Patent ID: 8766777
Filing Date: 2014-07-01
Classification: G01S,G06K,H01Q,H04Q

Abstract:
1. A method of marking a plurality of non-RFID-active units in a space, the method comprising: providing the plurality of non-RFID-active units; affixing two RFID tags to each unit at respective, different tag locations on the unit, each tag including a respective directional antenna steered in a respective, different antenna direction, so that respective directional propagation patterns are defined; and disposing each unit within the space at a respective unit position; so that the propagation patterns of the tags for each unit intersect to define a respective per-unit reader location with respect to the respective unit position, and the tag locations, antenna directions, and unit positions are selected so that the respective per-unit reader locations for each unit disposed in the space at least partially overlap to define a reader location; activating an RFID reader having an antenna at the reader location to verify that both tags of each unit can be read.