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Electrical compass

  • US 4,424,631 A
  • Filed: 03/02/1982
  • Issued: 01/10/1984
  • Est. Priority Date: 03/02/1982
  • Status: Expired due to Term
First Claim
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1. A control circuit for use with an electrically operated magnetic field detector employing a flux-gate sensor comprising:

  • an oscillator for providing clock frequency output signals;

    counter means coupled to said oscillator and responsive to said clock frequency signals therefrom for providing an excitation frequency signal for a flux-gate sensor and for providing a synchronization signal at a harmonic frequency of said excitation frequency;

    bandpass filter means coupled to said oscillator and including means for receiving signal information from a flux-gate sensor and responsive to signal information and signals from said oscillator to provide signals at said harmonic frequency of said excitation frequency; and

    detection means coupled to said filter means and to said counter means and responsive to the synchronization signal and signals from said filter means for providing output signals representative of the orientation of a flux-gate sensor to an external magnetic field.

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