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Clock synchronization for a machine control system

  • US 9,236,966 B2
  • Filed: 11/30/2005
  • Issued: 01/12/2016
  • Est. Priority Date: 11/30/2005
  • Status: Active Grant
First Claim
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1. A clock synchronized control system comprising:

  • a controller configured to;

    control at least one function of a machine;

    select a clock source from among a plurality of external clock sources based on a predetermined order, wherein the plurality of clock sources includes a global positioning system (“

    GPS”

    ) and a low earth orbiting satellite (“

    LEO”

    ), wherein selecting based on the predetermined order includes selecting the GPS before the LEO;

    obtain clock information from the selected clock source; and

    use the obtained information to affect the at least one function of the machine.

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