Closed loop power control for low earth orbit satellite communications system

  • US 5,619,525 A
  • Filed: 06/06/1995
  • Issued: 04/08/1997
  • Est. Priority Date: 06/06/1995
  • Status: Expired due to Term
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First Claim
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1. 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.

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