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Method for synchronizing the pulse frames in time multiplex data transmission via communication satellites

  • US 4,004,225 A
  • Filed: 05/20/1975
  • Issued: 01/18/1977
  • Est. Priority Date: 05/21/1974
  • Status: Expired due to Term
First Claim
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1. A method for synchronizing the pulse frames occurring during the transmission of time multiplex pulse coded data between the stations of a multi-station communication system via the transponder of a communications satellite in which each pulse frame includes a code sequence (SRUW) periodically transmitted by one of the stations which functions as a reference station and pulse bursts transmitted in a prescribed sequence by the other stations of the system, and wherein a plurality of the stations of the system, which plurality is less than the total number of stations of said system, are utilizable as active reference stations with only one station of said system being an active reference station at any time, comprising:

  • causing all of said stations utilizable as reference stations to periodically transmit their own code sequences (SRUW) at the beginning of successive pulse frames;

    synchronizing the coded sequence from each of said stations utilizable as reference stations with the coded sequence of the presently active reference station;

    synchronizing the time of transmission of the pulse bursts of the other stations of said system with the code sequence of any one of said stations utilizable as a reference station; and

    in the event of malfunction whereby the coded sequence from the presently active reference station is not received by the stations utilizable as a reference station, changing the one of said stations utilizable as a reference station which operates as the active reference station.

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