INTERFERENCE DUE TO HYDROMETEOR SCATTERING ON HORIZONTALLY POLARIZSED SUPER HIGH FREQUENCY (SHF) SIGNAL PROPAGATION IN A TROPICAL LOCATION.

Abstract

This report presents the result of the computation of intersystem interference due to hydrometeors using the simplified Capsoni Three Dimension (3-D) model when horizontally polarized super-high frequency signals propagates through thunderstorm rain type in Nigeria. The results obtained show that transmission loss increases with increasing terrestrial transmitter to common volume distance indicating decreasing probability of severe interference on the satellite system. Also, the frequency characteristics of the transmission loss when transmitter antenna gain is 45dB and time percentage unavailability is greater or equal to 0.01% ( ~ 0.01) shows that transmission loss varies from 121.28dB to 135.58dB for short path lengths while for the long path lengths, it varies from 159.4 to 166.35dB. In addition, evaluation of the effective transmission loss shows that additional rain attenuation along the path will severely weaken the received satellite signal, which may lead to acute signal outage during occurrence of heavy and intense tropical precipitation However, the results of the present work are in good agreement with those of the previous researchers particularly for Nigeria which utilized vertical polarization