Multiplex communications – Wide area network – Packet switching
Patent
1988-09-09
1990-05-15
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
3701041, 375 31, 455 67, H04J 314
Patent
active
049264133
ABSTRACT:
The frequency of the broadcasting waves transmitted from the ground broadcasting station and received by an antenna is converted to that of the satellite broadcasting wave by means of a receiving section. The satellite broadcasting wave is transmitted to the ground service area via a transmitting section, radiation selector, reception/transmission multiplexer and antenna. In a case where the new satellite which is to be used instead of the old satellite is placed under the operation test, the satellite broadcasting wave of the transmitter of the new satellite is transmitted into space in a direction other than that towards the earth or absorbed in wave absorbers under the control of the radiation selector so that the satellite broadcasting wave of the old satellite will not be interferred with the satellite broadcasting wave of the new satellite. The command wave from the satellite control station is received by a command reception and telemetry transmission unit via the antenna and reception/transmission multiplexer and processed therein. Then, telemetry data obtained as the result of determining the operation condition of various systems in the satellite are transmitted to the ground satellite control station via the command reception and telemetry transmission unit, reception/transmission multiplexer and antenna.
REFERENCES:
patent: 3649777 (1972-03-01), Matsushima
patent: 3737782 (1973-06-01), Pierce
patent: 4397018 (1983-08-01), Fennel, Jr. et al.
patent: 4633459 (1986-12-01), Blackburn
patent: 4754496 (1988-06-01), Fishkin et al.
BS-2 Spacecraft Design, Toshimichi Ohtake et al., Jun. 1982, 13th ISTS, Tokyo.
Jung Min
Kabushiki Kaisha Toshiba
Olms Douglas W.
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