Determination and Comparative Analysis of Refractivity Profile and Fade Depth for Microwave Links in Lagos
International Journal of Information and Communication Sciences
Volume 1, Issue 3, December 2016, Pages: 59-62
Received: Oct. 17, 2016;
Accepted: Dec. 28, 2016;
Published: Jan. 16, 2017
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Udofia Kufre. M., Department of Electrical/Electronic and Computer Engineering, University of Uyo, Akwa Ibom, Nigeria
Ogungbemi Emmanuel Oluropo, Department of Electrical/Electronic and Computer Engineering, University of Uyo, Akwa Ibom, Nigeria
Etokebe Iniobong Jackson, Department of Electrical/Electronic and Computer Engineering, University of Uyo, Akwa Ibom, Nigeria
The concept of radio link design and planning remain very vital to a radio link engineer and so the need to have a clear information outlook of the refractivity profile and fade depth of that location. In this study, radiosonde data from 2012 to 2014 was used to estimate the point refractivity gradient and fade depth for Lagos located 6.4531° N, 3.3958°E South West of Nigeria. The refractivity gradient for Lagos from the distribution table showed the highest occurrence in December with dN1 of -56.4268.1N units and February with the lowest dN1 having -398.5034N units while the fade depth for the different models also showed monthly and seasonal variations, with fade depth of 142.03 dB for the ITU-R P.530-9 model, 132.051 dB for the ITU-R P.530-14 model and 156.861 dB for the ITU-R P.530-16 model.
Udofia Kufre. M.,
Ogungbemi Emmanuel Oluropo,
Etokebe Iniobong Jackson,
Determination and Comparative Analysis of Refractivity Profile and Fade Depth for Microwave Links in Lagos, International Journal of Information and Communication Sciences.
Vol. 1, No. 3,
2016, pp. 59-62.
V. Serdega and G. Ivanovs, Refraction seasonal variation and that influence on to GHz range microwaves availability. Elektronika ir Elektrotechnika, 78 (6), 39-42 (2015).
T. R. Rao, V. B. Rao, M. V. S. N. Prasad, S. K. Sarkar and D. R. Lakshmi, Effect of sea breeze on propagation characteristics over a LOS microwave link located in Indian south-east coast. Indian Journal Of Radio And Space Physics, 28 (3), 113-118 (1999).
E. E. O'Marr, Atmospheric effects on signal propagation in adverse environmental conditions a validation of the advanced refractive effects prediction system (Doctoral dissertation, Monterey, California. Naval Postgraduate School). (2008).
S. P. Mason, Atmospheric effects on radio frequency (RF) wave propagation in a humid, near-surface environment. Naval Postgraduate School Monterey Ca. (2010).
E. Valma, Tamosiunaite, M., Tamosiunas, S., Tamosiuniene, M., & Zilinskas, M. Variation of radio refractivity with height above ground. Elektronika ir Elektrotechnika, 111 (5), 23-26. (2011).
E. B. Ugwu, M. C. Umeh, O. J. Ugonabo, Microwave propagation due to earth’s atmosphere at very high frequency(VHF) and ultra high frequency(UHF) bands in Nsukka under clear-air condition. International Journal of Physical sciences. vol 10 (11),pp.359-363(2015).
O. Ojo, M. Ajewole, A. Adediji and J. Ojo, Estimation Of Clear-Air Fades Depth Due To Radio Climatological Parameters For Microwave Link Applications In Akure, Nigeria. International Journal of Engineering, 7 (03), 8269 (2015).
N. N. Chigbu M. I Onogu, G. O Ajayi, Characteristics of microwave propagation in vapourised atmosphere. Global journal of mathematics sciences, Vol.3 (2),123-136 (2004).
B. G. Ayantunji and M. C. Umeh Statistical study of the dependence of tropospheric refractive index on different weather vagaries. AFRICON2013. IEEE2013: 133-180 (2010).
M Grabner, V Kvicera, P. Pechac First and second order statistics of clear-air attenuation on 11GHz terrestrial path.6th European conference on antennas and propagation (EUCAP). IEEE: pp. 2401-2404(2011).
ITU-R F.1093-1 Effects of multipath propagation on the design and operation ofline-of-sight digital radio-relay systems. Rec. ITU-R F.1093-1, 1997(1997).
B. L. Agba, O. Ben-Sik-Ali, R. Morin and G. Bergeron, Recent evolution of ITU method for prediction of multipath fading on terrestrial microwave links. Progress in Electromagnetics Res. Symposium Proc. Marrakesh, Morocco, Mar. 20-23: 1375(2011).
M. Zilinskas, M. Tamosiunaite, M. Tamosiuniene, E. Valma, and S. Tamosiunas, Gradient of radio refractivity in troposphere. In Progress In Electromagnetics Research Symposium Proceedings, Moscow, Russia, August (pp. 19-23) (2012, August).
M. O Asiyo and T. J. Affulo, Tropospheric propagation mechanisms influencing multipath fading based on local measurements; in proc. of Southen Africa telecommunication networks and applications conference, Fancourt, George, South Africa (2012).
J. S. Seybold, Introduction to RF propagation. WileyInterscience. John Willey and Sons, Inc.: pp. 116-118 (2005).
Y. Bettouche, B. L. Agba and A. B. Kouki, Geoclimatic factor and point refractivity evaluation in Quebec-Canada. In General Assembly and Scientific Symposium (URSI GASS), 2014 XXXIth URSI (pp. 1-4). IEEE (2014, August).
A. AbouAlmal, R. A. Abd-Alhameed, K. Al-Ansari, H. AlAhmad, C. H. See, S. M. Jones and J. M. Noras, Statistical analysis of refractivity gradient and parameter in the Gulf Region. Antennas and Propagation, IEEE Transactions on, 61 (12), 6250-6254 (2013).
O. Agunlejika and T. I. Raji, Validation of ITU–R model for atmospheric refractivity profile in a tropical region. International Journal of Engineering and Applied Sciences (IJEAS), 2 (4), 72-82 (2010).