Navigation system tracking high-efficiency indoor lighting fixtures
First Claim
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1. A mobile device for indoor location determination comprising:
- a first light sensor having a first axis passing through the first light sensor, the first light sensor receiving and measuring light received at a first range of angles with respect to the first axis, the first light sensor having a first angular sensitivity function describing a sensitivity of the first light sensor as a function of angle in the first range of angles over a field of view;
a second light sensor having a second axis parallel to the first axis and passing through the second light sensor, the second light sensor receiving and measuring light received at a second range of angles with respect to the second axis, the second light sensor having a second angular sensitivity function describing a sensitivity of the second light sensor as a function of angle in the second range of angles over the field of view, the second angular sensitivity function being different from the first angular sensitivity function so that an angle of a light measured by the first light sensor and second light sensor may be deduced from a known difference between the first angular sensitivity function and the second angular sensitivity function;
an electronic computer receiving signals from the first and second light sensors and having;
(a) a processor; and
(b) a memory communicating with the processor and holding a program executable by the processor to;
(i) measure signals from the first light sensor and the second light sensor to identify multiple light source signals from multiple light sources using the first and second light sensors within the fields-of-view according to known light source signatures;
(ii) determine an angle of each of the multiple light sources with respect to the mobile device based on a matching of light source signatures and a determination of a difference in the measured signals from the first light sensor and second light sensor of the matched light sources caused by a predetermined differences between the first angular sensitivity function and the second angular sensitivity function of the first and second light sensors respectively; and
(iii) identify the location of the mobile device based on the angle of the multiple light sources and a known mapping of light sources to locations.
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Abstract
A system for identifying the location of a mobile device uses signatures of standard room lighting derived from the frequency spectrum of light fluctuations associated with driver circuitry of that lighting. Improved sensitivity (frequency and dynamic range) are provided by using a pair of dedicated photodetectors which may deduce a one-dimensional angular location of a light source by comparing the signals developed by two photodetectors having different angular sensitivities.
17 Citations
24 Claims
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1. A mobile device for indoor location determination comprising:
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a first light sensor having a first axis passing through the first light sensor, the first light sensor receiving and measuring light received at a first range of angles with respect to the first axis, the first light sensor having a first angular sensitivity function describing a sensitivity of the first light sensor as a function of angle in the first range of angles over a field of view; a second light sensor having a second axis parallel to the first axis and passing through the second light sensor, the second light sensor receiving and measuring light received at a second range of angles with respect to the second axis, the second light sensor having a second angular sensitivity function describing a sensitivity of the second light sensor as a function of angle in the second range of angles over the field of view, the second angular sensitivity function being different from the first angular sensitivity function so that an angle of a light measured by the first light sensor and second light sensor may be deduced from a known difference between the first angular sensitivity function and the second angular sensitivity function; an electronic computer receiving signals from the first and second light sensors and having; (a) a processor; and (b) a memory communicating with the processor and holding a program executable by the processor to; (i) measure signals from the first light sensor and the second light sensor to identify multiple light source signals from multiple light sources using the first and second light sensors within the fields-of-view according to known light source signatures; (ii) determine an angle of each of the multiple light sources with respect to the mobile device based on a matching of light source signatures and a determination of a difference in the measured signals from the first light sensor and second light sensor of the matched light sources caused by a predetermined differences between the first angular sensitivity function and the second angular sensitivity function of the first and second light sensors respectively; and (iii) identify the location of the mobile device based on the angle of the multiple light sources and a known mapping of light sources to locations. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 21, 22, 23, 24)
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15. A method of determining indoor position location using:
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a mobile device having; a first light sensor having a first axis passing through the first light sensor, the first light sensor receiving and measuring light received at a first range of angles with respect to the first axis, the first light sensor having a first angular sensitivity function describing a sensitivity of the first light sensor as a function of angle in the first range of angles over a field of view; a second light sensor having a second axis parallel to the first axis and passing through the second light sensor, the second light sensor receiving and measuring light received at a second range of angles with respect to the second axis, the second light sensor having a second angular sensitivity function describing a sensitivity of the second light sensor as a function of angle in the second range of angles over the field of view, the second angular sensitivity function being different from the first angular sensitivity function so that an angle of a light measured by the first light sensor and second light sensor may be deduced from a known difference between the first angular sensitivity function and the second angular sensitivity function; an electronic computer receiving signals from the first and second light sensors and having; a processor; and a memory communicating with the processor and holding a program executable by the processor to; (i) measure signals from the first light sensor and the second light sensor to identify multiple light source signals from multiple light sources using the first and second light sensors within the fields-of-view according to known light source signatures; (ii) determine an angle of each of the multiple light sources with respect to the mobile device based on a matching of light source signatures and a determination of a difference in the measured signals from the first light sensor and second light sensor of the matched light sources caused by a predetermined differences between the first angular sensitivity function and the second angular sensitivity function of the first and second light sensors respectively; and (ii) identify the location of the mobile device based on the angle of the multiple light sources and a known mapping of light sources to locations;
the method comprising the steps of;(a) creating a map providing the location of multiple light sources within an environment and associating each light source with a light source signature; and (b) using the mobile device to; (i) identify multiple light source signals from the first and second light sensors within the field-of-view according to known light source signatures; (ii) determine an angle of the multiple light sources with respect to the respective axes based on the different angular sensitivities of the first and second light sensors; and (iii) identify the location of the mobile device based on the angle of the multiple light sources on the map. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification