System and method for location tracking using wireless networks
First Claim
1. A method for estimating a location of one of a plurality of wireless devices that transmit a plurality of data packets within a wireless tracking system comprising:
- providing a plurality of location sensors comprising a plurality of antenna elements;
receiving the plurality of data packets using the plurality of antenna elements, each data packet in accordance with an 802.xx compatible data transmission protocol for use in wireless data communication, where each of the plurality of antenna elements receives the plurality of data packets with a different delay time therebetween;
determining an angle of arrival at each location sensor from the plurality of location sensors in dependence upon the different delay time between the received data packets to form a plurality of angles of arrival;
measuring at each of the plurality of antenna elements an intensity of the received plurality of data packets to form a plurality of intensities;
providing the plurality of angles of arrival and the plurality of intensities to a wireless tracking system server; and
, estimating a location of the wireless device within the wireless tracking system in dependence upon the plurality of angles of arrival and the plurality of intensities from each of the plurality of location sensors using the wireless tracking system server.
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Abstract
A novel wireless tracking system is disclosed for determining a location of an 802.xx compatible mobile tag or other 802.xx compatible wireless device located within the wireless tracking system. The mobile tag or wireless device communicates with the wireless tracking system using data packets in accordance with predetermined wireless protocols. A plurality of location sensors receive the data packets and provide angle of arrival and intensity information to a wireless tracking system server which performs statistical processing on this information and determines the location of the mobile tag or other wireless device within the wireless tracking system.
120 Citations
36 Claims
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1. A method for estimating a location of one of a plurality of wireless devices that transmit a plurality of data packets within a wireless tracking system comprising:
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providing a plurality of location sensors comprising a plurality of antenna elements;
receiving the plurality of data packets using the plurality of antenna elements, each data packet in accordance with an 802.xx compatible data transmission protocol for use in wireless data communication, where each of the plurality of antenna elements receives the plurality of data packets with a different delay time therebetween;
determining an angle of arrival at each location sensor from the plurality of location sensors in dependence upon the different delay time between the received data packets to form a plurality of angles of arrival;
measuring at each of the plurality of antenna elements an intensity of the received plurality of data packets to form a plurality of intensities;
providing the plurality of angles of arrival and the plurality of intensities to a wireless tracking system server; and
,estimating a location of the wireless device within the wireless tracking system in dependence upon the plurality of angles of arrival and the plurality of intensities from each of the plurality of location sensors using the wireless tracking system server. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for estimating a location of one of a plurality of wireless devices that transmit a plurality of data packets within a wireless tracking system comprising:
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providing a plurality of location sensors comprising a plurality of antenna elements;
receiving the plurality of data packets using the plurality of antenna elements, each data packet in accordance with a data transmission protocol for use in wireless data communication, where each of the plurality of antenna elements receives the plurality of data packets with a different delay time therebetween;
determining an angle of arrival at each location sensor from the plurality of location sensors in dependence upon the different delay time between the received data packets to form a plurality of angles of arrival;
measuring at each of the plurality of antenna elements an intensity of the received plurality of data packets to form a plurality of intensities;
providing the plurality of angles of arrival and the plurality of intensities to a wireless tracking system server; and
,estimating a location of the wireless device within the wireless tracking system in dependence upon the plurality of angles of arrival and the plurality of intensities from each of the plurality of location sensors using the wireless tracking system server. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A system for using a wireless network wireless communication protocols comprising:
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a plurality of mobile tags for communicating with the wireless tracking system using data transmission signals and for receiving data from the wireless network in accordance with 802.xx compatible communication protocols;
a plurality of location sensors spatially disposed from one another, each location sensor comprising a plurality of antenna elements for passively receiving the data transmission signals transmitted from the mobile tag and in accordance with a known data transmission protocol for wireless data communication and a processor for determining a time difference of arrival between the plurality of antenna elements and for in dependence upon the determined time difference of arrival calculating an angle of arrival of said data transmission signals from the mobile tag and for determining an intensity of said data transmission signals; and
,a central processing system for receiving the angle of arrival and the intensity of said data transmission signals for each of the plurality of location sensors and for performing statistical calculations to estimate a physical location of the mobile tag in relation to the plurality of location sensors. - View Dependent Claims (27, 28, 29)
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30. A receiver for use with a wireless tracking system comprising:
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a plurality of antenna elements for receiving 802.xx compatible wireless data communication signals according to a predetermined protocol;
a processor for identifying a data packet within a signal and based on protocol data therein, for determining an angle of arrival of the data packet based on differences in signal received at each of the plurality of antenna elements and for determining an intensity of the signal including the data packet; and
,a transmitter for transmitting the angle of arrival and the determined intensity of the signal to a wireless tracking system.
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31. A mobile tag comprising:
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an accelerometer for sensing a movement of the mobile tag; and
,a wireless transmitter for transmitting data relating to an identification of the mobile tag to a location sensor in accordance with wireless communication protocols upon the piezo sensor sensing movement of the mobile tag. - View Dependent Claims (32, 33, 34, 35, 36)
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Specification