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VLBI guys usually have a local H1 maser clock, they go through a complex synchronization ritual prior to the start of observations. H1 masers have short-term stability on the order of 1e-16.
GPS synchronization would be a *starting point* for such things.
On 2016-04-01 08:42, madengr wrote:
What would it take to get phase coherency, say at 1 GHz, on a global scale;
short of running cables? I assume with a moderate priced GPSDO one can get
10E-12 stability, so that would be 0.01 Hz frequency stability at 1 GHz.
Does that mean you can integrate for 10 seconds and stay within 0.1 radian
phase drift?
Lou
Marcus D. Leech wrote
Since those stations would likely not be phase-coherent, then any spectra adding would only improve sensitivity by sqrt(N)--you don't get to effectively use the sum of the effective apertures of the individual stations.
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