| 摘要 |
A satellite communications system where a satellite acts as a relay between a user terminal and an earth station, comprises a satellite (10) which is partitioned to provide two or more sets of frequencies, each with its own antenna pattern, provided from a common antenna array. Each partition is independent of any other, can comprise a forward path and a return path, and can be operated from the same, or another, earth station. A partition can, independently, support any type of modulation or coding. In the example given, one partition provides a cellular telephone system using a plurality of spot beams (30), while another partition supports a slow data system using a single, global beam (108).
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