Is this something that could realistically be done? If so, how?
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Passive RFID systems can typically tell you that a tag is within an antenna's read field. There are a few passive real-time location systems that could tell you a tagged object was within a three-dimensional area. Usually with passive systems, the accuracy is to within 1 square meter (10.8 square feet). The only RFID system that could tell you where an object was located within a 3D space with a high degree of accuracy would be an ultra-wideband (UWB) system, which can typically indicate an object's location to within a few centimeters.
You could set up UWB tags to beacon once a minute, or several times a second or anything in between, and record the item's location at the time the signal was broadcast. UWB tags are fairly large, however, so if you were trying to locate something small or required greater accuracy than a few centimeters, an RFID system might not be the right tool for your particular job.
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