Exact ray path calculations in a modified Bradley/Dudeney model ionosphere

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Exact ray path calculations in a modified Bradley/Dudeney model ionosphere

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Bradley and Dudeney's model of the vertical distribution of the ionospheric electron concentration consists of three distinct sections. Both the E-region and F2-region are described by parabolic variations. A linear increase is assumed to exist between the E-region peak and the F2-region. This model is currently recommended by the International Radio Consultative Committee (CCIR) for use in long-term HF sky-wave prediction work. If a slightly modified electron-concentration profile is adopted, it is possible to derive exact expressions which describe some important characteristics of oblique ray paths in the model ionosphere. Ground range, group path, phase path and apogee height can all be computed using this technique. Collisions and the effect of the earth's magnetic field are ignored. These expressions have been used for several applications where a knowledge of multipath structure on ionospheric paths is necessary.

Inspec keywords: radiowave propagation; ionospheric electromagnetic wave propagation; E-region; F-region

Other keywords: E-region; apogee height; Earth's magnetic field; multipath structure; vertical distribution; ionospheric electron concentration; parabolic variations; exact ray path calculations; F-region; ground range; long-term HF sky-wave prediction; group path; phase path; oblique ray paths; modified Bradley/Dudeney model ionosphere; F2-region

Subjects: Radiowave propagation; F-region; Ionospheric electromagnetic wave propagation; E-region

References

    1. 1)
      • : `Second CCIR computer-based interim method for estimating sky-wave field strength and transmission loss at frequencies between 2 and 30 MHz', 252-2, Supplement to CCIR Report, 1978, CCIR.
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      • T.A. Croft , H. Hoogasian . Exact ray calculations in a quasi-parabolic ionosphere. Radio Sci. , 69 - 74
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      • J.R. Dudeney . An improved model of the variation of electron concentration with height in the ionosphere. J. Atmos. & Terr. Phys. , 195 - 203
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      • D.E. Westover . Exact ray path solutions in a quasi-linear ionosphere. Radio Sci. , 75 - 79
    5. 5)
      • P.A. Bradley , J.R. Dudeney . A simple model of the vertical distribution of electron concentration in the ionosphere. J. Atmos. & Terr. Phys. , 2131 - 2141
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      • J.D. Milsom . Exact ray-tracing through the Bradley-Dudeney model ionosphere. Marconi Rev. , 172 - 196
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      • D.B. Muldrew . An ionospheric ray-tracing technique and its application to a problem in long distance radio propagation. IRE Trans. , 393 - 396
    8. 8)
      • M. Lockwood . Simple M-factor algorithm for improved estimation of the basic maximum usable frequency of radio waves reflected from the ionospheric F-region. IEE Proc. F, Commun. Radar & Signal Process. , 4 , 296 - 302
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