heal.abstract |
The increasing demand for global wideband satellite communication services on vessels has led to applications that enable Earth Stations on board Vessels (ESVs) to use Fixed-Satellite Service (FSS) networks operating in the uplink band 14-14.5 GHz. The broadband communication solution requested from these kinds of vessels can only be provided by using the ESV services - today offered by several telecommunication operators. Transmitting capacity may vary between 19.2 kbit/s up to 1-2 Mbit/s. From the International Radio Regulatory view, in accordance with the Radio Regulations of the International Telecommunication Union, the 14-14.5 GHz band is allocated to the Mobile-Satellite Service (Earth-to-Space), except to the Aeronautical Mobile Satellite Service (AMSS) on a secondary basis, to the Fixed Satellite Service (FSS) on a primary basis in all ITU regions and to the Fixed Service (FS) in many countries through Radio Regulations Article 5 footnotes. Hence, whichever operational frequency for the mobile earth station is chosen within 14-14.5 GHz, there may be a need to consider the potential interference caused to the FS receivers. Particularly, in the case of mobile earth stations installed on vessels, interference problems may be created to the Fixed Service receivers placed near the coastline or on small islands. For countries like Greece, the problem is even more intense since there are many islands where Fixed Service links may be deployed and a great number of vessels equipped with Earth Stations operating in the 14/11 GHz band travel throughout Aegean Sea every day especially during summer. This paper examines the potential interference from earth stations on vessels to Fixed Service receivers in the 14 GHz band when the vessels are traveling close to the coastline. The parameters that have an impact on the interference calculations are presented and simulations are conducted for various realistic interference scenarios. It is shown that, the interference caused to the Fixed Service receivers is negligible if some operational limits are imposed to the vessels equipped with Earth Stations. |
en |