Two Antennas (was RE: "Blunkett u-turn on data privacy plans")

[Ian G Batten]

On Tue, 04 Mar 2003, Owen Lewis wrote:
> between the antennas. I missed the start of this thread but 100 microns
> seems a significant distance in comparison to the wavelength of light and
> therefore should pose no great problem in the accuracy of calculation from a
> detected phase shift. However, if the wavelength of one's chosen radiation
> is, say, 1500 metres then detecting a phase shift with sufficient accuracy
> to make 100 micron measurements possible may be implausible. Or do I
> misunderstand?

Quite.  The discussion is with regard to GPS L1, at about 20cm
wavelength.

ian