XWVG: A Waveguide Program for Trilinear Tropospheric Ducts. Computer Program for Calculating the Signal Levels of EM (Electromagnetic) Waves Propagating over Seawater.
Technical document Oct 82-Jun 83,
NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA
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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
- Computer Programming and Software
- Radiofrequency Wave Propagation
- Non-Radio Communications