Accession Number:

ADP006296

Title:

Upgrades for Efficient 3D Ionospheric Ray Tracing. Investigation of HF NVIS Effects,

Descriptive Note:

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON DC

Personal Author(s):

Report Date:

1990-05-03

Pagination or Media Count:

10.0

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.

Subject Categories:

  • Radiofrequency Wave Propagation
  • Atmospheric Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE