Mobile device and method for determining location of mobile device

  • US 7,042,391 B2
  • Filed: 12/12/2003
  • Issued: 05/09/2006
  • Est. Priority Date: 09/15/1997
  • Status: Active Grant
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First Claim
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1. A mobile device, comprising:

  • a motion detector for detecting motion of the mobile device, wherein the motion detector generates a Boolean value indicating the mobile device is moving if the detected motion is greater than a threshold amount;

    an orientation detector for determining orientation of the mobile device;

    a memory storing wireless signal strength calibration data comprising a list of wireless signal strength, orientations and known locations;

    an antenna for receiving network radio signals from wireless base stations transmitting in an area;

    a location detection module for measuring a wireless signal strength of any received network radio signals from the antenna and for determining the location of the mobile device using measured wireless signal strength with reference to the wireless signal strength calibration data, motion detection data and orientation data, wherein if the mobile device is moving, the location detection module determines location of the mobile device with reference to instantaneous wireless signal strength; and

    wherein if the mobile device is not moving, the location detection module determines location of the mobile device with reference to statistically corrected measured wireless signal strength received from a location correction module, for applying a statistical correction to the measured wireless signal strength received by the location detection module;

    wherein the location module first considers measured wireless signal strengths taking at the same orientation as determined by the orientation detector for determining location of the mobile device and if no location is determined considers measured wireless signal strengths at other orientations.

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