Accession Number : ADA119581

Title :   Atmospheric Effects on Ultra High Frequency Radio Propagation.

Descriptive Note : Master's thesis,


Personal Author(s) : Boudreaux,Joseph Clent , III

PDF Url : ADA119581

Report Date : Jun 1982

Pagination or Media Count : 88

Abstract : The dependence of received power on range within and below atmospheric ducts was measured in conditions of elevated, nonhomogeneous, multilayered ducts. An aircraft with UHF transmitter covered the range 0 to 150 nm. from a shore based receiver. Range dependent maxima and minima in received power were detected at the surface in elevated duct conditions. The results were compared to predictions from ray, waveguide multi-mode, and single mode theories. Ray and single mode theories were inadequate to predict power patterns over the horizon. Multi-mode theory yielded qualitative agreement for conditions of deep, low elevated ducts. Agreement for higher, thinner, ducts was poor. Multilayered duct systems were observed and produced interference patterns without recognizable period with range. (Author)

Descriptors :   *Ducts, *Layers, *Interference, *Atmospheric refraction, Shores, Aircraft, Transmitters, Atmospheres, Ultrahigh frequency, Receivers, Multimode, Shores, Power, Qualitative analysis, Patterns, Waveguides, Theory, Theses

Subject Categories : Atmospheric Physics
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE