H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 7/185 (2006.01)
Patent
CA 2165875
A multibeam communications satellite has direct links with at least one other satellite. The satellite's repeater operates in the bent-pipe mode and can provide service to users independent of signal content, format and protocol. Each incoming electromagnetic (radio) beam received by the satellite contains at least one channel of information, and each channel is divisible into subchannels. Naturally, each subchannel is of a bandwidth which is less than the bandwidth of the channel from which the subchannel was derived. The other satellite has outgoing beams that complement the first satellites incoming beams. Generally, both satellites have processors on board designed to interbeam-switch at the subchannel level. (However, a description is given also of an instance where one or the other satellites may not have subchannelizing capability and limited use may be made of the invention). The satellites are linked by an intersatellite link carrying information on a channel consisting of subchannels constituted from several incoming channels. Therefore, an outgoing beam from the second satellite can contain a channel having information combined from several incoming channels to the first satellite and the channel information on any incoming electromagnetic (radio) beam can be delivered at the subchannel level to several output beams from the second satellite. The system can operate in a broadcast mode whereby information at the subchannel level can be distributed simultaneously (i.e. in parallel) to several outgoing electromagnetic (radio) beams. The intersatellite link is treated as any other beam (incoming or outgoing, as the case may be), although its operating wavelength may be different from the operating wavelengths of the beams having terrestrial origin or destination. For example, the intersatellite link could be at microwave, optical or some other suitable frequency. The basic concept may be extended to a system supporting multiple intersatellite links, e.g. links in both directions between the two satellites or, in some circumstances, among a constellation of more than two satellites.
Beauchamp Gary
O'donovan Val
Peach Robert
Bereskin & Parr
Com Dev Limited
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