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SYNCHRONIZATION AND POSITION LOCATION SYSTEM

  • US 3,742,498 A
  • Filed: 05/06/1970
  • Issued: 06/26/1973
  • Est. Priority Date: 05/06/1970
  • Status: Expired due to Term
First Claim
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1. A time division multiple access synchronization system to control the transmission of signals from each of a master station and N slave stations to be propagated through at least one common repeater in a selected one of M time slots of a time division multiplex frame format at said repeater, said stations and said repeater having relative motion therebetween, where N is an integer greater than one and M is an integer greater than one but less than N and an even multiple of N, first means disposed in said master station to transmit a master sync burst through said repeater in one of said time slots;

  • second means disposed in said master station responsive to said master sync burst from said repeater to control the production of timing signals employed to control the time of transmission of said master sync and others of said transmitted signals from said master station;

    third means disposed in each of said slave stations responsive to said master sync from said repeater to control the production of timing signals employed to control the time of transmission of said transmitted signals from the associated one of said slave stations;

    fourth means disposed in each of said slave stations coupled to the associated one of said third means to transmit a ranging signal through said repeater in its associated one of said time slots;

    fifth means disposed in said master station coupled to said second means to detect the phase difference between said master sync burst from said repeater and said ranging signal received from said associated one of said slave stations through said repeater;

    sixth means disposed in said master station coupled to said second and fifth means to transmit said phase difference through said repeater in said associated one of said time slots to the associated one of said slave station; and

    seventh means disposed in each of said slave stations coupled to said third means responsive to said phase difference pertinent to the associated one of said slave stations to adjust the phase of said timing signals produced by said third means so that said time of transmission of said transmitted signals from the associated one of said slave stations is such that said transmitted signals occur in the proper one of said time slots at said repeater.

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