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US 9,791,543 B2Granted
System and method for estimating the position and orientation of a mobile communications device in a beacon-based positioning system
AssigneeABL IP Holding LLC
InventorsDaniel Ryan, Kelby Edward Green, Emanuel Paul Malandrakis, Konstantin Klitenik
Life of this patent
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Abstract
An example of a lighting device including a light source, a modulator and a processor. The processor is configured to control the light source to emit light for general illumination and control the modulator to modulate the intensity of the emitted light to superimpose at least two sinusoids. Frequencies of the at least two sinusoids enable a mobile device to infer the physical location of the lighting device.
Claims25
A lighting device, comprising:
- a light source;
- a modulator coupled to the light source;
- and
- a processor coupled to the modulator and configured to:
- control the light source to emit visible light for general illumination within a space;
- and
- control the modulator to:
- modulate the intensity of visible light emitted by the light source based on a signal comprising at least two superimposed sinusoids and in accordance with at least two frequencies of the at least two superimposed sinusoids such that the at least two superimposed sinusoids are simultaneously broadcast;
- sweep across the respective frequency of a first of the at least two superimposed sinusoids during a respective sweep cycle that spans a timeframe of a respective sweep period by:
- varying the frequency of the first of the at least two superimposed sinusoids, between a number of varied frequencies and within a frequency modulation range, during each of a plurality of sub-cycles of the sweep cycle, each sub-cycle corresponding to a respective fraction of the timeframe;
- and
- maintaining each respective varied frequency of the first of the at least two superimposed sinusoids during a respective sub-cycle for the respective fraction of timeframe, each fraction of the timeframe corresponding to the respective sub-cycle such that the collection of fractions of the timeframe for the respective number of varied frequencies of the respective sweep cycle equals the timeframe of the respective sweep period.
9 more elements
A method, comprising steps to:
- operate an artificial light source to emit visible artificial light for general illumination within a space;
- and
- modulate, based on a signal comprising at least two superimposed sinusoids, the intensity of visible artificial light emitted by the light source to broadcast a modulated visible light signal including the at least two superimposed sinusoids modulated on the emitted visible artificial light;
- sweep across the respective frequency of a first of the at least two superimposed sinusoids during a respective sweep cycle that spans a timeframe of a respective sweep period by:
- varying the frequency of the first of the at least two superimposed sinusoids, between a number of varied frequencies and within a frequency modulation range, during each of a plurality of sub-cycles, each sub-cycle corresponding to a respective fraction of the timeframe;
- and
- maintaining each respective varied frequency of the first of the at least two superimposed sinusoids during a respective sub-cycle for the respective fraction of the timeframe, each fraction of the timeframe corresponding to the respective sub-cycle such that the collection of fractions of the timeframe for the respective number of varied frequencies of the respective sweep cycle equals the timeframe of the respective sweep period.
4 more elements
Dependencies are inferred from the claim text.