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Phase-synchronized buried object transmitter and locator methods and apparatus

  • US 9,927,546 B2
  • Filed: 08/29/2016
  • Issued: 03/27/2018
  • Est. Priority Date: 08/08/2011
  • Status: Active Grant
First Claim
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1. A method for locating buried utilities with a buried object locator, comprising:

  • receiving a magnetic field signal associated with a buried object current, provided from a corresponding transmitter, at the buried object locator;

    wherein the buried object current is generated in the transmitter based on a received terrestrial or satellite signal at the transmitter, wherein the received terrestrial or satellite signal includes or is used to generate timing information, and the transmitter generated current signal is generated with a phase determined at least in part by the timing information;

    independently determining a timing reference at the buried object locator based on a terrestrial or satellite signal received at the buried object locator; and

    determining information about the buried object current based at least in part on the phase of the magnetic field signal and the independently determined timing reference.

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