Numerical solution of the parabolic equation representing electromagnetic wave propagation in the troposphere using the box method

1994 ◽  
Author(s):  
Jian Fang ◽  
Weigan Lin ◽  
Yusheng Zhao
Keyword(s):  
Wave Propagation ◽  
Electromagnetic Wave ◽  
Parabolic Equation ◽  
Numerical Solution ◽  
Electromagnetic Wave Propagation ◽  
Box Method

scholarly journals Parabolic Equation Modeling of Electromagnetic Wave Propagation over Rough Sea Surfaces

Sensors ◽  
2019 ◽  
Vol 19 (5) ◽  
pp. 1252 ◽  
Author(s):  
Ying Gao ◽  
Qun Shao ◽  
Binzhou Yan ◽  
Qifan Li ◽  
Shuxia Guo
Keyword(s):  
Wave Propagation ◽  
Electromagnetic Wave ◽  
Parabolic Equation ◽  
Electromagnetic Wave Propagation ◽  
Sea Surface ◽  
Equation Modeling ◽  
Surface Model ◽  
Atmospheric Dust ◽  
Maritime Environment ◽  
Rough Sea

The parabolic equation is an efficient numerical solution for electromagnetic wave propagation. In order to address the difficulties in predicting electromagnetic wave propagation in the maritime environment caused by atmospheric dust and rough sea surfaces, and the shortcomings of the existing research that cannot fully reflect the rough characteristics of sea surfaces, the authors have modelled electromagnetic wave propagation in the maritime environment, including in the presence of atmospheric dust. In this study the authors present a parabolic equation modeling method for calculating the electromagnetic wave propagation over rough sea surfaces. Firstly, the rough sea surface is generated by building a double summation model of three-dimensional random sea surface. Then, combined with the piecewise linear shift transformation method of the parabolic equation model, the parabolic equation random sea surface model is constructed, and the electromagnetic wave propagation characteristics in a rough sea environment are analyzed. Finally, a large number of results are compared with the Miler-Brown model and shadow effect model in rough sea environments, which verifies that the random sea surface model can better characterize the influence of rough sea surfaces on electromagnetic wave propagation. The model can be used to improve the reliability of marine microwave communication links and the detection performance of ship-borne radar.

Electromagnetic-wave propagation over a rotating dielectric cylinder

1986 ◽  
Vol 64 (11) ◽  
pp. 1517-1521 ◽  
Author(s):  
T. C. K. Rao
Keyword(s):  
Wave Propagation ◽  
Electromagnetic Wave ◽  
Numerical Solution ◽  
Electromagnetic Wave Propagation ◽  
Propagation Constant ◽  
Dominant Mode ◽  
Dielectric Cylinder ◽  
Boundary Value Method ◽  
Radial Propagation ◽  
Rotational Process

The problem of guided electromagnetic-wave propagation over a rotating dielectric cylinder is solved by a boundary-value method assuming that the speed of rotation is much smaller than the velocity of light. From a numerical solution of the complex characteristic equation, the variation of the attenuation and the phase constants and their dependence on the speed of rotation are studied. The rotational process appears to divide the radial propagation constant inside a stationary cylinder into two waves with different propagation constants. The modes with positive and negative indices in the circumferential direction cease to be degenerate in the case of a rotating dielectric cylinder, and there appears to be a decrease in the attenuation with an increased speed of rotation for the dominant mode.

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