Utilization of motion and spatial identification in mobile RFID interrogator
First Claim
1. A system comprising,a mobile RFID system which moves with at least one load tag in a load;
- anda fixed RFID system that reads field tags in a field of the fixed RFID system;
wherein the mobile RFID system determines the at least one load tag is in the load by comparing motion parameters of scanned tags read by the mobile RFID system and motion parameters of the field tags read by the fixed RFID system.
1 Assignment
0 Petitions
Accused Products
Abstract
An RFID system is used to detect whether an RFID tag is part of the load of a forklift or other transport device. In one aspect where the load is in motion relative to an RFID reader system, the RFID system obtains tag readings and derives tag vector motion information which can be compared to the known motion of the load to distinguish tags that are part of the load from false positives which are unavoidably also within the field of the reader system. A forklift antenna system may also make readings from load pickup to load deposit in a truck trailer, and utilize computed tag vector motion information to distinguish tags that are part of the load from false positives. The tag vector information my relate to tag velocity, tag acceleration, and/or rate of change of tag acceleration. The two components of the RFID system may communicate information on identified tags, and/or interact (e.g. by silencing tags), so as to cooperate in identifying true positive tags in the load. A portal or reader system location along the path of the forklift can be activated prior to arrival of the load to eliminate certain false positives from requiring evaluation while the forklift load is moving through the field region of such reader system. Vertical motion of the load can be utilized as a way of discriminating between true positive tags in the load and false positives.
-
Citations
20 Claims
-
1. A system comprising,
a mobile RFID system which moves with at least one load tag in a load; - and
a fixed RFID system that reads field tags in a field of the fixed RFID system; wherein the mobile RFID system determines the at least one load tag is in the load by comparing motion parameters of scanned tags read by the mobile RFID system and motion parameters of the field tags read by the fixed RFID system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- and
-
11. A RFID system, comprising:
-
a reader system that reads field tags in a field of the reader system; and a decision system providing a decision as to whether the read field tags represent a load tag indicating the load tag is on a load of a moving vehicle or an extraneous tag indicating the extraneous tag is not on the load of the moving vehicle based at least in part on information derived from comparison of movements of the read field tags and movements of the load tags. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
-
-
19. A method of distinguishing a radio frequency identification (“
- RFID”
) tag within a load of a vehicle from an extraneous tag, said method comprising;moving the load of the vehicle through a field of a RFID reader system, wherein the load comprises items that each have load RFID tags; obtaining, from an RFID system of the vehicle, a load motion parameter which is a function of the movement of the load; reading, using the RFID reader system, field tags within the field of the RFID reader system during movement of the load through the field of the RFID reader system; and comparing load motion information for the load based on the load motion parameter with tag motion information derived from the tag readings. - View Dependent Claims (20)
- RFID”
Specification