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Adaptive multichannel locator system for multiple proximity detection

  • US 7,741,848 B1
  • Filed: 09/13/2007
  • Issued: 06/22/2010
  • Est. Priority Date: 09/18/2006
  • Status: Active Grant
First Claim
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1. A man-portable locator system for locating hidden objects each characterized by an electromagnetic (EM) field emission, the system comprising:

  • a first EM sensor assembly for detecting three orthogonal EM field emission components and producing a set of three time-varying sensor signals {Sx(t), Sy(t), Sz(t)}, including three substantially-identical EM field sensors each having a radial centroid defining a sensing axis, and a structure for supporting the three substantially-identical EM field sensors such that the corresponding sensing axes are disposed in substantial mutual orthogonality;

    a second EM sensor assembly, coupled to and spaced apart from the first EM sensor assembly, for detecting the three orthogonal EM field emission components and producing a second set of three time-varying sensor signals {S′

    x(t), S′

    y(t), S′

    z(t)};

    an analog-to-digital converter (ADC) coupled to the EM sensor assemblies for producing a sequence of digital samples {D(t)} corresponding to time-varying sensor signals;

    a processor coupled to the sequence of digital samples {D(t)} for producing a spectrum signal {P(f)} representing the sensor signal energy within each of a first plurality B of predetermined frequency intervals responsive to the sequence of digital samples {D(t)};

    at least one adaptive filter coupled to the processor for producing a filter output signal F(t) representing the sensor signal energy within each of a second plurality N<

    B of predetermined frequency intervals selected responsive to the spectrum signal {P(f)};

    a proximity detector coupled to the processor for producing a proximity signal d(f) for each of a third plurality B′



    B of predetermined frequency intervals representing the hidden object proximity to one of the EM sensor assemblies; and

    a user interface (UI) coupled to the processor for indicating the presence of one or more hidden objects responsive to the filter output signal F(t).

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