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Machine having boundary tracking system

  • US 10,036,249 B2
  • Filed: 05/31/2005
  • Issued: 07/31/2018
  • Est. Priority Date: 05/31/2005
  • Status: Active Grant
First Claim
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1. A boundary tracking system for a work site, comprising:

  • a plurality of signal transmitting devices configured to be positioned at underground locations and to originate signals to be transmitted from the underground locations to aboveground having frequencies ranging from about 900 MHz to about 2.4 GHz, wherein the plurality of signal transmitting devices are configured to be activated by a query signal;

    a receiving device configured to be located aboveground and to receive the signals having frequencies ranging from about 900 MHz to about 2.4 GHz that originate from the plurality of signal transmitting devices and to generate an output based on the received signals; and

    a controller configured to determine the underground locations of the plurality of signal transmitting devices based on the output from the receiving device.

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