Method and system for locating wireless devices within a local region
First Claim
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1. A method, comprising:
- receiving Global Positioning System (GPS) data describing global locations for a plurality of wireless devices;
identifying a set of local wireless devices from the plurality of wireless devices, the set of local wireless devices being within a local region determined according to the GPS data;
transmitting, to each wireless device within the set of local wireless devices, a message to perform RFID range finding, wherein RFID range finding comprises;
selecting a plurality of wireless devices within the set of local wireless devices;
sending, by each wireless device within the selected plurality of wireless devices, an original signal to all other wireless devices within the set of local wireless devices;
receiving, by the respective wireless device within the selected plurality of wireless devices, a range finding measurement from each of the other wireless devices within the set of local wireless devices, wherein each range finding measurement is a backscattered modulated signal;
determining a respective relative location of each wireless device within the set of local wireless devices based on a plurality of range finding measurements; and
transmitting, to each wireless device within the set of local wireless devices, the respective relative location of each wireless device within the set of local wireless devices.
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Abstract
A method for locating wireless devices within a local region, comprising: determining respective global locations of two or more of the wireless devices; determining whether the wireless devices are within the local region by calculating respective distances between the global locations; determining respective ranges between the wireless devices within the local region; and, determining respective relative locations of the wireless devices within the local region by triangulation using the ranges.
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Citations
18 Claims
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1. A method, comprising:
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receiving Global Positioning System (GPS) data describing global locations for a plurality of wireless devices; identifying a set of local wireless devices from the plurality of wireless devices, the set of local wireless devices being within a local region determined according to the GPS data; transmitting, to each wireless device within the set of local wireless devices, a message to perform RFID range finding, wherein RFID range finding comprises; selecting a plurality of wireless devices within the set of local wireless devices; sending, by each wireless device within the selected plurality of wireless devices, an original signal to all other wireless devices within the set of local wireless devices; receiving, by the respective wireless device within the selected plurality of wireless devices, a range finding measurement from each of the other wireless devices within the set of local wireless devices, wherein each range finding measurement is a backscattered modulated signal; determining a respective relative location of each wireless device within the set of local wireless devices based on a plurality of range finding measurements; and transmitting, to each wireless device within the set of local wireless devices, the respective relative location of each wireless device within the set of local wireless devices. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system, comprising:
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a processor coupled to memory, a transmitter, and a receiver; and
,a non-transitory computer-readable medium storing instructions that are operative, when executed on the processor, to perform the functions of; receiving Global Position System (GPS) data describing global locations for a plurality of wireless devices; identifying a set of local wireless devices from the plurality of wireless devices, the set of local wireless devices being within a local region determined according to the GPS data; transmitting, to each wireless device within the set of local wireless devices, a message to perform RFID range finding, wherein RFID range finding comprises; selecting a plurality of wireless devices within the set of local wireless devices; sending, by each wireless device within the selected plurality of wireless devices, an original signal to all other wireless devices within the set of local wireless devices; receiving, by the respective wireless device within the selected plurality of wireless devices, a range finding measurement from each of the other wireless devices within the set of local wireless devices, wherein each range finding measurement is a backscattered modulated signal; determining a respective relative location of each wireless device within the set of local wireless devices based on a plurality of range finding measurements; and transmitting, to each wireless device within the set of local wireless devices, the respective relative location of each wireless device within the set of local wireless devices. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification