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Chapter 3: Uses of RFID Technology > Global Positioning Systems and RFID

Global Positioning Systems and RFID

GPS and RFID are sometimes used in combination in order to provide more complete material tracking capability. RFID has a typical maximum read distance of about 100 m. GPS does not typically work indoors or in an environment with tall structures, such as might exist in a large city or a storage yard, which block the system’s line of sight access to satellites. Tall structures sometimes reflect satellite signals, resulting in an incorrect position being reported.

Systems such as the Savi GlobalTag (ST-694) contain an active RFID tag, a satellite modem, and a GPS receiver.

The GlobalTag includes a Satellite Modem for communications anywhere RFID readers are not available. When RFID infrastructure is not present, the GlobalTag automatically uploads data to RFID networks via satellite. GlobalTag provides GPS location coordinates with every satellite transmission. Unlike other satellite tags, GlobalTag has active RFID functionality, so battery power is not expended on satellite communications when the tag is within range of an active (RFID) reader.64


  

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