There are two different categories of RTL on the market
at present:
Active tag. This uses active RFID tags to broadcast
a signal, which is received by three reader antennae. The
time each signal is received is passed on to a software system
that uses triangulation to calculate the location of the asset.
WiFi tag. This has some drawbacks compared to conventional
RFID, in that it is less accurate (particularly when used
outside) and less secure, and can require users to beef up
the number of WiFi access points connected to their networks
by up to 20%.
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