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IJSTR >> Volume 5 - Issue 3, March 2016 Edition



International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616



Analysis Of VHF Propagation Mechanisms That Cause Interference From The Middle East Within The Southern Coastal Regions Of Cyprus

[Full Text]

 

AUTHOR(S)

Antonis Constantinides, Panayiotis Michael

 

KEYWORDS

Abnormal Interference, Propagation Mechanism, Tropospheric Ducting, Refraction.

 

ABSTRACT

Interference is a very important factor in the planning of digital and analog VHF terrestrial radio services. The most common cause of interference in band II & III occurs under line of sight conditions and thus many times can be skipped. Nevertheless, a more complicated case of interference occurs when an unwanted signal travels beyond the horizon due to atmospheric refraction based on specific weather conditions. A case of such abnormal propagation mechanism has been examined in the Mediterranean Sea during the months June, July and August 2015 due to the radio interference which plaguing the southern coast of Cyprus for years. The model based on which calculations were made is the Weather Research Forecasting (WRF-ARW version 3.4). Furthermore, this study utilizes real world measurements in Band II based on current overseas radio transmissions monitored beyond the horizon in clear spectrum during the hot dry months of the summer. The focus was specifically on the field strength variations versus the type of duct favoring the radio waves in Band II, allowing them to travel between the Middle East to beyond the horizon in Cyprus, since line of sight conditions do not exist between the two regions.

 

REFERENCES

[1] D. K. Chy, 'Evaluation of SNR for AWGN, Rayleigh and Rician Fading Channels Under DPSK Modulation Scheme with Constant BER', International Journal of Wireless Communications and Mobile Computing, vol. 3, no. 1, p. 7, 2015.

[2] H. Son, J. Kim and C. Kim, Journal of the Korean institute of electromagnetic engineering and science, vol. 12, no. 1, pp. 94-100, 2012.

[3] M. Nishi, H. Shinbara, K. Shin and T. Yoshida, 'Observation results of non-line-of sight 77.1 MHz FM radio waves on three different paths for three years', Journal of Atmospheric Electricity, vol. 31, no. 1, pp. 11-22, 2011.

[4] 'Terrestrial microwave radio relay system development at frequencies above 10 Ghz', Radio Electron. Eng. UK, vol. 42, no. 4, p. 195, 1972.

[5] RECOMMENDATION ITU-R P.452-11(2003), Prediction procedure for the evaluation of microwave interference between stations on the surface of the Earth at frequencies above about 0.7 GHz

[6] RECOMMENDATION ITU-R P.453-8(2001), The radio refractive index: its formula and refractivity data.

[7] RECOMMENDATION ITU-R P.834-4(2003), Effects of tropospheric refraction on radiowave propagation.

[8] P. Petrov, 'Prediction of interference by modeling a radio interference meter', Measurement Techniques, vol. 37, no. 6, pp. 676-683, 1994.

[9] C. Sim and E. Warrington, 'Signal strength measurements at frequencies of around 300 MHz over two sea paths in the British Channel Islands', Radio Sci., vol. 41, no. 3, p. n/a-n/a, 2006.

[10] `D. Siddle and E. Warrington, 'Diurnal changes in UHF propagation over the English Channel', Electron. Lett, vol. 41, no. 21, p. 1152, 2005.