Accession Number : ADD016410

Title :   High Speed Method for Predicting Radio-Wave Propagation.

Descriptive Note : Patent, Filed 12 Feb 92, patented 5 Apr 94,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Hitney, Herbert V

Report Date : 05 Apr 1994

Pagination or Media Count : 11

Abstract : Radio-wave propagation is rapidly predicted by a hybrid computational method that uses Ray Optics techniques to calculate radio field strength above a limiting radio-wave ray, Parabolic Equation techniques to calculate radio field strength below the limiting radio-wave ray and below a predetermined altitude, and a newly created Extended Optics method to compute radio field strength in an area of the atmosphere below the limiting radio-wave ray and above the predetermined altitude. Rays in the extended optics area are initialized from the elevation angle that rays traced through the parabolic equation area make with the predetermined altitude. Where reflected, direct or origin created rays do not exist within the parabolic equation area, the elevation angle for the ray that does exist at the furthest range (optical limit) is used to initiate ray tracing in the extended optics area for ranges beyond the optical limit.

Descriptors :   *RADIO WAVES, *RAY TRACING, *WAVE PROPAGATION, *OPTICAL ANALYSIS, ALTITUDE, ATMOSPHERES, RADIO EQUIPMENT, RADIO FIELDS, COMPUTER AIDED INSTRUCTION, COMPUTATIONS, REFRACTIVE INDEX, ANTENNA RADIATION PATTERNS, MATHEMATICAL PREDICTION

Subject Categories : Radiofrequency Wave Propagation
      Optics
      Computer Programming and Software

Distribution Statement : APPROVED FOR PUBLIC RELEASE