Tracking wireless

Fuhr, Peter; Hedroug, Nacer
April 2008
InTech;Apr2008, Vol. 55 Issue 4, p52
The article provides information on asset tracking technologies associated with industrial real-time location service (RTLS). The general situation for a radio frequency identification (RFID)-based system is the database can inform the user about which reader last observed the tagged asset. The procedure used for global positioning system (GPS)-based tracking requires the receiver to pick up signals from four satellites measuring the time of signal arrival. Using the analogy of chirped-frequency radar, the system performance and range determination are easy to see. Numerous RTLS techniques are based on the strength of the signal received by the asset's attached radio changing and associating that strength variation with a change in the distance between the gateway and the receiver.


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