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Frequency translation correction scheme for satellite communication system

  • US 4,901,368 A
  • Filed: 08/02/1989
  • Issued: 02/13/1990
  • Est. Priority Date: 10/19/1987
  • Status: Expired due to Term
First Claim
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1. For use with a communication system having a first station for transmitting message signals over a communications link to a second station, said communications link subjecting signals transmitted thereover to a modification of a characteristic thereof, a method of enabling message signals transmitted from said first station to be received at said second station without said characteristic modification so that the information contained there in may be recovered at said second station comprising the steps of:

  • at said first station,(a) transmitting a signal over the communications link for reception by the first station;

    (b) monitoring the signal received in step (a) relative to said transmitted signal to determine said modification of a characteristic of signals transmitted over said communications link;

    (c) subjecting message signals, comprising information not related to any portion of said modification of a characteristic of signals over said communications link, to a premodification of said characteristic thereof that is effectively complementary to the monitored modification of the characteristic of signals by said communications link, so that, when transmitted over said communications link from said first station to said second station, message signals that have been premodified are received by said second station effectively free of the modifications imparted by the first station and said communications link; and

    (d) at the second station, determining a preselected characteristic of the received message signals and controlling a preselected characteristic of message signals to be transmitted from the second station to the first station using the determined preselected characteristic of the received message signals.

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