System and method for estimating the position and orientation of a mobile communications device in a beacon-based positioning system
First Claim
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1. 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, wherein;
a physical location of the lighting device within the space corresponds to a location defined by an x,y coordinate system over a planar area encompassing the space;
a frequency of a first of the at least two superimposed sinusoids has a defined relationship to a value of an x coordinate of the physical location of the lighting device in the x,y coordinate system; and
a frequency of a second of the at least two superimposed sinusoids has a defined relationship to a value of a y coordinate of the physical location of the lighting device in the x,y coordinate system.
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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.
22 Citations
24 Claims
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1. A lighting device, comprising:
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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, wherein; a physical location of the lighting device within the space corresponds to a location defined by an x,y coordinate system over a planar area encompassing the space; a frequency of a first of the at least two superimposed sinusoids has a defined relationship to a value of an x coordinate of the physical location of the lighting device in the x,y coordinate system; and a frequency of a second of the at least two superimposed sinusoids has a defined relationship to a value of a y coordinate of the physical location of the lighting device in the x,y coordinate system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method, comprising steps to:
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emit, by an artificial light source, visible artificial light for general illumination within a space; and modulate, by a modulator, the intensity of visible artificial light emitted by the light source to simultaneously broadcast at least two superimposed sinusoids modulated on the emitted visible artificial light, wherein; a physical location of the artificial light source within the space corresponds to a location defined by an x,y coordinate system over a planar area encompassing the space; a frequency of a first of the at least two superimposed sinusoids has a defined relationship to a value of an x coordinate of the physical location of the artificial light source in the x,y coordinate system; and a frequency of a second of the at least two superimposed sinusoids has a defined relationship to a value of a y coordinate of the physical location of the artificial light source in the x,y coordinate system. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A mobile device, comprising:
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an image sensor; a wireless interface configured to communicate through a network over a wireless medium; a processor coupled to the image sensor 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; operate the image sensor to capture one or more images including a modulated visible light signal transmitted from a visible light source located within a space, the modulated visible light signal including at least two superimposed sinusoids; demodulate the modulated visible light signal from the captured one or more images to obtain at least; a frequency of a first of the at least two superimposed sinusoids; and a frequency of a second of the at least two superimposed sinusoids; infer, based at least in part on the obtained frequencies, a value for an x coordinate, the x coordinate being part of an x,y coordinate system over a planar area encompassing the space; infer, based at least in part on the obtained frequencies, a value for a y coordinate, the y coordinate being part of the x,y coordinate system; and determine, based on the inferred x and y coordinates, a physical location of the visible light source. - View Dependent Claims (18, 19, 20, 21)
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22. A method, comprising steps to:
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capture, via an image sensor of a mobile device, one or more images including a modulated visible light signal transmitted from a visible light source located within a space, the modulated visible light signal including at least two superimposed sinusoids; demodulate the modulated visible light signal from the captured one or more images to obtain at least; a frequency of a first of the at least two superimposed sinusoids; and a frequency of a second of the at least two superimposed sinusoids; infer, based at least in part on the obtained frequencies, a value for an x coordinate, the x coordinate being part of an x,y coordinate system over a planar area encompassing the space; infer, based at least in part on the obtained frequencies, a value for a y coordinate, the y coordinate being part of the x,y coordinate system; and determine, based on the inferred x and y coordinates, a physical location of the visible light source. - View Dependent Claims (23, 24)
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Specification