Radio wave scattering in tropospheric propagation
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The scattering theory of Booker and Gordo has been developed, assuming the correlation function C(r) = C(0)\exp(-r/l) , so as to be suitable for easy numerical calculation of the transmission loss expected with this mode of transmission; C(0) denotes the variance with time of the refractive index of the atmosphere, and l denotes the scale of turbulence. In this development the parameter, [C(0)/l] , emerges as a direct measure of the radio wave power transmitted by this mode of propagation. The theory is used to calculate the transmission loss to be expected on the transmission paths involved in the National Bureau of Standards Cheyenne Mountain experiment which cover the transmitting antenna height range from 30 to 7800 feet, distance range 223 to 628 miles, and frequency range 100-1046 Mc. The dependence of [C(0)/l] on height above the earth's surface which must be assumed in these predictions to obtain agreement with the experimental transmission loss data is in qualitative agreement with the meager meteorological data which are now available for estimating this parameter.
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