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Navigation device and direction detection method therefor

  • US 5,331,563 A
  • Filed: 11/30/1992
  • Issued: 07/19/1994
  • Est. Priority Date: 12/10/1991
  • Status: Expired due to Fees
First Claim
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1. A navigation device comprising:

  • vehicle condition discriminating means for discriminating whether a vehicle is stopped or not;

    angular velocity detecting means for detecting change of direction of the vehicle and producing angular velocity data on the basis of the detected change of direction;

    absolute direction detecting means for detecting geomagnetism and producing absolute direction data of the vehicle on the basis of the detected geomagnetism;

    offset processing means for producing corrected angular velocity data from said angular velocity data and a first reference value; and

    offset reset means for renewing said first reference value with said angular velocity data when the vehicle is discriminated to be stopped, a change rate of the angular velocity data is within a predetermined second reference value and a change rate of the absolute direction data is within a predetermined third reference value.

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