## Historical and technical survey |

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Page 35

The above formulas refer to a plane

account so that the planes relative to which the angle a is measured are replaced

by spheres about the

The above formulas refer to a plane

**earth**. If the**earth's**curvature is taken intoaccount so that the planes relative to which the angle a is measured are replaced

by spheres about the

**earth's**center, formula (13) must be modified; and the ...Page 195

Using the numerical value for the radius of the

the rate of increase of M with height, owing to the term h/a, is (1/a) 106, which is

equal to 0.157 MU per meter (0.048 MU per foot). As the result of a large number

...

Using the numerical value for the radius of the

**earth**, 6.37 X 106 m (21 X 10« ft),the rate of increase of M with height, owing to the term h/a, is (1/a) 106, which is

equal to 0.157 MU per meter (0.048 MU per foot). As the result of a large number

...

Page 197

It has been shown above that a linear variation of refractive index can be

converted into a change of

feasible: to eliminate the

curve. This is ...

It has been shown above that a linear variation of refractive index can be

converted into a change of

**earth's**curvature. The reverse process is equallyfeasible: to eliminate the

**earth's**curvature by using a modified refractive indexcurve. This is ...

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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