If all independent clocks is stable enough, then correlation between of
them could be re-considered after the data will be collected, I think.
On 2016-04-11 01:00, Bruce Griffiths wrote:
There is a proposal to use multiple light bucket style optical
telescopes to do Intensity stellar Interferometry over short baselines
(up to perhaps 1km or so) by using independent clocks to time tag
photon arrivals. store the time tags and process the data off line.
Depending on the time tag resolution there is a need to measure the
time differences between the independent clocks to an accuracy in the
1ns to 100ps range. Is there a better way of doing this other than
using geodetic grade GPS receivers capable of GPS carrier phase
measurements?Since the local clock flywheel oscillators will need to
not deviate by more than 100ps or so over the several minutes required
to perform the carrier phase averaging what sort of clock will be
suitable apart from a good rubidium standard with a cleanup
oscillator?
NB Running fibres or coax between the telescopes isnt an option.
The relative positions of the telescopes has to be known to within a
cm or so for this to work.
Bruce
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--
WBW,
V.P.
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