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Orientation and navigation device with satellite support

  • US 5,995,023 A
  • Filed: 03/27/1996
  • Issued: 11/30/1999
  • Est. Priority Date: 09/28/1993
  • Status: Expired due to Term
First Claim
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1. An orientation and navigation device for a vehicle, comprising:

  • at least one dead-reckoning sensor, the dead-reckoning sensor including at least one of a magnetic field compass, a vehicle-motion sensor, and an angular position sensor;

    a memory for storing map data;

    a display device;

    a satellite receiver determining a satellite-based position finding; and

    a control unit determining a vehicle position and displaying the vehicle position on the display device, the control unit including an arrangement determining a variation range of the satellite-based position finding, the arrangement including a low-pass filter having a selectable time constant, the selectable time constant being selected as a function of the accuracy of the satellite-based position finding and a vehicle speed, the control unit being coupled to each of the at least one dead-reckoning sensor, the memory, the display device, and the satellite receiver, the control unit(i) determining the vehicle position by computing a dead-reckoning as a function of data from the at least one dead-reckoning sensor,(ii) comparing the dead-reckoning to the variation range,(iii) when the dead-reckoning is outside the variation range of the satellite-based position finding, setting the vehicle position to the satellite-based position finding, performing a plausibility check via a map-matching, and setting the vehicle position to a current position on a street, and(iv) displaying the vehicle position as a current position on the display device.

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