×

Systems, methods, and apparatus for providing indoor navigation using magnetic sensors

  • US 9,243,918 B2
  • Filed: 03/15/2013
  • Issued: 01/26/2016
  • Est. Priority Date: 12/22/2011
  • Status: Expired due to Fees
First Claim
Patent Images

1. An apparatus comprising:

  • a case including a (i) a first compartment configured to connect to a wheel hub of a wheel of a moveable object, and (ii) a second compartment protruding from the first compartment;

    an absolute position sensor located within the second compartment and including;

    a light detecting sensor which detects uniquely timed pulses of light emitted from a light emitting device in proximity to the moveable object; and

    circuitry configured to determine an identity of the light emitting device in proximity to the moveable object based on the sensed uniquely timed pulses of light; and

    a motion sensor located within the first compartment and including;

    a first magnetic field sensor configured to detect a polarity of a magnet as the magnet passes in proximity to the first magnetic field sensor;

    a code wheel having two or more magnets alternately oriented with north and south polarities facing toward the first magnetic sensor, the code wheel positioned to rotate in unison with the wheel of the moveable object; and

    encoder circuitry configured to determine an amount of rotation of the wheel of the moveable object based on an output of the first magnetic field sensor,wherein the protrusion of the second compartment from the first compartment enables the light detecting sensor to detect the uniquely timed pulses of light.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×