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Precise absolute time transfer from a satellite system

  • US 8,542,147 B2
  • Filed: 10/06/2011
  • Issued: 09/24/2013
  • Est. Priority Date: 05/30/2008
  • Status: Active Grant
First Claim
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1. A method of transferring precise absolute time from a satellite to a device, the method comprising:

  • receiving data from a messaging channel, wherein the data has a frame structure;

    using the data to identify the satellite and a position of the satellite;

    correcting for signal time of flight using the satellite identity and the position of the satellite;

    using the data as a time reference to align a receiver clock to the frame structure;

    with the receiver clock aligned to the frame structure, receiving a precision time signal from the satellite, wherein the precision time signal comprises a periodic repeating code;

    determining a timing phase of the code; and

    using the timing phase to determine a precise absolute time.

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