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Multifrequency locating arrangement with frequency designation

  • US 7,990,150 B2
  • Filed: 04/16/2010
  • Issued: 08/02/2011
  • Est. Priority Date: 06/01/1999
  • Status: Expired due to Fees
First Claim
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1. In a system in which a transmitter is moved through the ground in a region, said system including a locating arrangement for tracking the position of and/or guiding the transmitter as the transmitter moves through the ground, said locating arrangement comprising:

  • a configuration, forming part of said transmitter, for transmitting a locating signal at a current one of at least two locating frequencies and for transmitting a frequency designation identifying one of said frequencies of the locating signal; and

    a locator which receives the frequency designation and the locating signal for use in tracking the transmitter and including a frequency tracking arrangement for switching the locator between different ones of the locating frequencies, as the current locating frequency, based on said frequency designation.

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