Location and tracking of people with combined use of RF infrastructure and dead reckoning modules
First Claim
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1. A system for tracking persons and other assets in a structure, comprising:
- a multi-function tracking tag comprising an RF beacon for transmitting an RF beacon signal and a dead reckoning module, said RF beacon signal including data from said dead reckoning module;
a plurality of RF transceivers of known location forming a wireless array for receiving said RF beacon signal from said multi-function tracking tag and thereafter re-transmitting said RF beacon signal; and
a computer associated with said plurality of RF transceivers, said computer being programmed to determine a location of said multi-function tracking tag using an algorithm wherein said algorithm utilizes signal strength of said RF beacon signal and said data from said dead reckoning module to calculate said location of said multi-function tracking tag wherein said algorithm minimizes a squared error between a position estimate based on said signal strength of said RF beacon signal and a position estimate based on said data from said dead reckoning module.
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Abstract
A system for tracking persons and other assets in a structure, having a multi-function tracking tag and a network of fixed RF receivers forming a gateway array. The location of the person being tracked is calculated by a computer using an algorithm that weights each separate signal according to the probability of its accuracy, thus using data with the least error. A preferred algorithm is shown in FIG. 2.
37 Citations
18 Claims
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1. A system for tracking persons and other assets in a structure, comprising:
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a multi-function tracking tag comprising an RF beacon for transmitting an RF beacon signal and a dead reckoning module, said RF beacon signal including data from said dead reckoning module; a plurality of RF transceivers of known location forming a wireless array for receiving said RF beacon signal from said multi-function tracking tag and thereafter re-transmitting said RF beacon signal; and a computer associated with said plurality of RF transceivers, said computer being programmed to determine a location of said multi-function tracking tag using an algorithm wherein said algorithm utilizes signal strength of said RF beacon signal and said data from said dead reckoning module to calculate said location of said multi-function tracking tag wherein said algorithm minimizes a squared error between a position estimate based on said signal strength of said RF beacon signal and a position estimate based on said data from said dead reckoning module. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method comprising the steps of:
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transmitting an RF beacon signal from a multi-function tracking tag comprising an RF beacon and a dead reckoning module, said RF beacon signal including estimated position data from said dead reckoning module; receiving said RF beacon signal at a plurality of RF transceivers of known location within a structure forming a wireless array; and determining a location of said multi-function tracking tag using an algorithm programmed on a computer associated with said plurality of RF transceivers, wherein said algorithm utilizes signal strength of said RF beacon signal and said estimated position data from said dead reckoning module to calculate said location of said multi-function tracking tag wherein said algorithm minimizes a squared error between a position estimate based on said signal strength of said RF beacon and a position estimate based on said estimated position data from said dead reckoning module. - View Dependent Claims (10, 11, 12, 13)
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14. A system comprising:
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a multi-function tracking tag comprising an RF beacon for transmitting an RF beacon signal and a dead reckoning module, wherein said RF beacon signal includes estimated position data from said dead reckoning module; a plurality of RF transceivers forming a wireless array within a structure to receive said RF beacon signal; and a computer associated with said plurality of RF transceivers, said computer being programmed to determine a location of said multi-function tracking tag using an algorithm wherein said algorithm utilizes signal strength of said RF beacon signal and said estimated position data from said dead reckoning module to calculate said location of said multi-function tracking tag by minimizing a squared error between a position estimate based on said signal strength of said RF beacon and a position estimate based on said position data from said dead reckoning module to thereby implement a system for tracking persons and other assets in a structure. - View Dependent Claims (15, 16, 17, 18)
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Specification