Multiplex communications – Wide area network – Packet switching
Patent
1986-08-07
1989-06-06
Griffin, Robert L.
Multiplex communications
Wide area network
Packet switching
375 1, 375102, 375 38, 380 34, H04J 110, H04B 1500
Patent
active
048377864
ABSTRACT:
A system for data communication between ground stations using an orbiting satellite as a relay includes a technique for avoiding the loss of signals from the satellite during periods of heavy precipitation. Data is communicated from an orbiting satellite to a plurality of earth stations on a single transmission frequency. The data is communicated on two separate transmission channels on that one frequency by using orthogonal channels of a coherent phase quadrature transmission system. The overall data rate on one of the two transmission channels is much lower than the overall data rate on the other of the two channels. The data on the lower data rate channel is less likely to be affected by heavy precipitation occurring in the line of sight between the satellite and the ground station, and the lower data rate channel is thus used to communicate data to a ground station located in an area of heavy precipitation. The lower data rate channel is further used to maintain phase synchronization so that the probability of losing phase synchronization with the signal transmitted by the satellite is significantly reduced.
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John Hu
Gurantz Itzhak
Wright David A.
Comstream Corporation
Griffin Robert L.
Telesz Jr. Andrew J.
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