Accession Number : ADA296913

Title :   TIREM/SEM Handbook.

Corporate Author : ELECTROMAGNETIC COMPATIBILITY ANALYSIS CENTER ANNAPOLIS MD

Personal Author(s) : Eppink, David ; Kuebler, Wolf

PDF Url : ADA296913

Report Date : MAR 1994

Pagination or Media Count : 131

Abstract : This document provides a description of the operation of the Terrain Integrated Rough Earth Model (TIREM) and the Spherical Earth Model (SEM), including the engineering formulations on which the models are based. Both models are modular programs with many common subroutines that conform with ANSI Fortran standards. TIREM and SEM can be used as independent propagation models for rough earth (with a known terrain profile) or smooth earth applications, respectively. Both models consider the effects of free space spreading, reflection, surface wave propagation, diffraction, tropospheric scatter propagation, and atmospheric absorption, as appropriate.

Descriptors :   *EARTH MODELS, *RADIO TRANSMISSION, LINE OF SIGHT, SURFACE WAVES, SURFACE ROUGHNESS, ELECTROMAGNETIC WAVE PROPAGATION, ATMOSPHERIC SCATTERING, TERRAIN, FORTRAN, STANDARDS, SUBROUTINES, HANDBOOKS, ATMOSPHERIC ATTENUATION, TROPOSPHERIC SCATTER COMMUNICATIONS.

Subject Categories : Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE