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High resolution compass card position decoder

  • US 4,414,754 A
  • Filed: 03/04/1982
  • Issued: 11/15/1983
  • Est. Priority Date: 03/04/1982
  • Status: Expired due to Term
First Claim
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1. A high resolution compass card position decoder comprising:

  • a compass having a card mounted for rotation within said compass about an axis perpendicular to said card through the center of said card, said compass card having an inner digital encoding pattern and an outer peripheral pattern arranged with respect to the center of said card, said outer peripheral pattern including a series of lines each running at an angle to a radius of said card from an inner circular position to an outer circular position;

    means along a first predetermined card radius for decoding the angular position of said card from said digital encoding pattern so as to decode gross compass heading; and

    means along a second predetermined card radius for detecting the position along said second radius of one of said lines so as to decode fine compass heading.

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