'MODESRCH', An Improved Computer Program for Obtaining ELF/VLF/LF Mode Constants in an Earth-Ionosphere Waveguide

Abstract

MODESRCH is a FORTRAN computer program designed to obtain rapidly, economically, and accurately, the mode constants needed to describe propagation in the earth-ionosphere waveguide at ELF, VLF and LF (10 Hz to 60 kHz). It is suggested that MODESRCH, along with required mode summing procedures, be used to replace 'waveguide' and 'wave-hop' codes currently used in network analysis programs which cover the ELF to LF frequency bands. This report contains a discussion of the analytical approach taken in MODESRCH, a FORTRAN listing of the program, instructions for using the program and some sample calculations.

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Document Details

Document Type
Technical Report
Publication Date
Oct 01, 1976
Accession Number
ADA032573

Entities

People

  • Charles H. Shellman
  • David G. Morfitt

Organizations

  • Navy Electronics Laboratory

Tags

Communities of Interest

  • Advanced Electronics
  • Air Platforms
  • Energy and Power Technologies
  • Weapons Technologies

DTIC Thesaurus Topics

  • Altitude
  • Computer Programs
  • Differential Equations
  • Electric Fields
  • Electromagnetic Fields
  • Electron Density
  • Frequency Bands
  • Geometry
  • Lepidoptera
  • Physics Laboratories
  • Plastic Explosives
  • Quadratic Equations
  • Radio Fields
  • Radio Waves
  • Real Variables
  • Refraction
  • Refractive Index

Fields of Study

  • Physics

Readers

  • Computer Science.
  • International Relations, focusing on Korea-Africa and North Korea-South Korea relations, and Nigeria-Latin American Relations.
  • Space/Atmospheric Physics.