At 11:36 PM 3/25/2004 +0100, you wrote:
>Perhaps, I don't know.
>
>I'm trying to measures RF time-of-flight up to a few mm accuracy ( 10mm
>would be fine, 1 mm would be
>fantastic). Well, because I have no influence on the transmitter, I
>actually want to measure
>Time-Differences-Of-Arrival at several receivers.
>
>What do you (or anybody else) think?

You're talking 10-30ps. This (and better) is do-able using delay techniques,
but it's pretty fancy design. I know an expert in the Bay area (USA West
Coast) if this work is *well* funded. I think one technique involves
fast analog current ramps plus digital delay, using oscillators with
very low phase noise.

I've seen very fast (and relatively low power) ASICS for this purpose,
but the resolution is more like 100mm than 10mm, IIRC.  Don't ask me
where, either (I don't recall).

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
speff@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com

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