Acoustic and Electromagnetic Waves Propagating in a Tenuous Random Medium

1977 ◽  
pp. 61-67
Author(s):  
R. H. Clarke
Keyword(s):  
Electromagnetic Waves ◽  
Random Medium

Representation of the Coherent Field in Terms of the Coherent Green's Function Associated with Scattering of Waves in a Random Medium

1974 ◽  
Vol 52 (17) ◽  
pp. 1703-1713 ◽  
Author(s):  
S. N. Samaddar
Keyword(s):  
Electric Field ◽  
Green’S Function ◽  
Green's Function ◽  
Electromagnetic Waves ◽  
Random Medium ◽  
Fundamental Equation ◽  
Dielectric Medium ◽  
Dyadic Green’S Function ◽  
Dyadic Green's Function ◽  
Coherent Field

Development of the fundamental equation for the multiple scattering of electromagnetic waves by an ensemble of randomly distributed electrons is reviewed. From this expression integro-differential equations satisfied by the coherent electric field as well as the coherent dyadic Green's function are constructed. The scattered coherent field is then represented in terms of the coherent dyadic Green's function. In addition, analogous expressions are presented for the problem of scattering of electromagnetic waves from a fluctuating dielectric medium.

The Fading Characteristic of the GSM-R Network’s Field Intensity under Raining Condition

2011 ◽  
Vol 403-408 ◽  
pp. 2740-2745
Author(s):  
Ke Sun ◽  
Xin Yu Jin ◽  
Lu Rong Jiang ◽  
Xiang Bing Zeng
Keyword(s):  
Field Intensity ◽  
Theoretical Basis ◽  
Electromagnetic Waves ◽  
Random Medium ◽  
Mie Theory ◽  
Signal Strength ◽  
Measured Data ◽  
Severe Weather ◽  
Distribution Model ◽  
Scattered Power

The signal strength of the GSM-R network’s field intensity attenuates under raining condition due to the raindrop’s absorption and scattering. Moreover, the fading characteristic is influenced greatly by the scattering effect of the rainfall. Without regard to the landform and other factors, this paper uses Mie Theory to research the receiving level’s attenuation coefficient at different rainfall rates. And the related knowledge of electromagnetic waves through random medium is used to analyze the receiving level’s fading characteristic under raining condition. Analytical results indicate that the fading distribution model of the receiving level in GSM-R network is changed, except for the strength’s attenuation. Moreover, the fading depth grows under raining condition as a result of the scattered power caused by the raindrop. The analysis in this paper is proved by the measured data along the test section of Beijing-Tianjin line, and the research results provide the theoretical basis for GSM-R network’s anti-fading measures in the severe weather.

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