Accession Number : AD0824281

Title :   RAY TRACING INVESTIGATION OF DIRECTION OF ARRIVAL OF HF RADIO WAVES OBSERVED IN A RADIOLOCATION EXPERIMENT.

Descriptive Note : Technical rept.,

Corporate Author : ILLINOIS UNIV AT URBANA RADIO RESEARCH LAB

Personal Author(s) : Rao, N. Narayana

Report Date : DEC 1967

Pagination or Media Count : 20

Abstract : A high frequency radiolocation experiment involving a transmitter near Houston, Texas and a receiver near Urbana, Illinois has been under progress on a continuous basis for one week per month since March 1967. A network of five vertical incidence ionosondes located near and around the midpoint of the great circle path permit the evaluation of electron density gradients along the propagation path from true height analysis of ionograms recorded by this network. These gradients are used in conjunction with a three dimensional ray tracing computer program to compute the expected directions of arrival of the radio waves. Changes in bearing resulted from temporal variations in the electron density distribution and seasonal variations in the sunrise tilts are investigated. The results obtained by ray tracing are found to be in excellent agreement with the measured bearing deviations. Effective layer tilts are computed from the results of ray tracing. (Author).

Descriptors :   *ELECTRON DENSITY), (*IONOSPHERIC PROPAGATION, (*RADIO WAVES, HIGH FREQUENCY), DIRECTION FINDING STATIONS, ANGLE OF ARRIVAL, COMPUTERS, RADIO TRANSMITTERS, RADIO RECEIVERS.

Subject Categories : Radiofrequency Wave Propagation
      Radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE