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Download Free-Space Laser Communications: Principles and Advances by Arun K. Majumdar PDF

By Arun K. Majumdar

This is a complete educational at the rising know-how of free-space laser communications (FSLC). The publication bargains an all-inclusive resource of data at the fundamentals of FSLC, and a evaluation of cutting-edge applied sciences. assurance comprises atmospheric results for laser propagation and FSLC structures functionality and layout. Free-Space Laser Communications is a worthy source for engineers, scientists and scholars attracted to laser verbal exchange structures designed for the atmospheric optical channel.

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8 m1s 2 ) , Ki, is the turbulent exchange coefficient for heat, and 0 is mean potential temperature in degrees Kelvin. 0098h. 4, 1L. is friction velocity, T. is characteristic (or scaling) temperature,

5 m = 10- 14 m- 2/ 3; (3) C~12 . 5 m = 10- 16 m- 2/ 3. 5 m ::; h ::; 50 m C~ (h) = C; 150m (h /50) -4 /3 , 50 m :S h :S 1000 m { C; 11000 m exp [-(h - 1000)/9000J l 1000 m < h (50) {2 3. 5 m :S h:S 1000 m Cn 11000 m exp [-(h - 1000)/9000], 1000 m < h 4. 5 m :S h :S 1000 m C; 11000 m exp [-(h - 1000)/9000]' 1000 m < h (52) C; Sample calculations for profiles corresponding to the Gurvich model are shown in Fig. 6. Insubsequent studies, Gracheva and Gurvich [51] developed the so-called ' simple' models of turbulence, obtained from a large number of experimental measurements: A.

642 tJim(gmt):= y t- (I - 16·«(gmt))·25 2 if P(gmt) :s:: 0 2 l+l . 389 Estimatecharacteristic temperature Tstar . 625 Calculate Refractive Index Structure Parameter Cn2 Estimategradientfor refractive index fluctuations ·= dndz(gmt) . ~hmt)3 . 242 x 10- 13 Appendix B: Calculating Solar Iirradiance and Sensible Heat Flux The incident solar irradiance R and sensible heat flux H can be estimated from the latitude, longitude, date, time of day, and cloud cover as follows. The solar elevation angle (sun's zenith distance) 0: can be obtained from [79] sino: = sin sin <5 + cos cos d coelu ; (BI) where is the latitude, <5 is the solar declination, and li , is the solar hour angle .

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