Volume:5 Issue:1 Jan ' 2019
||Attenuation Effect of Dust Storm on Port Sudan Microwave Signal Level In Comparison With Some Models
Attenuation Effect of Dust Storm on Port Sudan Microwave Signal Level In Comparison With Some Models
Dust storms are significant meteorological phenomena which occur for a percentage of time in arid and semi-arid areas especially at African and Middle East, and this phenomena affect signal attenuation signal level especially at Ku band and higher frequency with direct impact on telecommunications system performance. A study on dust storm effect on Microwave links in arid area covering a wide range of radiofrequency especially in 18GHZwas running in Khartoum, Sudan. The study used Management system (computerized system) for monitoring transmitted and received signal levels of one microwave links operating at (18GHz) as well as an automatic weather station. This paper presents a description of measurement results and reports for dust storms as they affect the radio wave propagation especially at frequencies above 10GHz, for Port Sudan –Dar Elnaeem link in Port Sudan city. The effect of dust storms on propagation is studied by measuring the storm parameters, visibility and attenuation due to these storms. The measurement results have been compared with the attenuation prediction models like Elshaikh and Goldhirsh Model. Few prediction models have been developed to determine the attenuation due to dust storm in dB/km. All prediction models have assumed that the intensity of dust storm is uniformly distributed around the area covered by the dust storm. However, real dust storm is a complex phenomenon which is difficult to be described by theoretical physical or mathematical models. In this work, we compare between the existing attenuation prediction models based on measured dust storm and measured attenuation in Sudan. The empirical relation found that the measured attenuation is higher than the predicted by the models studied.
||Microwave Line of Sight Transmission
Microwave Line of Sight Transmission
Microwave line of sight transmission is one of several transmission media in modern commutation. Microwave information transmission faces the problem of the effect of environment, and this requires determination of operation condition and design for optimum operation this topic is approached from two stand points: the microwave planning and project implementation. Sinceas a microwave link is a circuit between terminals separated through a great distance, it can be considered as a type of transmission line; but unlike copper or fiber optic cables, terrestrial microwave signals are propagated through the lower atmosphere. Thus they are sensitive to terrain, atmospheric, and climatic conditions adverse to error-free reception. An important part of microwave network is to account for these conditions and provide technical corrections.For optimal operation this paper describesthe operation adjustment required and the suitable design needed so as to minimize and get rid of environmental conditions that lead to optimum performance.