Год выпуска: 2012 Автор: Gabriel Friday Ibeh and Godwin Amechi Agbo Издательство: LAP Lambert Academic Publishing Страниц: 80 ISBN: 9783659135224
Описание
The refractivity profile variation in tropospheric is one of the aspects that influences long-distance terrestrial electromagnetic wave propagation and performance of communication systems. This study is aimed at calculation and estimation of refractivity with tropospheric parameters of relative humidity, absolute temperature and atmospheric pressure using ITU-R model and artificial neural network model for January and October at Minna and Abuja, Nigeria. Validation results are thus, January at Minna: absolute temperature = 0.4313 K, relative humidity = 0.9989 %, pressure = 0.0201 (hpa), and October: absolute temperature = - 0.3146 K, relative humidity = 0.9597 % and pressure = 0.1962 respectively. While January at Abuja: absolute temperature = 0.6907 K, relative humidity = 0.9929 %, pressure = 0.3947 (hpa), and October: absolute temperature = - 0.4291 K, relative humidity = 0.9452 and pressure = -0.5344 respectively. The validation of the correlation coefficient results shows that...
