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Enhanced precise location

  • US 8,515,690 B2
  • Filed: 05/25/2012
  • Issued: 08/20/2013
  • Est. Priority Date: 05/18/2007
  • Status: Active Grant
First Claim
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1. A line locator, comprising:

  • a plurality of coil detectors, each of the plurality of coil detectors oriented to measure a component of an electromagnetic field;

    circuitry coupled to provide quadrature signals indicating a complex electromagnetic field strength;

    a position locator for indicating a position of the line locator;

    a processor coupled to receive the complex electromagnetic field strength and the position, and to calculate values related to a target line, whereinthe processor is configured to execute instructions for;

    modeling an expected complex field strength using a phase error function, and using an estimation of a current attenuation at two nearest side tones to update a fit factor, the side tones defined by a carrier frequency and a modulation frequency; and

    determining parameters related to the target line from a best model.

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