Specification for a Standard Electromagnetic Propagation Model

Abstract

Abstract : A standard electromagnetic (EM) propagation model has been developed at the Naval Ocean Systems Center. It provides the user with a method of assessing EM propagation from 100 MHz to 20 GHz in the marine environment for a variety of atmospheric conditions. The software implementation of the model returns the pattern propagation factor in describes when a user supplies the model with the proper environment and EM system inputs. The pattern propagation factor is defined as the ratio of the actual electric field at some point to the field that would exist at that point under free-space propagation conditions. Free-space propagation is the propagation of energy that would occur if an omnidirectional point-radiating source were placed in outer space. The model is described in detail and ANSI Fortran program using the model is provided. The program that implements the model can be either incorporated into an application model that requires EM propagation information or used as a stand-alone program. Keywords: Electromagnetic wave, Mathematical model, Free-space.