Accession Number : AD0832836

Title :   BEARING DEVIATION IN HF TRANSIONOSPHERIC PROPAGATION.

Descriptive Note : Technical rept.,

Corporate Author : ILLINOIS UNIV AT URBANA RADIO RESEARCH LAB

Personal Author(s) : Rao, N. Narayana

Report Date : MAY 1968

Pagination or Media Count : 60

Abstract : Expressions are derived for the exact computation of bearing deviation and other high frequency radio ray path parameters in a model ionosphere with no magnetic field but with electron density varying in three dimensions. The three dimensional variation is simulated by assuming a spherically symmetric ionospheric model but with its center of curvature displaced from the center of the earth and by launching the ray out of the plane containing the transmitter and the two centers of curvature. Some numerical results for the ray path parameters are presented for the quasi-parabolic and quasi-linear models. Two applications of the exact computations of the ray path parameters and in particular the bearing deviations are considered. These are (1) evaluation of the ITSA three dimensional ray tracing computer program and (2) investigation of direction of arrival observations of hf radio waves. In both cases, very good agreement has been found between the two sets of results. (Author)

Descriptors :   (*IONOSPHERIC PROPAGATION, RADIO BEAMS), (*RADIO BEAMS, DEFLECTION), (*RADIO TRANSMISSION, DIRECTION FINDING), HIGH FREQUENCY, ELECTRON DENSITY, REFRACTION, IONOSPHERE, ATMOSPHERE MODELS, MAGNETIC FIELDS, TRANSMITTER RECEIVERS, ERRORS, NUMERICAL ANALYSIS, COMPUTER PROGRAMS.

Subject Categories : Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE