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Independent beacon based light position system

  • US 10,024,948 B2
  • Filed: 01/06/2016
  • Issued: 07/17/2018
  • Est. Priority Date: 07/26/2011
  • Status: Active Grant
First Claim
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1. A mobile device, comprising:

  • a rolling shutter camera;

    a wireless interface configured to communicate through a network over a wireless medium;

    a processor coupled to the rolling shutter camera and the wireless interface;

    a memory; and

    software in the memory to be run by the processor, wherein running of the software by the processor configures the mobile device to implement functions, including functions to;

    periodically sample a wireless communication signal received via the wireless interface;

    determine distance parameters based on the wireless communication signal; and

    use the distance parameters to determine that the mobile device is in proximity to an area enabled for visible light positioning;

    in response to the determination, operate the rolling shutter camera to capture one or more images including;

    a first modulated visible light signal transmitted from a first visible light source and a second modulated visible light signal transmitted from a second visible light source;

    demodulate the first and second modulated visible light signals from the captured one or more images to obtain;

    first data carried in the first modulated visible light signal and second data carried in the second modulated visible light signal;

    from the obtained first and second data, determine a first identification of the first visible light source and a second identification of the second visible light source; and

    process the first and second identifications to determine a position of the mobile device.

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