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Radio Frequency Identification Yang Gu What is RFID? RFID is a generic term It use radio waves to automatically identify objects. the most common method is to store a serial number on a microchip that is attached to an antenna . RFID System, Components Components T ransponder (tag)

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what is rfid
What is RFID?
  • RFID is a generic term
  • It use radio waves to automatically identify objects.
  • the most common method is to store a serial number on a microchip that is attached to an antenna.
  • Transponder (tag)
    • located on the object to be identified
    • consists of a coupling element and an electronic microchip.
    • Tags are available with storage capabilities from 512 bytes to 4MB.
  • Reader, contains
    • a high frequency module
    • a control unit and a coupling element to the transponder.
tag options
Tag options
  • Passive tags
    • draw power from the magnetic field generated between itself and a reader
  • Active tags:
    • larger and more expensive
    • self-powered by an internal battery
    • Can either provide active presence or active location information. 
    • Active location RFID systems support a higher effective read range with greater resolution capabilities
the read range for a typical rfid tag
The read range for a typical RFID tag
  • It depends on many factors
    • the frequency of operation,
    • the size and shape of the tag,
    • the power of the reader,
    • interference from metal objects or other RF devices.
  • In general,
    • low-frequency passive tags are read from a foot or less. High frequency passive tags are read from about three feet
    • UHF tags are read from 10 to 20 feet.
    • semi-passive and active tags use batteries to boost read ranges to 300 feet or more.
how much do rfid tags costs
How much do RFID tags costs?
  • 30 cents - $50 depending on the type of tag and the application.
  • Active tags – those with a battery – can cost far more.
  • And if you bundle in a sophisticated sensor, the cost can rise to more than $100.
next step rfid and intelligent agent
Next Step: RFID and Intelligent Agent
  • Most readers have additional interface (RS 232, RS 485, ...) to enable it to forward the data received to the segway robot.
  • Information provided by RFID systems can be used as vision for automate decision-making processes
is it suitable for segway
Is it suitable for Segway?
  • RFID
    • UHF/microwave tags
    • n/a
    • Using active tags for moving objects and passive or semi-passive tags for markers??
    • Can be as precise as within a few centimeters (RTLS)
    • cost??
  • Segway
    • read range ~24 feet
    • Update frequency 25Hz (current vision)
    • Not only object identification, but also a need to precisely locate objectsin real-time.
    • Distance precision
compare with vision
Compare with vision
  • Vision update rate = 25 frames/sec, RFID n/a (best known: update every few seconds) ??
  • Position precision: best known RFID can do much better than vision does. ??
  • RFID can locate both relative and global position for the tagged objects on the field without “looking” at them!
  • Easy setup for RFID, does not need color training or calibration.
  • RFID is more expensive than using multiple web-cameras but save much more effort in software implementation.
  • Update rate and distance precision
  • Cost for a tracking system
  • Interface (hardware/software)
  • Orientation
    • the reader cannot communicate effectively with a tag that is oriented perpendicular to the reader antenna.
  • If the update rate and position precision satisfy, RFID is definitely a better choice to do soccer game. RFID will let us focus more on strategy based on a precise world model.