Accession Number : AD0451653

Title :   RADIO REFRACTION BY THE MARINE LAYER AND ITS EFFECT ON MICROWAVE PROPAGATION,

Corporate Author : NAVY ELECTRONICS LAB SAN DIEGO CA

Personal Author(s) : Gossard, Earl E.

Report Date : 21 SEP 1964

Pagination or Media Count : 11

Abstract : This paper discusses the microwave propagation phenomena that exist at the air-sea interface due to the large gradients of temperature and humidity near the sea surface. The parameters used to describe radio refractive index are first discussed and ththeir dependence on temperature and humidity is described. Some refractive index models within the atmospheric boundary layer are discussed and the effects of surface roughness and atmospheric thermal stability on the models is described. The radio propagation problem is then solved for one kind of model and a trapping criterion is developed. The theoretical predictions areera snons are then compared with experimental data obtained over Cardigan Bay in England and over the Baltic Sea by West German workers. It is concluded that meteorological and oceanographic conditions near the air-sea interface can have an important influence on the signal strength and fading characteristics observed on any neargrazing path if one or both terminals are near the surface of the sea. (Author)

Descriptors :   (*RADIO WAVES, REFRACTION), (*MICROWAVES, PROPAGATION), REFRACTIVE INDEX, ATMOSPHERES, TEMPERATURE, HUMIDITY, BOUNDARY LAYER, REER, RADIO SIGNALS, ATTENUATION, OCEANS, SURFACE PROPERTIES, MATHEMATICAL MODELS.

Distribution Statement : APPROVED FOR PUBLIC RELEASE