User's Manual

Model 2112 Modular Tag Manual
Page 7 of 16
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 2112 Modular Tag
The 2112 Modular Tag allows the implementation of a controlled and defined UWB transmitter onto a PWA,
provided the specifications in the PLUS documentation with regards to PWB layout, board material,
component sources and values, and assembly of the 2112 Tag circuitry are followed.
The 2112 Tag is a small transmit only device with an active transmit duty cycle of less than 0.0026%. The Tag
has one integrated antenna optimized for vertical applications. The data packets include a tag identification
code, status information, and time of arrival data. The FCC ID is ZEH0116.
As mentioned in the introduction, the data packet rate can be set at manufacture to 1Hz, 6Hz, 8Hz, 10Hz,
15Hz, or 20Hz. This is done by selection of the value of one part and is identified in a table in the schematic.
PLUS Documentation:
The controlling PLUS documentation for the 2112 Modular Tag is:
• 300-0268A, PWB, 2112 TAG Module
• 200-0275A PWA, 2112 TAG Module
The PWB document controls the layout of the 2112Tag printed circuit board, hence the antenna and
transmitter, and it defines the printed circuit board parameters including board material and thickness.
The PWA document defines the connections of the 2112 Tag board circuitry and the AVL for all the
components. The PWA also contains the block diagram for the 2112 Tag.