Multiple spot-beam systems for satellite communications

Details Multiple spot-beam systems for satellite communications Multiple spot-beam systems for satellite communications

1988-03-11

1990-06-05

Moskowitz, Nelson

Communications: directive radio wave systems and devices (e.g.,

Directive

Including a satellite

342373, 370 97, 370 57, 455 12, H04B 719

Patent

active

049318020

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.

REFERENCES:
patent: 4254385 (1981-03-01), Childs et al.
patent: 4259741 (1981-03-01), Kawai
patent: 4355388 (1982-10-01), Deal
patent: 4375697 (1983-01-01), Vishner
patent: 4425639 (1984-01-01), Acampora et al.
patent: 4813036 (1989-03-01), Whitehead

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