses a simplified slope method. The accuracy of this two-point method is analyzed for several atmospheric conditions. Measurements with a described prototype system are presented.