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Albert Goodwill posted on March 14, 2007, 4:26 am
Hi Everyone,
In these days, many vehicles are installed with RFID tags (E-Tags) for
highway/freeway tool collections.
The tool collection RFID readers are able to read the tags from a
distance about 4-6meters. These readers can be focused to a particular
lane, so that vehicles on the next lane will not be read (ie. readers
can have narrow sensing beam)
Is there such thing as "low-cost" (for amateurs/hobbyists) long range
(4-10meters), small (so that an indoor mobile robot can carry) RFID
readers?
I want to investigate if we can use them for localization (assuming
that RFID reader can have narrow reading/writing beam) of the mobile
robot in indoor environments.
If you have RFID experience (particularly for localization) in
robotics would you share your experience with us?
Regards,
Albert
In these days, many vehicles are installed with RFID tags (E-Tags) for
highway/freeway tool collections.
The tool collection RFID readers are able to read the tags from a
distance about 4-6meters. These readers can be focused to a particular
lane, so that vehicles on the next lane will not be read (ie. readers
can have narrow sensing beam)
Is there such thing as "low-cost" (for amateurs/hobbyists) long range
(4-10meters), small (so that an indoor mobile robot can carry) RFID
readers?
I want to investigate if we can use them for localization (assuming
that RFID reader can have narrow reading/writing beam) of the mobile
robot in indoor environments.
If you have RFID experience (particularly for localization) in
robotics would you share your experience with us?
Regards,
Albert
Joe posted on
Re: Long distance readable( and writable) RFID reader+tags for robot localization
robot localization as well. But, in my case, indoor, read only
ability is all I want.
Joe Dunfee
H. E. Taylor posted on
Re: Long distance readable( and writable) RFID reader+tags for robot localization
This article may be relevant for you:
2006/05/08: How to Build a Low-Cost, Extended-Range RFID Skimmer by Ilan
Kirschenbaum, Avishai Wool
<http://www.eng.tau.ac.il/~yash/kw-usenix06/index.html>
<regards>
-het
--
"Progress in software has not followed Moore's law." -John Holland
How's yer crap detector? http://www.autobahn.mb.ca/~het/detector.html
H.E. Taylor http://www.autobahn.mb.ca/~het/
John Nagle posted on
Re: Long distance readable( and writable) RFID reader+tags for robot localization
If you're willing to place beacons, do time-of-flight,
not beam angle.
John Nagle
Re: Long distance readable( and writable) RFID reader+tags for robot localization
Can you elaborate a bit more ?
What types of beacons and how to measure time-of-flight in low-cost
fashion?
Is there such units as off the shelf product?
Albert,
Re: Long distance readable( and writable) RFID reader+tags for robot localization
Doing time-of-flight with electromagnetic waves is not a trivial
thing. Light travels too fast to make it easy or cheap to measure
time-of-flight.... well, at least it has been. II just Googled "Laser
Distance" and found a product by Stanley tools, which does it and
costs only $100!
http://www.stanleytools.com/default.asp?TYPE=PRODUCT&CATEGORY=LASER+MEASURING&PARTNUMBERw-910
However, none of their instruments have an interface.
Are you suggesting Time-of-flight can be used with RFID chips? Does
the RFID chip respond with enough timing reliability to work with this
concept?
Joe Dunfee
Frnak McKenney posted on
Re: Long distance readable( and writable) RFID reader+tags for robot localization
A third, but somewhat more complex, approach is to measure signal
strength. Of course, you need to have control over the transmitter
output power and be able to measure the strength of the received
signal, and it's far from precise, but in some cases (e.g. "locating"
a wireless router within a building) it may be "good enough".
Frank McKenney, McKenney Associates
Richmond, Virginia / (804) 320-4887
Munged E-mail: frank uscore mckenney ayut minds pring dawt cahm (y'all)
--
Do not follow where the path may lead. Go instead where there is
no path and leave a trail. -- Ralph Waldo Emerson
--
Re: Long distance readable( and writable) RFID reader+tags for robot localization
Counting at a few gigahertz just isn't a big deal any more.
And if the other end is an active device, not a passive one, it's
even easier. See
http://www.rfid-radar.com/
And that works with really dumb tags.
It ought to be possible to do this with WiFi technology. It
might take some additional timing hardware to time exactly
when packets go in and out, down to a nanosecond or so, but
it should work.
John Nagle
Re: Long distance readable( and writable) RFID reader+tags for robot localization
I looked at their web site, and they have a lot of white papers and
general information about the technology for those interested. I wrote
them and inquired about its viability for a robot hobbiest. He didn't
give me a price, but said it is too expensive for this sort of use.
Joe Dunfee
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