User's Manual

320-0298 Model 2106 Tag User Manual
Page 7 of 9
Overview
Background
Tag tracking is accomplished by analyzing time-differences-of-arrival (TDOAs) of tag transmissions. When a tag
transmits a packet, PLUS ® Sensors that successfully receive the packet will send out information concerning
the tag packet, including a precise timestamp. The difference in the timestamp between sensors gives the
TDOA for that sensor pair/tag combination. At least three sensors must hear a tag in order to determine a
valid position for that tag.
Model 2106 Tag
Within the PLUS ® Real Time Location System, the 2106 Tag is used to track the position of people or objects.
The tag is attached to an item, and through transmitted RF packets, sends its unique device ID and status. As
the system sensors hear the tag, the tag position is determined and the position is added to its internal
database. Note that the tracking system automatically discovers new tags and adds those newly discovered
tags to that database.