Method and corresponding system for hand-held rf tag locator
First Claim
Patent Images
1. A method for locating at least one radio frequency (RF) tag, the method comprising the steps of:
- (a) providing a locating device having a means for identifying said at least one RF tag, (b) transmitting a directional transmit command signal to said at least one RF tag by using said locating device, wherein said locating device includes a directional antenna, (c) said at least one RF tag waiting to receive said transmit command signal, (d) upon receiving said transmit command signal, transmitting by said at least one RF tag, at least one response signal in synchronization with said transmit command signal, and (e) receiving said at least one response signal, by said locating device, measuring round trip delay and amplitude of said at least one received response signal.
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Abstract
A method and system for a hand-held RF tag locator (6) featuring the unique method of locating the position of one or more RF tags (4) by using a directional antenna (8) enabling azimuth determination and measuring the round trip delay enabling distance determination between the hand-held RF tag (6) locator to the RF tags (4).
67 Citations
22 Claims
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1. A method for locating at least one radio frequency (RF) tag, the method comprising the steps of:
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(a) providing a locating device having a means for identifying said at least one RF tag, (b) transmitting a directional transmit command signal to said at least one RF tag by using said locating device, wherein said locating device includes a directional antenna, (c) said at least one RF tag waiting to receive said transmit command signal, (d) upon receiving said transmit command signal, transmitting by said at least one RF tag, at least one response signal in synchronization with said transmit command signal, and (e) receiving said at least one response signal, by said locating device, measuring round trip delay and amplitude of said at least one received response signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A device for locating at least one RF tag, the device comprising:
(a) a directional antenna, (b) a reader, (c) a display controller, and (d) a display device, wherein said reader transmits a message to said at least one RF tag by using said directional antenna, and said at least one RF tag transmits an answer in synchronization with said reader, and said reader receives said answer from said at least one RF tag and measures a round trip delay and an amplitude of the received radio signal, and said reader forwards said measured round trip delay and said amplitude to said display controller controlling said display device. - View Dependent Claims (18, 19, 20, 21, 22)
Specification