Over what distance range? At what carrier frequency?
Phase difference measurement can get you there as can various forms of
interferometry if the signal is CW.

Look at how geodetic GPS can get down to mm with relatively cheap silicon.

Does the result have to be supplied in real time?

The CORRECT way to access the list's knowledge is to pose
the full problem so that our replies fit your constraints.

Robert

Marcel van Lieshout wrote:
> 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?
>
> Marcel
>
> Jinx wrote:
> >> Hmm, not fast enough. Looking for something in the low picoseconds
> >> switching times :-0
> >
> > ECL 100K is probably the fastest readily-available family, and 25GHz
> > (40ps) operation is the exception rather than the norm
> >
> > Googling around, it appears anything over that is very specialised, not
> > what you'd call a "family". Logic at up to 350GHz (2.8ps) appears to be
> > possible but in the experimental domain
> >
> > <pulling teeth question time> ;-)
> >
> > Do you actually need ps speed, or is there a way that what you're trying
> > do can be done by inference ? For example, in the way that high speed
> > oscilloscopes sample to build a waveform ? Can you improve what you
> > have or can get with liquid nitrogen for example ?
> >
> > </pulling teeth question time>
>
>

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