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NAVIGATION DEVICE & METHOD

  • US 20120209507A1
  • Filed: 10/12/2009
  • Published: 08/16/2012
  • Est. Priority Date: 10/12/2009
  • Status: Active Grant
First Claim
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1. A navigation device comprising:

  • a receiver arranged to receive signals from position sensors;

    a memory having stored therein a seed position and map data which comprises a map of navigable routes in an area;

    an output device arranged to output a current location; and

    a processor arranged to determine distance travelled and changes in orientation from the signals and further arranged to estimate the current location on one of the navigable routes of the map data by;

    using the distance travelled and the changes in orientation to extrapolate from the seed position possible paths along the navigable routes that the navigation device may have travelled and assigning to each path a probability that the navigation device travelled that path,for changes in orientation, expanding each path and recalculating the probability that the navigation device travelled that path, andassigning the current location to be a current predicted position on the path with the highest probability and then, for further changes in orientation, expanding each path and recalculating the probability that the navigation device travelled that path.

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