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Re: [Discuss-gnuradio] RFID receiver

From: Erlend Barstad Strand
Subject: Re: [Discuss-gnuradio] RFID receiver
Date: Tue, 24 Oct 2006 09:49:41 +0200
User-agent: Internet Messaging Program (IMP) 3.2.8

Sitat Harald Welte <address@hidden>:

> On Tue, Sep 19, 2006 at 11:55:51AM +0200, Erlend Barstad Strand
> wrote:
> > Hello
> >
> > As a pre-project to my master-project I am considering making a
> > receiver with gnuradio, atleast attempt to. However I recently
> noticed
> > that an RFID detector/receiver is mentioned as a project under
> > investigation or progress in the "Exploring GNU Radio"-document.
> Sorry for the late reply, but I didn't have a lot of time for keeping
> up
> with mailinglists recently (busy with other free hardware RFID work
> for
> http://openpcd.org).

No problem...
> When you talk about RFID, what kind of system are you talking about?
> Which frequency? Which protocols?  Magnetic coupling, backscatter or
> SAW?
I have changed the focus of my pre-project sligthly, so I will not try
to make an RFID receiver this semester, I might try next though.

If I do try this next semester, it will be a RFID receiver of the ISO
14443-2 standard. The aim of the project will simply be to sniff on the
communication between a card an a reader. The reason for chosing ISO
14443-2 is simply that I have a RFID reader available using this

> I have quite a bit of experience with RFID on a protocol level.  My
> hardware related experience is limited to 125kHz and 13.56MHZ
> magnetic
> coupling systems at this point.
> I personally would love to see an ISO 18000-6 (UHF RFID)
> implementation
> for gnuradio.  The biggest challenge is the analog frontend because
> of
> the 80dB difference between Tx and Rx.  you will probably need two
> antennas, and switch off / attenuate the Rx path while transmitting.
> If you have any questions, just ping me.
> Cheers!
> --
> - Harald Welte <address@hidden>
> http://gnumonks.org/
> We all know Linux is great...it does infinite loops in 5 seconds. --
> Linus

Erlend Barstad Strand

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