Title :
Estimation of refractivity structure parameter (Cn/sup 2/)
Author :
Jassal, B.S. ; Tewari, R.K. ; Roy, Manujendra N.
Author_Institution :
Defense Electron. Applications Lab., Dehra Dun, India
Abstract :
Refractivity structure parameter (Cn/sup 2/) statistics have been derived from radio data collected over a double knife-edge diffraction path. The cumulative distribution and diurnal variation of Cn/sup 2/ are studied, and the results are compared with those reported in the literature. Propagation measurements are conducted on the experimental link between Roorkee (265 m above MSL) and Dehradun (677 m above MSL) in India. The Cn/sup 2/ values obtained from the radio data were found to be log-normally distributed with large diurnal variations. The maximum Cn/sup 2/ occurred during midday and midnight hours, due to the combined effect of the temperature gradient and mechanical turbulence in the atmosphere. The range of Cn/sup 2/ values thus evaluated was found to be within those reported by others. It was inferred that if Cn/sup 2/ values are evaluated from the available meteorological parameters, they could be used to predict the fading behavior of any tropospheric terrestrial communication link planned in that area.<>
Keywords :
electromagnetic wave refraction; fading; radio links; radiowave propagation; statistical analysis; tropospheric electromagnetic wave propagation; Dehradun; India; Roorkee; atmosphere; cumulative distribution; diurnal variation; double knife-edge diffraction path; fading; log normal distribution; mechanical turbulence; meteorological parameters; propagation measurements; radio data; radiowave propagation; refractivity structure parameter; statistics; temperature gradient; tropospheric terrestrial communication link; Antenna measurements; Atmospheric measurements; Diffraction; Fluctuations; Radar scattering; Refractive index; Stability; Statistical distributions; Telecommunications; Terrestrial atmosphere;
Conference_Titel :
Antennas and Propagation Society International Symposium, 1990. AP-S. Merging Technologies for the 90's. Digest.
Conference_Location :
Dallas, TX, USA
DOI :
10.1109/APS.1990.115487
