## Historical and technical survey |

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Page 226

Chapter 19

assumptions and restrictions underlying this presentation are: 1. We concern

ourselves with problems of the diffraction region only: the field is calculated at ...

Chapter 19

**CHARACTERISTIC VALUES**FOR THE FIRST MODE FOR THE. Theassumptions and restrictions underlying this presentation are: 1. We concern

ourselves with problems of the diffraction region only: the field is calculated at ...

Page 237

Here the

functions Un(z) satisfy the equation ^ + A:1 [sin2 a + M*\ U = 0 dz (3) •By Lt. W. F.

Eberlein, USNR, Office of the Chief of Naval Operations. plus the boundary and ...

Here the

**characteristic values**sin2a„ and the (normalized) characteristicfunctions Un(z) satisfy the equation ^ + A:1 [sin2 a + M*\ U = 0 dz (3) •By Lt. W. F.

Eberlein, USNR, Office of the Chief of Naval Operations. plus the boundary and ...

Page 257

8 = 2d L L is an abbreviation for (aX2/ 6ir2) ' and is equal to 33 ft for X = 10 cm, In

is the

the parabolic case, h(z) is (|) 2W,<2>(^), //j<21 is the Hankel function of second ...

8 = 2d L L is an abbreviation for (aX2/ 6ir2) ' and is equal to 33 ft for X = 10 cm, In

is the

**characteristic value**for the standard case, 7m is the**characteristic value**forthe parabolic case, h(z) is (|) 2W,<2>(^), //j<21 is the Hankel function of second ...

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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