From inside the book
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Page 36
... elevations in the reflect- ing plane of average height H. One such " hump " is shown in the figure together with two rays one of which is assumed to be reflected from the ground sur- face and one from the top of the " hump . " The dif ...
... elevations in the reflect- ing plane of average height H. One such " hump " is shown in the figure together with two rays one of which is assumed to be reflected from the ground sur- face and one from the top of the " hump . " The dif ...
Page 38
... elevations reached only by the direct rays since the ground re- flection is negligible . At lower angular elevations • with n = 1 , 3 , 5 for the maxima , n = 0 , 2 , 4 · · • for the minima . = If h2hi , the angle of elevation is h2 / d ...
... elevations reached only by the direct rays since the ground re- flection is negligible . At lower angular elevations • with n = 1 , 3 , 5 for the maxima , n = 0 , 2 , 4 · · • for the minima . = If h2hi , the angle of elevation is h2 / d ...
Page 39
... elevation . Thus a set of implicit equations has to be solved for each angle of elevation giving h ' , and h′2 as functions of h1 , h2 , and d , whereupon the inter- ference between the direct and reflected rays is computed as in the ...
... elevation . Thus a set of implicit equations has to be solved for each angle of elevation giving h ' , and h′2 as functions of h1 , h2 , and d , whereupon the inter- ference between the direct and reflected rays is computed as in the ...
Page 43
... elevations in cold climates and at higher elevations in warm climates . The meteorological conditions which yield these curves will be dealt with extensively in Chapter 9 , and few indications may suffice here . Ordinarily , on going ...
... elevations in cold climates and at higher elevations in warm climates . The meteorological conditions which yield these curves will be dealt with extensively in Chapter 9 , and few indications may suffice here . Ordinarily , on going ...
Page 45
... of constant height can be represented by parabolas in the approximation where the true vertical elevations are small compared to the hori- zontal distances involved . ALTITUDE IN FEET 7000 6000 1 5000 4000 3000 2000 RAY TRACING 45.
... of constant height can be represented by parabolas in the approximation where the true vertical elevations are small compared to the hori- zontal distances involved . ALTITUDE IN FEET 7000 6000 1 5000 4000 3000 2000 RAY TRACING 45.
Common terms and phrases
altitude angle antenna attenuation azimuth band Chapter Committee on Propagation computed coverage diagram CUDWR curvature curve decibels decrease diffraction diffraction region distance Division 14 Report earth earth radius effects electromagnetic equation equipment errors experiments factor FEET field intensity field strength forecasting free space frequency functions gradient ground h₁ h₂ height horizontal humidity index of refraction JEIA land layer line of sight lobe maximum measurements meter method microwave miles modes moisture NDRC nomogram nonstandard propagation NRSL obtained operational optical OSRD permanent echoes plane polarization problem radar cross section Radio Propagation Radio Waves radius range receiver reflection coefficient refractive index region Research signal strength Snell's law standard atmosphere standard propagation superrefraction surface target temperature inversion theory tion transmitter Tropospheric United variations vertical water vapor Wave Propagation Wave Propagation Group wavelength weather X band zone