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Essentials of Positioning and Location Technology by David Bartlett

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6 Other techniques and hybrid systems

6.1 RFID and RTLS

6.1.1 RFID

RFID (Radio Frequency IDentification) systems are systems in which the identity of a tag is read by a reader or interrogator. This is accomplished when the tag is in the vicinity of the reader’s antenna. The reader transmits a radio signal which is picked up by the tag which responds by sending back its identity. Tags may be passive (no battery) or active (containing a battery) and typically range in size from millimetres to centimetres. Passive tags and smaller form-factor tags generally have short reading ranges (centimetres), but active tags may have much longer reading ranges (metres up to several tens of metres). Tags can also be writable allowing the system via the reader to ...

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