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Methods and applications for altitude measurement and fusion of user context detection with elevation motion for personal navigation systems

  • US 8,566,032 B2
  • Filed: 10/30/2009
  • Issued: 10/22/2013
  • Est. Priority Date: 10/30/2009
  • Status: Expired due to Fees
First Claim
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1. A method comprising:

  • receiving data corresponding to a user'"'"'s position in altitude;

    filtering samples, to remove noise and smooth, of the user'"'"'s altitude data with at least two different order filters each in a time window of respectively different durations to obtain different numbers of filtered samples of the same altitude data corresponding to the two filters;

    automatically determining the user'"'"'s context based on the filtered samples of the received altitude data, the context including whether the user'"'"'s altitude is changing, and if it is changing, a type of motion associated with the changing altitude.

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