Multiple spot-beam systems for satellite communications
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United States of America Patent
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-
Jun 5, 1990
Grant Date -
N/A
app pub date -
Mar 11, 1988
filing date -
Mar 11, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
On-board satellite switching is performed in three stages, an outer stage of switching on the up-link side for routing the received signals to either demodulators or frequency translators, a first inner stage of switching, preferably a baseband switch and processor, for routing and processing the outputs of the demodulators, a second inner stage of switching, e.g., a microwave switch matrix, for routing the outputs of the frequency translators, and an outer stage on the down-link side for assembling and routing the down-link spot beams. For a multiple hopping-beam system, the outer stages are microwave switch matrices, and for a hybrid scanning-hopping system the outer stages are beam forming matrices. A general purpose modified rearrangeable switch matrix is also disclosed.
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