Accession Number : ADP006296
Title : Upgrades for Efficient 3D Ionospheric Ray Tracing. Investigation of HF NVIS Effects,
Corporate Author : NAVAL RESEARCH LAB WASHINGTON DC
Personal Author(s) : Reilly, Michael H.
Report Date : 03 MAY 1990
Pagination or Media Count : 10
Abstract : An earlier, three-dimensional (3D) ray-tracing program has been upgraded to include magnetic field effects, variable step sizes, improved propagation loss computation, and efficient homing and focusing computation algorithms. A combination of fourth-order Runge-Kutta and Adams methods, with error control, has been included. The program is applied to an investigation of high-frequency (HF) near-vertical-incidence-skywave (NVIS) effects. Model simulations of oblique ionograms are found to be consistent with experiment. Implications for NVIS geolocation are discussed.
Descriptors : *IONOSPHERIC PROPAGATION, RAY TRACING, THREE DIMENSIONAL, TRANSMISSION LOSS, MAGNETIC FIELDS, RUNGE KUTTA METHOD, HIGH FREQUENCY.
Subject Categories : Radiofrequency Wave Propagation
Distribution Statement : APPROVED FOR PUBLIC RELEASE