User's Guide

User Guide
12
User Guide, WhereTag IV GT, TFF-3110 D2280 Rev 02
© Copyright Zebra Technologies Corporation Confidential and Private
1.2 WhereTag IV GT Device
The WhereTag IV GT is a component of the Zebra Real Time Locating System (RTLS). It
can be attached to assets whose status must be quickly and accurately monitored.
Examples are the movement of a shipping container through a loading yard or a trailer
through a warehousing facility.
The WhereTag IV GT "blinks" a radio frequency (RF) transmission at a pre-programmed
rate ranging from 1 second to 5 days between blinks. The Zebra RTLS infrastructure
receives these blinks and use sophisticated Differential Time of Arrival, (DTOA), algorithms
to determine the location of the tag. Accuracy of this determined location can be as low as 2
meters and is nominally within 3 meters in most installations.
The WhereTag IV GT complies with the ISO 24730-2 RTLS standard. It operates in the
globally accepted 2.4GHz frequency band and transmits spread spectrum signals in
accordance with the standard. The use of direct sequence spread spectrum technology
provides extremely long range; in excess of 1,000 meter locate range outdoors, and 120
meter locate range indoors.
The WhereTag IV GT also incorporates an 802.11b/g transceiver for data communication
and/or positioning by standard or location-enabling 802.11 access points.
A magnetic receiver is also built into the WhereTag IV GT. The tag can receive low
frequency magnetic signals from an exciter called a WherePort. The WherePort
transmissions can be read at distances ranging from 1 to 8 meters.
The WhereTag IV GT also incorporates a GPS receiver module, which allows the tag to be
located outdoors, where a complete installation of Zebra RTLS system with 4 or more
WhereLANs is not required. The position fixes from GPS module can be transmitted via ISO
24730 RF link to WhereLAN’s. Due to long range of ISO 24730 RF link, large outdoor area
can be covered with a few WhereLAN units.