Spatial and frequency coherence of oblique, one-hop, high-frequency paths

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Description

We consider the effect of random index of refraction fluctuations upon long-distance, ionospherically-reflected, hf paths. Along with deterministic effects such as multipath and dispersion, such fluctuations have a deleterious impact on hf communication including nonabsorptive fading, time-of-arrival spread, angle-of-arrival spread, and Doppler spread. We develop a formalism to calculate the mutual coherence functions for spatial and frequency separations based upon a path integral solution of the parabolic wave equation for a single refracted path through an ionosphere which contains random electron density fluctuations. The statistics of the hf path depend directly on the strength and statistics of the electron density ... continued below

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34 p.

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Fitzgerald, T.J. October 1, 1995.

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Description

We consider the effect of random index of refraction fluctuations upon long-distance, ionospherically-reflected, hf paths. Along with deterministic effects such as multipath and dispersion, such fluctuations have a deleterious impact on hf communication including nonabsorptive fading, time-of-arrival spread, angle-of-arrival spread, and Doppler spread. We develop a formalism to calculate the mutual coherence functions for spatial and frequency separations based upon a path integral solution of the parabolic wave equation for a single refracted path through an ionosphere which contains random electron density fluctuations. The statistics of the hf path depend directly on the strength and statistics of the electron density fluctuations; we model the spatial power spectrum of the density fluctuation as a power law behavior versus frequency and with outer and inner scales.

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34 p.

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OSTI as DE96001439

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  • Other Information: PBD: Oct 1995

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  • Other: DE96001439
  • Report No.: LA--13023-MS
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/114649 | External Link
  • Office of Scientific & Technical Information Report Number: 114649
  • Archival Resource Key: ark:/67531/metadc628439

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  • October 1, 1995

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

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  • Feb. 26, 2016, 6:09 p.m.

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Fitzgerald, T.J. Spatial and frequency coherence of oblique, one-hop, high-frequency paths, report, October 1, 1995; New Mexico. (digital.library.unt.edu/ark:/67531/metadc628439/: accessed October 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.