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Signal processing to extract a pedestrian's moving direction

  • US 9,295,027 B2
  • Filed: 03/26/2013
  • Issued: 03/22/2016
  • Est. Priority Date: 03/26/2013
  • Status: Active Grant
First Claim
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1. A method of determining a moving direction of a mobile device, the method comprising:

  • determining, by a processor, an acceleration signal associated with the mobile device, the acceleration signal three dimensions including a first dimension extending generally along a North-South direction, a second dimension extending generally along an East-West direction; and

    a third dimension extending generally along a direction of Earth'"'"'s gravity;

    fitting the acceleration signal in each of the first, second and third dimensions to first, second, and third sinusoidal functions, respectively;

    modeling, with the processor, acceleration in the moving direction using a fourth sinusoidal function based on the first and second sinusoidal functions; and

    determining the moving direction based on a phase of the third sinusoidal function and a phase of the fourth sinusoidal function.

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