Accession Number : ADA133667

Title :   XWVG: A Waveguide Program for Trilinear Tropospheric Ducts. Computer Program for Calculating the Signal Levels of EM (Electromagnetic) Waves Propagating over Seawater.

Descriptive Note : Technical document Oct 82-Jun 83,

Corporate Author : NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA

Personal Author(s) : Baumgartner,G B , Jr

PDF Url : ADA133667

Report Date : 30 Jun 1983

Pagination or Media Count : 210

Abstract : XWVG is a reliable waveguide program for calculating the coherent and incoherent mode sum values of the electromagnetic field strength in dB relative to the free space value, for signals propagating in a trilinear tropospheric duct over seawater. XWVG allows for the effects of surface roughness, absorption by atmospheric gases, and the variation of the complex index of refraction of seawater as a function of temperature, salinity, and frequency. XWVG has been successfully used in the frequency range 50 MHz to 94 GHz and should be usable at higher frequencies. XWVG uses the root-finding routine of Shellman and Morfitt to find the complex modes propagating in the duct. This guarantees that all modes with an attenuation rate below a prespecified level will be found. A description of XWVG is provided, along with a complete program listing and sample output. (Author)

Descriptors :   *Electromagnetic wave propagation, *Computer program documentation, Signal processing, Tropospheric scatter communications, Ducts, Sea water, Atmospheric refraction, Field intensity

Subject Categories : Computer Programming and Software
      Radiofrequency Wave Propagation
      Non-radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE