DocumentCode :
743682
Title :
Real-time measurement of meteorological parameters for estimating low-altitude atmospheric turbulence strength (Cn2)
Author :
Bazil Raj, Anthonysamy Arockia ; Selvi, James Arputha Vijaya ; Raghavan, Singaravelu
Author_Institution :
Laser Commun. Lab. (LCL), Kings Coll. of Eng., Thanjavur, India
Volume :
8
Issue :
6
fYear :
2014
Firstpage :
459
Lastpage :
469
Abstract :
The major factor that limits the performance of Free Space Optical Communication is atmospheric turbulence which fluctuates over time in accordance with the variations in local meteorological parameters. Estimating the atmospheric turbulence strength Cn2 with the measurement data becomes significant to find the data rate the system is capable of operating under different outdoor local environmental conditions. Hence, a low cost customised system for continuously measuring the local meteorological data is developed and presented in this study. A field test scintillometer setup is established for a link range of 0.5 km at an altitude of 15.25 m. Specialised sensors are interfaced to the digital architectures to acquire the real-time data corresponding to atmospheric changes. The accuracy and performance of the measurement system are tested against standard instruments and the maximum correlation coefficients of 99.92, 99.63, 99.73 and 99.88% are achieved for wind speed, temperature, relative humidity and pressure, respectively. An experimental model to estimate Cn2 using measured meteorological data is developed and the atmospheric turbulence strength is estimated. The validations of the estimated results with the scintillometer measurement are also analysed. The weather profile and corresponding Cn2 variations at our test field for different seasons in 1 year period are presented and the results are analysed.
Keywords :
atmospheric turbulence; digital instrumentation; meteorological instruments; optical communication; altitude 15.25 m; digital architectures; fleld test scintillometer setup; free space optical communication; low-altitude atmospheric turbulence strength; maximum correlation coefflcients; meteorological parameters; pressure; real-time measurement; relative humidity; weather proflle; wind speed; wind temperature;
fLanguage :
English
Journal_Title :
Science, Measurement & Technology, IET
Publisher :
iet
ISSN :
1751-8822
Type :
jour
DOI :
10.1049/iet-smt.2013.0236
Filename :
6985872
Link To Document :
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