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Rain Cell Ratio Technique in Path Attenuation for Terrestrial Radio Links

Authors: Peter Odero Akuon

Abstract:

A rain cell ratio model is proposed that computes attenuation of the smallest rain cell which represents the maximum rain rate value i.e. the cell size when rainfall rate is exceeded 0.01% of the time, R0.01 and predicts attenuation for other cells as the ratio with this maximum. This model incorporates the dependence of the path factor r on the ellipsoidal path variation of the Fresnel zone at different frequencies. In addition, the inhomogeneity of rainfall is modeled by a rain drop packing density factor. In order to derive the model, two empirical methods that can be used to find rain cell size distribution Dc are presented. Subsequently, attenuation measurements from different climatic zones for terrestrial radio links with frequencies F in the range 7-38 GHz are used to test the proposed model. Prediction results show that the path factor computed from the rain cell ratio technique has improved reliability when compared with other path factor and effective rain rate models, including the current ITU-R 530-15 model of 2013.

Keywords: Packing density of rain drops, prediction model, rain attenuation, rain cell ratio technique.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.3299421

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[1] Olsen, R. L., D. V. Rogers, and D. B. Hodge, “The aR^b relation in the calculation of rain attenuation,” IEEE Transaction on Antennas and Propagation, vol. 26, 318-329, 1978.
[2] Crane, R.K., “Prediction of attenuation by rain,” IEEE Trans. Comm., vol. 28, pp. 1717–1733, 1980.
[3] Crane, R.K, “A two-component rain model for the prediction of attenuation statistics,” Radio Science, vol. 17, N.6, 1371-1387, 1982.
[4] G.O. Ajayi and E.B.C. Ofoche, “Some tropical rainfall rate characteristics at Ile-Ife for microwave and millimeter wave application,” J. of Climate and Applied Meteor., vol. 23, pp. 562–567, 1983.
[5] F. Moupfouma, “Improvement of a rain attenuation prediction method for terrestrial microwave links,” IEEE Trans. Antennas Propag., vol. 32, pp. 1368–1372, 1984.
[6] F. Moupfouma, “Rainfall-rate distribution for radio system design,” IEEE proceedings, vol. 134, pp. 527-537, Feb. 1987.
[7] Moupfouma F. “Rain induced attenuation prediction model for terrestrial and satellite earth microwave links,” IEEE, vol.42, 539-550, 1987.
[8] C. K. Crane, Electromagnetic Rain Propagation through rain, John Wiley & Sons, Inc. 1996.
[9] “Propagation prediction techniques and data required for the design of terrestrial line-of-sight systems,” Recommendation ITU-R P.530-15, 2013.
[10] “Characteristics of precipitation for propagation modelling,” ITU-R, Geneva, 2007, ITU-R Rec. P.837-5.
[11] J. Goldhirsh “Rain cell statistics as a function of rain rate for attenuation modelling,” IEEE Trans. Antennas Propag., vol.57, no. 5, pp. 799–801, Sept. 1983.
[12] C. Capsoni, F. Fedi, C. Magistroni, A. Paraboni, A. Pawlina, “Data and theory for a new model of the horizontal structure of rain cells for propagation applications,” Radio Science, vol. 22, n°3, pp. 395-404, 1987.
[13] A. Pawlina-Bonati, “Essential knowledge of rain structure for radio applications based on available data and models,” Proceedings of Radio Africa 99, Gaborone, Botswana, October 1999, pp. 96-106.
[14] M. Binaghi and A. Pawlina Bonati, “Statistical dependence of rain occurrence in multiple site case modelled with dynamical radar derived parameters,” Proc. ISAP 92, Int. Symp. On Antennas and Propag., pp. 1053–1056, Sapporo (Japan), Sept. 1992.
[15] Drufuca G, Zawadzki I., “Statistics of rain gauge data,” Journal of Applied Meteorology, vol. 14, December, pp. 1419- 1429, 1975.
[16] S. Begum, C. Nagaraja, I. Otung, “Analysis of rain cell size distribution for application in site diversity,” IEEE Antennas & Propag., pp.1–5, 2006.
[17] Emilio Matricciani, Apolonia Pawlina Bonati, “Rain cell size statistics inferred from long term point rain rate: model and results,” Proc. Third Ka band utilization conference, Sorrento, Italy,September, 1997.
[18] Sauvageot H. and Mesnard Frederic, “The relation between the area-average rain rate and the rain cell size distribution parameters,” Journal of Atmospheric Science, vol.56, pp. 57-70, Jan. 1999.
[19] T. G. Konrad, “Statistical models of summer rain showers derived from fine-scale radar observations,” J. Appl. Meteor., vol. 17, pp. 171–188, 1978.
[20] R. S. Teno´ rio, H. Sauvageot, and S. Ramos-Buarque, “Statistical studies of rain cell size distribution using radar data during squall line episodes in West Africa,” Proc. Third Int. Symp.on Hydrological Applications of Weather Radar, Sao Paulo, Brazil, 518–526,1995.
[21] K. Naicker and S. H. Mneney, “Propagation measurements and modelling for terrestrial line-of-sight links at 19.5 GHz,” IEEE Africon, Gaborone, Botswana, vol. 01, pp.95–100, Sept.2004.
[22] Assis Mauro S., L. A. R. da Silva Mello and Jorge L. Cerqueira, “Rain attenuation research in Brazil,” URSI GA 2005.
[23] Peter Odero Akuon, “Rain cell size attenuation modelling for terrestrial and satellite radio links,” Master’s Thesis, December 2011, pp. 40-47.
[24] Akuon P. O. and Afullo T. J. O., “Negative power law attenuation estimation for rainy Earth-Space radio links,” Proc. of PIERS symposium, Kuala Lumpur, Malaysia, pp. 270-276, 27th – 30th March. 2012.
[25] Akuon P. O. and Afullo T. J. O., “Path reduction factor modelling for terrestrial links based on rain cell growth,” Proc. of IEEE Africon conference, Livingstone, Zambia, pp. 1-6, 13-15th Sept. 2011. ISBN: 978-1-61284-991-1.
[26] Akuon P. O. and Afullo T. J. O., “Rain cell size statistics from rain gauge data for site diversity planning and attenuation prediction,” Proc. of Southern Africa Telecommunication Networks and Applications Conference (SATNAC), East London, South Africa, pp. 213-216, 4-7th Sept., 2011. ISBN: 978-0-620-50893-3.
[27] Akuon P. O. and Afullo T. J. O., “Rain cell sizing for the design of high capacity radio link systems in South Africa,” Progress in Electromagnetics Research, PIER B, vol. 35, pp. 263-285, 2011.
[28] A.Y. Abdulrahman, T. Abdul Rahman, S.K. Abdulrahim, Md.  Rafiqul Islam “Rain attenuation measurements over terrestrial microwave links operating at 15 GHz in Malaysia,” 2012
[29] L. da Silva Mello and M. S. Pontes, “Unified method for the prediction of rain attenuation in satellite and terrestrial links,” J. Microw., Opto-electron. Electromagn. Appl., vol. 11, no. 1, p. 2012.