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Progress In Electromagnetics Research Letters
ISSN: 1937-6480
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STATISTICAL INVESTIGATION OF CLEAR AIR PROPAGATION IN THE COASTAL AND PLATEAU REGIONS OF NIGERIA

By I. Emmanuel and B. Adeyemi

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Abstract:
The long-term meteorological data of Era-interim from 1979 to 2014 covering the observation at 00, 06, 12 and 18 have been used to derive vertical refractivity gradient in the lowest 100. Diurnal, seasonal and annual variations of refractivity gradient and its component are analyzed for coastal and plateau areas of Nigeria. The relative frequency of the occurrence of gradient below -100 N-units/km used in clear air propagation study is derived from cumulative distribution of the gradient. Occurrence of anomalous propagation in each region is also estimated. The result will help in the effective wireless link planning and design.

Citation:
I. Emmanuel and B. Adeyemi, "Statistical Investigation of Clear Air Propagation in the Coastal and Plateau Regions of Nigeria," Progress In Electromagnetics Research Letters, Vol. 64, 37-41, 2016.
doi:10.2528/PIERL16092906

References:
1. Karmakar, P. K., L. Sengupta, M. Maiti, and C. F. Angelis, "Some of the atmospheric influences on microwave propagation through atmosphere," American Journal of Scientific and Industrial Research, Vol. 1, No. 2, 350-3458, 3458.
doi:10.5251/ajsir.2010.1.2.350.358

2. Adediji, A. T. and M. O. Ajewole, "Vertical profile of radio refractivity gradient in Akure South-west Nigeria," Progress In Electromagnetics Research C, Vol. 4, 157-168, 2008.

3. Lavergnat, J. and M. Sylvain, Radio Wave Propagation: Principles and Techniques, John Wiley & Sons, ISBN 0-471-49027-X Chichester, UK.

4. Adeyemi, B. and I. Emmanuel, "Monitoring tropospheric radio refractivity over Nigeria using CM --- SAF data derived from NOAA ---15, 16 and 18 satellites," Indian Journal of Radio and Space Physics, Vol. 40, 301-310, 2011.

5. Adeyemi, B., "Tropospheric radio refractivity over three Radiosonde Stations in Nigeria," Ife Journal of Science, Vol. 6, No. 2, 167-176, 2004.

6. Willoughby, A. A., T. O. Aro, and I. E. Owolabi, "Seasonal variations of radio refractivity gradients in Nigeria," Journal of Atmospheric and Solar-Terrestrial Physics, Vol. 64, 417-425, 2002.
doi:10.1016/S1364-6826(01)00111-0

7. Dee, D. P., E. Kallen, A, J. Simmons, and L. Haimberger, "Comments on Reanalysis suitable for characterizing long-term trends," Bull. Amer. Meteorol. Soc., Vol. 92, 65-70, 2011.
doi:10.1175/2010BAMS3070.1

8. ITU-R P.453, "The radio refractivity index: Its formula and refractivity data,", International Telecommunication Union, Geneva, 2012.

9. Elgered, G., H. P. Plag, H. Van der Marel, S. Barlag, and J. Nash, "COST-716, 2004: Exploitation of ground-based GPS for operational numerical weather prediction and climate applications," Institute of Applied Physics, University of Bern, 8-9, 2005.

10. Ruger, J. M., "Refractive index formulae for radio waves," Proceedings, FIG XXII International Congress, Washington DC, Apr. 19-26, 2002.

11. Thayer, G., "An improved equation for the radio refractive index of air," Radio Science, Vol. 9, No. 10, 803-807, 1974.
doi:10.1029/RS009i010p00803

12. Sonntag, D., "Important new values of the physical constants of 1986, vapour pressure formulations based on the ITS-90 and psychrometer formulae," Zeitschrift f¨ur Meteorologie, Vol. 40, No. 5, 340-344, 1990.

13. Buck, A. L., "New equations for computing water vapor pressure and enhancement factor," J. Appl. Meteor., Vol. 20, 1527-1532, 1981.
doi:10.1175/1520-0450(1981)020<1527:NEFCVP>2.0.CO;2

14. Dominguez, M. A., A. Benarroch, and J. M. Riera, "Refractivity statistics in Spain: First results,", COST 255, CP52004, May 1998.

15. Manning, T., "Microwave radio transmission design guide," Artech House Microwave Library, 2nd Edition, 129-224, 2009.

16. Adediji, A. T., M. O. Ajewole, S. E. Falodun, and O. R. Oladosu, "Radio refractivity measurement at 150m altitude on TV tower in Akure, south-west Nigeria," Journal of Engineering and Applied Sciences, Vol. 2, No. 8, 1308-1313, 2007.

17. Adedokun, J. A., "West African precipitation and dominant atmospheric mechanisms," Arch. Met. Geoph. Biokl., Ser. A, Vol. 27, 289-310, 1978.
doi:10.1007/BF02247952

18. AbouAlmal, A., R. A. Abd-Alhameed, S. M. R. Jones, and H. Al-Ahmad, "New methodology for predicting vertical atmospheric profile and propagation parameters in subtropical arabian gulf region," IEEE Trans. Antennas Propag., Vol. 63, No. 9, 4057-4068, Sep. 2015.
doi:10.1109/TAP.2015.2452937


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