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Can RFID Determine That a Tagged Object Has Stopped Moving?

Posted By RFID Journal, 09.18.2019

This would be within a small area, roughly 10 feet by 10 feet. Location is not as critical as speed and whether or not movement has ceased. Can RFID make this determination within less than a second?




It depends on what type of RFID system you are using. Passive UHF RFID is designed primarily to identify a tagged object and inform you that it is in the field of a certain reader antenna, thereby giving you its general location. It is not precise enough to tell you exactly when an item has stopped moving because there may be rebar in the floor, metal in the environment and other environmental factors that influence how long it takes a signal to travel from the tag to the reader.

An active ultra-wideband (UWB) RFID system overcomes this issue by using a battery-powered tag to emit signals at different frequencies. This provides very precise location data. If a UWB tag were set to ping every tenth of a second, it might provide the information you are looking to capture. UWB tags are larger and more expensive than passive tags, so whether or not this is a viable option might depend on the items' size and how many you need to track.

—Mark Roberti, Founder and Editor, RFID Journal


Nicolas Delorme 2019-09-20 01:22:55 PM
Adam, As an additional comment to Mark's, if you want to stick to passive UHF RFID and are more interested in motion than in position, there are some solutions out there that could cope with your need. For instance Asygn's UHF tag chip can read out accelerometers without batteries using standard readers and RAIN commands, with read ranges of a few meters. You can check out www.asygn.com or email contact@asygn.com if interested. Nicolas

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