User's Manual

6 PLUS Tag User’s Manual DRAFT
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1. Introduction
The 1104 Personnel Name Tag is a small, active RFID tag that works as part of a PLUS Real Time Location
System. The tag consists of a circuit board with integrated antenna, coin cell battery, and plastic enclosure.
The tag is designed to support attachment of a CR80 format ID badge. The tag is worn on a lanyard or clip to
enable location information for personnel.
2. Overview
Background
The 1104 Tag periodically transmits a short (~100 us) packet that is received by a network of PLUS Readers.
The Readers generate time of arrival data for the tag, and then send this data across an Ethernet network to a
server running the PLUS Location Software. The PLUS software uses the time of arrival from multiple
readers to determine an accurate location for the tag.
1104 Tag
Each packet transmitted by the 1104 tag consists of pulses transmitted at a 1 MHz pulse repetition frequency
(PRF). Data is transmitted using On-Off Keying (OOK) modulation, in which a pulse present in a given
timeslot = data value 1, and a missing pulse in the timeslot = data value 0.
The OOK modulation of the 1 MHz pulse train results in a 1 MHz data rate.
Each pulse has an RF center frequency of 6.6 GHz. The pulse is generated from a logic gate edge, filtered by
a passive RLC network, and amplified by a transistor drive circuit coupled to the integrated antenna.