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Direction detecting device

  • US 5,349,530 A
  • Filed: 07/09/1992
  • Issued: 09/20/1994
  • Est. Priority Date: 07/10/1991
  • Status: Expired due to Fees
First Claim
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1. A direction detecting device comprising:

  • position measurement means for receiving an electric wave from a satellite and for generating first direction data from the electric wave;

    geomagnetic sensor for generating second direction data;

    memory means for storing the first direction data and the second direction data respectively obtained at a previous measurement timing; and

    correction operation means, coupled to said position measurement means, said geomagnetic sensor and said memory means, for obtaining data related to a true magnetic circle from the first direction data and the second direction data stored in said storage means and the first direction data and the second direction data respectively obtained at a current measurement timing and for correcting an error contained in the current second direction data in accordance with the data related to the true magnetic circle.

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