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Method and Apparatus for Synchronizing Clocks Underwater Using Light and Sound

  • US 20150188695A1
  • Filed: 01/02/2015
  • Published: 07/02/2015
  • Est. Priority Date: 01/02/2014
  • Status: Active Grant
First Claim
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1. A method for synchronizing underwater slave clock devices from a master clock device wirelessly, comprising:

  • transmitting from the master clock device a light pulse and a sound pulse;

    receiving at a slave clock device the light pulse and the sound pulse;

    calculating at the slave clock device, based upon the difference in arrival times of the light pulse and the sound pulse, a distance between the master clock device and the slave clock device;

    calculating at the slave clock device, based upon the distance between the master clock device and the slave clock device, the time at which the light pulse was transmitted from the master clock device;

    applying at the slave clock device a time offset to a clock on the slave clock device based upon a difference between the time that the light pulse was transmitted according to a clock on the master clock device and the calculated light pulse transmission time calculated at the slave clock device.

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