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Hybrid navigation system for determining a relative position and direction of a vehicle and method therefor

  • US 4,743,913 A
  • Filed: 02/18/1987
  • Issued: 05/10/1988
  • Est. Priority Date: 02/19/1986
  • Status: Expired due to Term
First Claim
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1. A system mounted on a moving object for determining a position and direction of the moving object relative to a destination, comprising:

  • (a) first means for receiving a navigation electromagnetic wave, calculating coordinate positions of the moving object on the earth on the basis of the received electromagnetic wave, and deriving a running direction of travel in which the moving object advances with respect to an orientation of the geomagnetic field as a reference direction on the basis of the calculated coordinate positions;

    (b) second means for detecting a direction of the moving object with respect to the orientation of the geomagnetic field and an intensity of the geomagnetic field on the moving object;

    (c) third means for correcting a detection result of the second means to compensate for an error due to an effect of magnetization of a body of the moving object itself on the basis of the running direction data derived from the first means;

    (d) fourth means for detecting a distance by which the moving object has moved; and

    (e) fifth means for calculating the relative position and direction of the moving object on the basis of the detection result of the fourth means and corrected detection result of the second means derived from the third means.

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