Intersystem analysis of geostationary satellite systems-an alternative approach

Currently the International Frequency Registration Board of the International Telecommunications Union, that is responsible for ensuring the coordinated usage of the radio frequency spectrum, follows a three tier procedure towards registering the internationally coordinated geostationary satellite orbit (GSO) systems. The first step is Advance Publication of Information, the second is Inter System Coordination and the last one is Notification for Registration in the Master Frequency Register. The method employed for examination of interference potential at the first stage is the increase in equivalent satellite link noise temperature and for the second stage there are a variety of methods depending on the transmission carrier type as to whether it is analog or digital, whether one is considering FSS/telephony or BSS/television transmissions and also whether one is computing RF or baseband interference. The prevailing procedures for coordinating a proposed GSO system are complex in themselves. In recognition of this ITU has established a Voluntary Group of Experts to simplify the Radio Regulations. The various involved methods of interference calculations, that have made the whole exercise of intersystem frequency coordination for GSO systems appear, complicated also need to be simplified. Further the advances in modulation technology and earth station miniaturization are driving the satellite services to a common general satellite services (GSS). One common interference calculation method would certainly be a big step towards the intended simplification.<>