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Differential haptic guidance for personal navigation

  • US 9,802,225 B2
  • Filed: 08/12/2014
  • Issued: 10/31/2017
  • Est. Priority Date: 06/27/2005
  • Status: Active Grant
First Claim
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1. An adaptive system for measuring the angular position of a rotating shaft, the system comprising:

  • a field source configured to generate a measurable field;

    a sensor configured to measure the generated field; and

    a target that is configured to modify the generated field as measured by the sensor to have a shape (a) with at least one measurable feature for a zero angular reference, and (b) that varies throughout one or more angles such that a rotational position of the shaft is determined according to a selected angular interval;

    the adaptive system having a first mode of operation for self-calibrating the adaptive system to identify minimum and maximum values of the generated field measured by the sensor; and

    the adaptive system having a second mode of operation using the minimum and maximum values to determine a corresponding angular position of the shaft relative to a preselected position;

    wherein the system is configured to output information of the identified values to a control device to control operation of the shaft.

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