5 ms·

> That's IF you are two inches away, and the object is NOT moving. If the tag is at the edge of the tire (as the picture implies) - where are you going to put t

> That's IF you are two inches away, and the object is NOT moving. If the tag is at the edge of the tire (as the picture implies) - where are you going to put the reader so that it can get within 2 inches of the tire? 900Mhz RFID tags can be read from over 30ft away. Can't find a video but someone @ defcon was able to get a read from 250ft away using a yagi antenna & power way over the FCC limits.

grymoire1 11y ago
Yes, but there's a big difference between a one-time demo under ideal conditions, and something that can be mass-produced and used daily. In the case of tires, (1) the car is likely moving, (2) the tires are spinning at the same time, (3) there are 4 tires (at least - not to mention shoes, credit cards, etc.) and all RFID tags of the same frequency will respond to the reader at the same time, making it very difficult to capture the ID of a single tag. There is no collision avoidance in the transmission. Yes, I'm sure some special technology can be developed that can track and follow a single car as it travels down a road, and isolate the tags, but the police already use ANPR to identify amber alerts, stolen vehicles, unpaid fines, etc. ANPR systems cost under $200, and some (according to Wikipedia) will work even if the car is traveling at 120 MPH. It makes no sense to attempt to use RFID for tracking cars.
- cobookman 11y ago
  > and all RFID tags of the same frequency will respond to the reader at the same time Depends on the tag design. Using Q Values you can avoid the collisions to some extend. http://www.rfidsb.com/anticipating-your-starting-point-with-the-q-value/ http://www.rfidsb.com/anticipating-your-starting-point-with-... Not sure how much the spinning tires distort signals...etc. Def out of my scope of knowledge. > It makes no sense to attempt to use RFID for tracking cars. Agreed, grabbing license plates makes more sense.
deleted 11y ago
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grymoire1 11y ago

Yes, but there's a big difference between a one-time demo under ideal conditions, and something that can be mass-produced and used daily. In the case of tires, (1) the car is likely moving, (2) the tires are spinning at the same time, (3) there are 4 tires (at least - not to mention shoes, credit cards, etc.) and all RFID tags of the same frequency will respond to the reader at the same time, making it very difficult to capture the ID of a single tag. There is no collision avoidance in the transmission. Yes, I'm sure some special technology can be developed that can track and follow a single car as it travels down a road, and isolate the tags, but the police already use ANPR to identify amber alerts, stolen vehicles, unpaid fines, etc. ANPR systems cost under $200, and some (according to Wikipedia) will work even if the car is traveling at 120 MPH. It makes no sense to attempt to use RFID for tracking cars.

cobookman 11y ago
> and all RFID tags of the same frequency will respond to the reader at the same time Depends on the tag design. Using Q Values you can avoid the collisions to some extend. http://www.rfidsb.com/anticipating-your-starting-point-with-the-q-value/ http://www.rfidsb.com/anticipating-your-starting-point-with-... Not sure how much the spinning tires distort signals...etc. Def out of my scope of knowledge. > It makes no sense to attempt to use RFID for tracking cars. Agreed, grabbing license plates makes more sense.

deleted 11y ago

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