Location system for asset or personnel tracking using multi-frequency ultrasonic transducers and goertzel filters
First Claim
1. A location system, for the tracking of personnel or products for establishing the location of an identification tag attached to a person or product, the location system comprising a tag, wherein the tag comprises:
- (i) a power source;
(ii) an ultrasonic transducer;
(iii) a transmitter is connected to an output from said transducer and operable to transmit multiple frequencies to establish the unique ID of said tag in question, the location system further comprising;
(iv) a plurality of strategically located ultrasonic receivers; and
(v) processing means including a reader operable to process output signals from said ultrasonic receivers to establish the ID of said read tag and its location, wherein the transmitter is operable to transmit a first frequency solely to identify when said tag is about to start transmitting data, and wherein the reader incorporates a number of Goertzel filters corresponding to the number of frequencies transmitted to process the output signals from the ultrasonic receivers.
2 Assignments
0 Petitions
Accused Products
Abstract
A location system, for the tracking of personnel or products for establishing the location of an identification tag attached to a person or product, has the tag comprising a power source; an ultrasonic transducer; a transmitter connected to an output signal from the transducer and capable of transmitting multiple frequencies to establish the unique ID of the tag in question, including a first frequency solely to identify when a tag is about to start transmitting data; the system comprising further a plurality of strategically located ultrasonic receiver; and processing means including a reader incorporating a number of Goertzel filters corresponding to the number of frequencies transmitted to process output signals from the ultrasonic receivers to establish the ID of the read tag and its location.
14 Citations
10 Claims
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1. A location system, for the tracking of personnel or products for establishing the location of an identification tag attached to a person or product, the location system comprising a tag, wherein the tag comprises:
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(i) a power source; (ii) an ultrasonic transducer; (iii) a transmitter is connected to an output from said transducer and operable to transmit multiple frequencies to establish the unique ID of said tag in question, the location system further comprising; (iv) a plurality of strategically located ultrasonic receivers; and (v) processing means including a reader operable to process output signals from said ultrasonic receivers to establish the ID of said read tag and its location, wherein the transmitter is operable to transmit a first frequency solely to identify when said tag is about to start transmitting data, and wherein the reader incorporates a number of Goertzel filters corresponding to the number of frequencies transmitted to process the output signals from the ultrasonic receivers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification