False alarm avoidance system
First Claim
1. A method carried out in a tag for a localisation system, the method comprising at said tag:
- operating a magnetic induction signal detection circuit to detect signals emitted by one or more beacons;
upon detection by said magnetic induction signal detection circuit of a magnetic induction signal comprising a first identification code;
correlating the magnetic induction signal comprising said first identification code to an ultrasound signal emitted by said one or more beacons, said ultrasound signal being suitable for obtaining room-level localisation accuracy and comprising a second identification code, received by said tag via an ultrasound signal detection circuit; and
if said correlation reveals an association between said first identification code and said second identification code;
transmitting a radio frequency announcement signal via a radio frequency signal transmitter circuit to signify said association.
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Accused Products
Abstract
The invention refers to a method of using a tag in a localisation system, the method comprising at said tag operating a magnetic induction signal detection circuit to detect signals, and upon detection of a magnetic induction signal comprising a first identification code: correlating the magnetic induction signal comprising said first identification code to an ultrasound signal comprising a second identification code, received via an ultrasound signal detection circuit. If said correlation reveals an association between said first identification code and said second identification code: a radio frequency announcement signal is transmitted via a radio frequency signal transmitter circuit to signify said association. The invention also refers to a method of using a beacon in said localisation system, as well as the localisation system comprising one or more tags and one or more beacons.
24 Citations
20 Claims
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1. A method carried out in a tag for a localisation system, the method comprising at said tag:
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operating a magnetic induction signal detection circuit to detect signals emitted by one or more beacons; upon detection by said magnetic induction signal detection circuit of a magnetic induction signal comprising a first identification code; correlating the magnetic induction signal comprising said first identification code to an ultrasound signal emitted by said one or more beacons, said ultrasound signal being suitable for obtaining room-level localisation accuracy and comprising a second identification code, received by said tag via an ultrasound signal detection circuit; and if said correlation reveals an association between said first identification code and said second identification code;
transmitting a radio frequency announcement signal via a radio frequency signal transmitter circuit to signify said association. - View Dependent Claims (2, 3, 4, 5, 6, 11, 12, 14, 15, 16, 17, 18, 19, 20)
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7. A method carried out in a beacon for a localisation system, the method comprising, at said beacon:
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operating a magnetic induction signal transmission circuit to transmit a magnetic induction signal comprising a first identification code; operating a radio frequency signal detection circuit; upon detection by said radio frequency signal detection circuit of a radio frequency announcement signal; evaluating whether said radio frequency announcement signal signifies an association between said first identification code and a second identification code of an ultrasound signal emitted by said beacon or a different beacon in the same room by use of an ultrasound signal transmission circuit, comprising said second identification code, and, conditionally upon evaluating said association;
asserting a localisation alert. - View Dependent Claims (8, 9, 10, 13)
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Specification