Computations of the antenna cut-back factor for LF radio waves.

Hyovalti, D C

doi:10.6028/nbs.tn.330

Cited by 2 publications

(1 citation statement)

References 3 publications

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“…Consequendy, 1 o in the scale corresponds to 111 km. In previous calculations for homogeneous-earth models (Wait and Conda,l958;Hyovalti, 1965), the earth's radius ae was taken as (4/3)a to account for atmospheric refraction. The equivalent angular distance Oe used in the previous calculations is then d/ae.…”

Section: Discussionmentioning

confidence: 99%

Illumination of an inhomogeneous spherical earth by an LF plane electromagnetic wave

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1966 Antennas and Propagation Society International Symposium

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Starting with a previous formalism, a method is developed for computing the tangential magnetic field on the surface of an inhomogeneous spherical earth for excitation by a plane wave. The model consists of a two-section earth which is piecewise homogeneous. As has been shown before, the line integral approximation for the pattern function may be evaluated in terms of various representations for the pattern function and the groundwave attenuation functions for homogeneous earth. In the present paper, the results are cast in a form suitable for numerical work. This involves some nontrivial transformations of the relevant contour integral representations. Some specific examples for 50 and 100 kHz show that a marked recovery effect takes place as the receiving antenna is moved from land to sea.

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Section: Discussionmentioning

confidence: 99%

Illumination of an inhomogeneous spherical earth by an LF plane electromagnetic wave

Wait

1966 Antennas and Propagation Society International Symposium

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Methodology for Accounting the Influence of Parameters of a Spherical Underlying Surface with Finite Conductivity on VLF Antennas Characteristics

Tipikin

Potapov

2023

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The Earth's underlying surface has a significant impact on the characteristics of antennas and the energy parameters of the radio path. Although the theoretical aspects of the influence of the finite conductivity of the underlying surface on antennas have been sufficiently studied, there is a need for the development of a specific methodology that would allow to automize energy parameters calculations of radio paths using the wavehop method. This article presents a methodology for accounting for the electrical characteristics of the subsoil surface, which differs in its ability to use digital maps and automate calculations. It also includes separate calculation results for correcting antenna coefficients that confirm the theoretical calculations. The developed methodology can be used for calculations of energy parameters of radio paths using the wavehop method.

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Computations of the antenna cut-back factor for LF radio waves.

Cited by 2 publications

References 3 publications

Illumination of an inhomogeneous spherical earth by an LF plane electromagnetic wave

Illumination of an inhomogeneous spherical earth by an LF plane electromagnetic wave

Methodology for Accounting the Influence of Parameters of a Spherical Underlying Surface with Finite Conductivity on VLF Antennas Characteristics

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