## Historical and technical survey |

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Page 37

propagation have the common characteristic that they represent deviations of the

actual earth from the idealized model of a smooth sphere endowed with ...

**Diffraction**by Terrain A number of the influences of the earth's surface upon wavepropagation have the common characteristic that they represent deviations of the

actual earth from the idealized model of a smooth sphere endowed with ...

Page 120

United States. Office of Scientific Research and Development. National Defense

Research Committee. Committee on Propagation. (9) 154

RADIO WAVES Figure 11. Fresnel zones. Figure 20. Cornu spiral. Q, IN. d\ from

Pi is ...

United States. Office of Scientific Research and Development. National Defense

Research Committee. Committee on Propagation. (9) 154

**DIFFRACTION**OFRADIO WAVES Figure 11. Fresnel zones. Figure 20. Cornu spiral. Q, IN. d\ from

Pi is ...

Page 314

... 160-162 Fresnel formulas for reflection coefficient, 32-33 Fresnel integrals for

problems, 133-134 Fresnel zones, 121-123, 158-162 Fresnel-Kirchhoff

theory, ...

... 160-162 Fresnel formulas for reflection coefficient, 32-33 Fresnel integrals for

**diffraction**phenomena, 125-127 Fresnel theory, limitations for**diffraction**problems, 133-134 Fresnel zones, 121-123, 158-162 Fresnel-Kirchhoff

**diffraction**theory, ...

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### Common terms and phrases

altitude Anomalous Propagation antenna attenuation azimuth band characteristic values Committee on Propagation computed constant coverage diagram CUDWR curvature curve decibels decrease determine diffraction diffraction region direct distance Division 14 Report duct earth effect elevation equation equipment experiments factor field intensity field strength free space frequency Fresnel zones functions gradient ground height horizontal humidity index of refraction JEIA land layer lobe angles maximum measurements meter method microwave miles mode moisture NDRC nonstandard propagation NRSL obtained operational optical OSRD path difference pattern permanent echoes phase plane plotted polarization problem radar radar cross section Radio Propagation Radio Waves radius range receiver reflection coefficient refractive index region Research signal strength Snell's law standard atmosphere superrefraction target temperature inversion theory tion transmission transmitter trapping Tropospheric variation vertical Wave Propagation Wave Propagation Group wavelength weather X band zone