Abstract
If the 1970s were the decade of fixed communications satellite systems, the 80s and 90s seem to be the era of the mobile satellite. Until now, only one commercial mobile satellite system has been in operation—INMARSAT. Now, however, a number of other systems are on various drawing boards around the world. Competition will likely bring benefits to the mobile satellite sector but at the same time, the proliferation of separate systems will not be without problems. Not the least of the problems associated with a multiplicity of separate mobile satellite systems will be that of frequency and orbital coordination. This paper outlines the difficulties of geostationary and frequency coordination in the mobile satellite world and, using INMARSAT as a model, explores the benefits of multi-user satellite systems as a means of resolving these difficulties.
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