Summary Technical Report of the Committee on Propagation, NDRC: The propagation of radio waves through the standard atmosphereThe Committee, 1946 - Meteorology |
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Page 8
... reflected and direct rays are comparable in strength , so that at certain points ( on lines ... reflection from the convex surface of the earth but also because the ... coefficient for plane waves impinging on a plane surface . The field ...
... reflected and direct rays are comparable in strength , so that at certain points ( on lines ... reflection from the convex surface of the earth but also because the ... coefficient for plane waves impinging on a plane surface . The field ...
Page 52
... REFLECTION 4.2.1 Ground Reflection and Coverage The reinforcement of the direct ray by the ground- reflected ray is of great importance both in radar and in communication work ... reflection coefficient. 52 FACTORS INFLUENCING TRANSMISSION.
... REFLECTION 4.2.1 Ground Reflection and Coverage The reinforcement of the direct ray by the ground- reflected ray is of great importance both in radar and in communication work ... reflection coefficient. 52 FACTORS INFLUENCING TRANSMISSION.
Page 53
... reflection which is ineffective in reinforcing the direct wave . The existence of diffuse reflection depends ... coefficient of the sea for plane waves of given frequency . Thus defined , the reflection coefficient can and will be ...
... reflection which is ineffective in reinforcing the direct wave . The existence of diffuse reflection depends ... coefficient of the sea for plane waves of given frequency . Thus defined , the reflection coefficient can and will be ...
Page 54
... reflection coefficient may assume a variety of values . The general formu- las , as derived from electromagnetic theory , are given in equations ( 19 ) and ( 20 ) . For horizontal polarization - R = sin sin + √ cos " cos ization the ...
... reflection coefficient may assume a variety of values . The general formu- las , as derived from electromagnetic theory , are given in equations ( 19 ) and ( 20 ) . For horizontal polarization - R = sin sin + √ cos " cos ization the ...
Page 55
... reflection coefficient for a smooth sea for E¡ = + 60σλ ( 23 ) 200 ( in mhos per meter and X in meters ) . At 25 C the average conductivity of sea water is usually given as .4 63 ما 100MC 3000 MC HORIZONTAL POLARIZATION 180 100 MC 160 ...
... reflection coefficient for a smooth sea for E¡ = + 60σλ ( 23 ) 200 ( in mhos per meter and X in meters ) . At 25 C the average conductivity of sea water is usually given as .4 63 ما 100MC 3000 MC HORIZONTAL POLARIZATION 180 100 MC 160 ...
Common terms and phrases
angle antenna approximately array assumed atmosphere calculation Chapter CHART compared considered constant contour corresponding coverage diagram cross section curve depends determined dielectric diffraction direction distance divergence doublet earth echoes effect elements elevation equal equation equivalent expressed factor field strength Figure formula free space free-space frequency function gain factor given gives ground h₁ h₂ half-wave dipole height Hence horizontal polarization illustrated important increased length less line of sight lobe maximum measured meters method mode noise obtained path difference pattern phase plotted problem propagation radar radiation radiation resistance radio gain radius range ratio rays receiver reflection reflection coefficient refraction region relative represented result scattering sea water shown shows signal sin² standard surface Table tion transmitter unit versus vertical polarization wave wavelength