Accession Number : ADD016147

Title :   Radio Wave Refractivity Deduced from Lidar Measurements.

Descriptive Note : Patent, Filed 31 Dec 90, patented 14 Dec 93,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Paulson, Merle R ; Hughes, Herbert G

Report Date : 14 Dec 1993

Pagination or Media Count : 20

Abstract : A high resolution lidar is used to backscatter light from atmospheric aerosols. The actual relative humidity is measured at altitudes corresponding to those from which the backscattered light occurs. A mathematical relationship between the two is then derived and this is used to predict atmospheric relative humidity from subsequent lidar backscatter's measurements. The predicted relative humidity is used with temperature and pressures derived from standard lapse rates to calculate the radio refractivity of the atmosphere. Radio ray coverage is then determined based upon the calculated radio refractivity.

Descriptors :   *AEROSOLS, *OPTICAL RADAR, *RADIO WAVES, *PATENTS, ALTITUDE, ATMOSPHERES, HIGH RESOLUTION, HUMIDITY, LAPSE RATE, LIGHT, MEASUREMENT, PRESSURE, REFRACTION, LIGHT SCATTERING, TEMPERATURE, BACKSCATTERING, ATMOSPHERIC REFRACTION, REFRACTIVE INDEX, ELECTROMAGNETIC WAVE PROPAGATION

Subject Categories : Optical Detection and Detectors
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE