Can you detect how far away an RFID tag is?

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Say you are moving towards an RFID tag with a reciever. Can you detect exactly how far away you are?

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Comments on Can you detect how far away an RFID tag is? Leave a Comment

March 4, 2010

oapg2 @ 9:52 pm #

No
At least you will need two receivers and need to know the relative position between the two receivers.
That is a radio-goniometric principle on how to get the position, (or distance) from a radio or magnetic source.

The first problem is that power of the RFID tag could vary, and you cannot predict exactly the distance because this power variation.
With two receivers you can compare the amount of power ’sense’ in each receiver and since you know the distance between such receivers you could calculate the distance and position of RFID tag

billrussell42 @ 9:52 pm #

With the right receiver, yes. But I don’t think anyone has built this feature into a receiver.

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