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Altitude estimation using a probability density function

  • US 8,391,889 B2
  • Filed: 06/03/2011
  • Issued: 03/05/2013
  • Est. Priority Date: 06/03/2011
  • Status: Active Grant
First Claim
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1. A method performed by one or more computers, comprising:

  • receiving a plurality of sets of location coordinates from one or more mobile devices, each set of location coordinates being associated with a wireless access gateway;

    determining an effective altitude of the wireless access gateway based on a statistical analysis of the received sets of location coordinates, wherein determining the effective altitude comprises;

    mapping the sets of location coordinates to a plurality of elevation segments;

    selecting one or more elevation segments from the plurality of elevation segments based on a concentration of received location coordinates in each of the elevation segments using;

    a probability density function; and

    a specified outlier threshold for identifying and excluding one or more outliers in the sets of location coordinates; and

    determining the effective altitude using sets of location coordinates in the selected one or more elevation segments; and

    providing the effective altitude to a mobile device for determining an altitude of the mobile device when the mobile device is located within a communication range of the wireless access gateway.

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