SYSTEM AND METHOD FOR POSITIONING ACTIVE RFID TAG
First Claim
1. A system adapted to position a target object equipped with an active RFID (Radio Frequency Identification) tag by a plurality of RFID readers, the system comprising:
- a receiving module receiving a RF (Radio Frequency) signal of the active RFID tag received from each of the RFID readers respectively, and a corresponding signal intensity of each of the RF signals being calculated;
a comparison module comparing the corresponding signal intensities of the RF signals to calculate an approaching vector corresponding to the location of the RFID reader with the greatest signal intensity of the RF signal;
a setting module defining a geometric center of the locations of the RFID readers as a first coordinate for a positioned location of the target object, and approaching the positioned location from the first coordinate to a second coordinate according to the approaching vector when the location of the RFID reader with the greatest signal intensity is determined, and then resetting the first coordinate as the location of the second coordinate after finish approaching; and
an output module outputting the location of the first coordinate reset by the setting module as the positioned location of the target object;
wherein the comparison module, the setting module and the output module continuously operates to output the latest positioned location of the target object when the receiving module continuously receives the RF signals.
1 Assignment
0 Petitions
Accused Products
Abstract
A positioning system and method are provided to use multiple RFID readers to position a target object with an active RFID tag equipped thereon. The system and method defines a geometric center of the locations of the RFID readers as a first coordinate. When the RFID readers continuously receive RF signals of the active RFID tag, a corresponding signal intensity of each of the RF signals is calculated and compared to obtain an approaching vector corresponding to the location of the RFID reader with the greatest signal intensity of the RF signal. A positioned location of the target object is then approached from the first coordinate to a second coordinate according to the approaching vector. The first coordinate and the positioned location of the target object will be reset as the second coordinate. The reset first coordinate is output as the latest positioned location of the target object.
22 Citations
20 Claims
-
1. A system adapted to position a target object equipped with an active RFID (Radio Frequency Identification) tag by a plurality of RFID readers, the system comprising:
-
a receiving module receiving a RF (Radio Frequency) signal of the active RFID tag received from each of the RFID readers respectively, and a corresponding signal intensity of each of the RF signals being calculated; a comparison module comparing the corresponding signal intensities of the RF signals to calculate an approaching vector corresponding to the location of the RFID reader with the greatest signal intensity of the RF signal; a setting module defining a geometric center of the locations of the RFID readers as a first coordinate for a positioned location of the target object, and approaching the positioned location from the first coordinate to a second coordinate according to the approaching vector when the location of the RFID reader with the greatest signal intensity is determined, and then resetting the first coordinate as the location of the second coordinate after finish approaching; and an output module outputting the location of the first coordinate reset by the setting module as the positioned location of the target object; wherein the comparison module, the setting module and the output module continuously operates to output the latest positioned location of the target object when the receiving module continuously receives the RF signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A method adapted to use a plurality of RFID (Radio Frequency Identification) readers to position a target object with an active RFID tag equipped thereon, the method comprising the steps of:
-
defining a geometric center of the locations of the RFID readers as a first coordinate for a positioned location of the object; repeating the following steps when the RFID readers continuously receive RF (Radio Frequency) signals of the active RFID tag; receiving the RF signals of the active RFID tag through the RFID readers to calculate a corresponding signal intensity of each of the RF signals; comparing corresponding signal intensity of each of the RF signals; calculating an approaching vector corresponding to the location of the RFID reader with the greatest signal intensity of the RF signal; approaching the positioned location of the target object from the first coordinate to a second coordinate according to the approaching vector; resetting the first coordinate as the location of the second coordinate; and outputting the reset first coordinate as the latest positioned location of the target object. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
-
-
17. A system to use a plurality of RFID (Radio Frequency Identification) readers to position a target object with an active RFID tag equipped thereon, the positioning system comprising:
-
a receiving module receiving a RF (Radio Frequency) signal of the active RFID tag received from each of the RFID readers respectively; a selection module randomly selecting two-by-two of the RFID readers to match a plurality of comparison pairs; a comparison module comparing the RF signals of the RFID readers within the comparison pairs, and determining the RFID reader with the greater signal intensity within each of the comparison pairs; a positioning module positioning an effective range of each of the RFID reader with the greater signal intensity within each of the comparison pairs to calculate an overlapped range of the effective ranges; and an output module outputting the overlapped range as a positioned location of the target object. - View Dependent Claims (18, 19, 20)
-
Specification