The Propagation of Radio Waves Through the Standard AtmosphereOffice of Scientific Research and Development, National Defense Research Committee, Committee on Propagation, 1946 - Electric waves - 206 pages |
Common terms and phrases
antenna height approximately array assumed calculation Chapter CHART CONSTANT GRADIENT contour corresponding coverage diagram curvature curve d₁ decibels dielectric constant dielectric earth diffraction region distance divergence factor dmax doublet doublet antenna effect equal field strength Figure 15 formula free space free-space field frequency Fresnel zones G₁ gain factor given in Figure gives GRADIENT OF REFRACTIVE grazing angle ground ground constants h₁ h₂ half-wave dipole height h₁ horizontal polarization length line of sight lobe maxima maximum range meters method NDRC noise noise figure P₁ P₂ parameter path difference permanent echoes plane earth plotted radar cross section radar gain radiation field radiation pattern radio gain radius ratio reactance receiver height receiving antenna reflected rays reflection coefficient reflection point reflector REFRACTIVE INDEX scattering sea water sin² surface Table TANGENT RAY target tion transmitter height versus vertical polarization wavelength ηλ