초록 ▼

A satellite communication system (10) includes at least one satellite communication signal repeater (12); at least one ground station (18) for transmitting a feeder link comprised of a plurality of communication signals to the at least one satellite communication signal repeater; and a plurality of

A satellite communication system (10) includes at least one satellite communication signal repeater (12); at least one ground station (18) for transmitting a feeder link comprised of a plurality of communication signals to the at least one satellite communication signal repeater; and a plurality of user terminals (13) each receiving one of the communication signals over a user link from the at least one satellite communication signal repeater. The satellite communication system further includes a closed loop power control system (80) having a plurality of inner loops (84), individual ones of which operate to compensate one of the user links for communication signal impairments occurring at least between the user terminal and the at least one satellite communication repeater, and an outer loop (82) which operates to compensate all of the user links for feeder link impairments occurring between the at least one ground station and the at least one satellite communication signal repeater.

대표청구항 ▼

A method for operating a satellite communication system having at least one satellite and at least one ground station, the satellite communication system further having a plurality of ground receivers, comprising the steps of: transmitting a plurality of uplink signals from the ground station, at le

A method for operating a satellite communication system having at least one satellite and at least one ground station, the satellite communication system further having a plurality of ground receivers, comprising the steps of: transmitting a plurality of uplink signals from the ground station, at least one of the uplink signals being designated as an uplink reference signal, said plurality of uplink signals being transmitted with a first frequency from the ground station to the satellite and experiencing a first amount of attenuation between the ground station and the satellite; receiving the plurality of uplink signals with the satellite and repeating the plurality of uplink signals with a second frequency as a plurality of downlink signals that are transmitted from the satellite to the plurality of ground receivers, the second frequency being less than the first frequency such that the plurality of downlink signals experience a second amount of attenuation between the satellite and the plurality of ground receivers, the second amount of attenuation being less than the first amount of attenuation, the plurality of downlink signals being transmitted with a power that is a function of the power of the received plurality of uplink signals; receiving at least the reference signal from the plurality of downlink signals with at least one of the ground receivers, the received reference signal being designated as a received downlink reference signal, and determining from the received downlink reference signal the first amount of attenuation that was experienced at least by the uplink reference signal between the ground station and the satellite; and adjusting a transmitted power of the plurality of uplink signals from the ground station in accordance with the determined amount of attenuation so as to substantially compensate for the first amount of attenuation.