×

POSITION ESTIMATION FOR NAVIGATION DEVICES

  • US 20090248301A1
  • Filed: 03/31/2008
  • Published: 10/01/2009
  • Est. Priority Date: 03/31/2008
  • Status: Active Grant
First Claim
Patent Images

1. A method of providing position estimation with a navigation device, the method comprising:

  • periodically recording magnetic field strength of an area substantially surrounding a navigation device as a user of the navigation device traverses a select pathway;

    combining the recorded magnetic field strength with measurements from at least a dead reckoning portion of the navigation device to provide position estimates along the select pathway; and

    correcting each of the position estimates from a starting position on the select pathway, each of the corrected position estimates having an error value below one or more previous position estimates and any intervening positions between each of the one or more previous position estimates and the starting position, the error value corresponding to an error threshold based on the previous position estimates.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×