Exact ray path calculations using realistic ionospheres

Exact ray path calculations using realistic ionospheres

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The paper discusses a technique for fitting quasiparabolic layers to measured vertical electron density profiles. The method adopted is to represent individual ionospheres by the appropriate combination of E, E-F valley, F1 and F2 layers connected by joining layers. The method produces quite accurate representations of measured ionospheric profiles. The advantage of using quasiparabolic layers is that analytical solutions of various ray parameters can be obtained, including the effect on signal strength of ray tube divergence. Furthermore, tilted ionospheres can also be considered. The methods are illustrated by application to two vertical electron density profiles obtained from the same ionogram. The primary difference in the profiles is that one contains an E-F valley. Results are presented showing not only the effects of the profile differences, but also the effects of tilts, antenna patterns and ionospheric absorption.


    1. 1)
      • J.D. Milsom . Exact ray path calculations in a modified Bradley/Dudeney model ionosphere. IEE Proc. H, Microwaves, Antenna & Propag. , 1 , 33 - 38
    2. 2)
      • J.R. Dudeney , R.I. Kressman . Empirical models of the electron concentration of the ionosphere and their value for radio communications purposes. Radio Sci. , 319 - 330
    3. 3)
      • J.R. Dudeney . (1978) , An improved model of the variation of electron concentration with height in the ionosphere.
    4. 4)
      • H.G. Booker . Fitting of multi-region ionospheric profiles of electron density by a single analytic function of height. J. Atmos. Terr. Phys. , 619 - 623
    5. 5)
      • P.L. Dyson , J.A. Bennett . A model of the vertical distribution of the electron concentration in the ionosphere and its application to oblique propagation studies. J. Atmos. Terr. Phys. , 251 - 262
    6. 6)
      • D.C. Baker , S. Lambert . Multiparabolic ionospheric model for SSL applications. Ekectron. Lett. , 7 , 425 - 426
    7. 7)
      • D.C. Baker , S. Lambert . Range estimation for SSL HFDF systems by means of a multiquasiparabolic ionospheric model. IEE Proc. H, Microwaves, Antenna & Propag. , 120 - 125
    8. 8)
      • T.A. Croft , H. Hoogasian . Exact ray calculations in a quasi-parabolic ionosphere. Radio Sci. , 5 , 69 - 74
    9. 9)
      • J.E. Titheridge , J.V. Lincoln , R. Conkright . (1985) Ionogram analysis with the generalized program POLAN, World Data Center A Report UAG-82.
    10. 10)
      • J. Chen , P.L. Dyson , J.A. Bennett . Automatic fitting of quasi-parabolic segments to ionospheric profiles with application to single station location. J. Atmos. Terr. Phys. , 4 , 277 - 288
    11. 11)
      • K. Davies . (1965) , Ionospheric radio propagation.
    12. 12)
      • (1978) , Second CCIR computer-based interim method for estimating skywave field strength and transmission loss at frequencies between 2 and 30 MHz.
    13. 13)
      • K. Folkestad . Exact ray computations in a tilted ionosphere with no magnetic field. Radio Sci. , 1 , 81 - 84

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