SYSTEM AND METHOD FOR ESTIMATING THE POSITION AND ORIENTATION OF A MOBILE COMMUNICATIONS DEVICE IN A BEACON-BASED POSITIONING SYSTEM
First Claim
Patent Images
1. A mobile device, comprising:
- an image sensor;
a compass;
a processor coupled to the image sensor and the compass;
a user interface element comprising a display screen;
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 at least one signal modulated within visible light, wherein;
the visible light is transmitted from a plurality of visible light sources located within a space;
any one signal is modulated within visible light transmitted by a respective one visible light source; and
each signal corresponds to a respective identity of a respective visible light source;
process the one or more images to determine, based at least in part on the at least one signal, an estimated location of the mobile device within the space;
operate the compass to capture a raw heading measurement;
obtain a corrected heading estimate based at least in part on the raw heading measurement; and
operate the user interface element to display a map of the space, the displayed map including a depiction of the estimated location of the mobile device within the space and the displayed map being rotated, based on the corrected heading estimate, to be consistent with a physical orientation of a user of the mobile device within the space.
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Abstract
An example of a technique for compensating for effects of Earth'"'"'s magnetic field variations on a mobile device positioning system. A mobile device utilizes a compass to obtain an absolute heading when located relative to a visible light source. The mobile device obtains a heading correction value based on an identifier of the visible light source. An orientation of a map displayed on the mobile device is rotated based on the absolute heading and the heading correction value in order to provide an indication of a location of the mobile device properly oriented on the map.
18 Citations
20 Claims
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1. A mobile device, comprising:
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an image sensor; a compass; a processor coupled to the image sensor and the compass; a user interface element comprising a display screen; 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 at least one signal modulated within visible light, wherein; the visible light is transmitted from a plurality of visible light sources located within a space; any one signal is modulated within visible light transmitted by a respective one visible light source; and each signal corresponds to a respective identity of a respective visible light source; process the one or more images to determine, based at least in part on the at least one signal, an estimated location of the mobile device within the space; operate the compass to capture a raw heading measurement; obtain a corrected heading estimate based at least in part on the raw heading measurement; and operate the user interface element to display a map of the space, the displayed map including a depiction of the estimated location of the mobile device within the space and the displayed map being rotated, based on the corrected heading estimate, to be consistent with a physical orientation of a user of the mobile device within the space. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method, comprising steps to:
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capture, via an image sensor of a mobile device, one or more images including at least one signal modulated within visible light, wherein; the visible light is transmitted from a plurality of visible light sources located within a space; any one signal is modulated within visible light transmitted by a respective one visible light source; and each signal corresponds to a respective identity of a respective visible light source; process the one or more images to determine, based at least in part on the at least one signal, an estimated location of the mobile device within the space; capture, via a compass of the mobile device, a raw heading measurement; obtain a corrected heading estimate based at least in part on the raw heading measurement; and display, via a user interface element of the mobile device, a map of the space, the displayed map including a depiction of the estimated location of the mobile device within the space and the displayed map being rotated, based on the corrected heading estimate, to be consistent with a physical orientation of a user of the mobile device within the space. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method, comprising steps to:
for each of a plurality of visible light sources located within a space; capture, via an image sensor of a mobile device, one or more images including a modulated visible light signal transmitted from the respective visible light source; process the one or more images to determine, based at least in part on the modulated visible light signal, an estimated location of the mobile device within the space; capture, via a compass of the mobile device, a raw heading of the mobile device; determine a heading of the mobile device relative to a previously orientated map of the space; determine, based on a deviation between the raw heading of the mobile device and the heading of the mobile device relative to the previously orientated map of the space, a heading correction value; and record the heading correction value in association with the estimated location of the mobile device. - View Dependent Claims (18, 19, 20)
Specification