Learning, storing, analyzing, and reasoning about the loss of location-identifying signals
First Claim
1. A system that facilitates shadow mapping, comprising:
- a processing component that processes location information received from a wireless receiving device; and
an analysis component that facilitates generation of a shadow map of a communications shadow based on the location information.
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Accused Products
Abstract
A location-centric signal shadow mapping and storing architecture that creates maps where signals, such as GPS, cannot be seen with ease because of natural or synthetic features such as groups of tall buildings. Such maps are used with other information, such as the dynamics of the sensed velocity that had been seen before the loss of the signals, to reason about the location and likely activities being carried out by one or more people. Inferences can be made based on information about organizations and services associated with structures and locations proximal to the locations where signals were lost. Also, such reasoning can be used to turn off or to reduce the power consumed by the receivers of the location information, potentially with the joint use of accelerometers to identify when significant accelerations occur.
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Citations
20 Claims
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1. A system that facilitates shadow mapping, comprising:
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a processing component that processes location information received from a wireless receiving device; and
an analysis component that facilitates generation of a shadow map of a communications shadow based on the location information. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of generating a data store of shadow maps, the method comprising:
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receiving device data from a wireless communications device that is moved in relation to a GPS shadow;
analyzing the device data to determine features of the GPS shadow;
processing the features to generate a map of the GPS shadow; and
storing the map in a data store. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. A system that generates a data store of shadow maps, comprising:
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means for receiving device data from a plurality of wireless communications devices that indicates a presence or absence of GPS signals;
means for analyzing the presence or absence of the GPS signals to determine a location of a GPS shadow;
means for computing a dimension of the GPS shadow based on the presence or absence of the GPS signals;
means for generating a map of the GPS shadow in relation to a shadow-producing structure; and
means for storing the map in a data store.
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Specification