[time-nuts] Disciplining Rubidium

[SAIDJACK at aol.com]

Hi Bruce,
 
either way GPS can't give you parts to the 14 short term as was  claimed. 
Also there are not many affordable carrier phase GPS receivers out  there as far 
as I know.
 
Also, 2 parts to the 11 over 1s - 100s is still not as good as a good OCXO  
(parts to 12 or even 13 possible), so carrier phase performance from 1-100s  
with parts to the 11 would not help the GPSDO perform better steady state short  
term 1s to 100s.
 
bye,
Said
 
 
In a message dated 4/23/2008 17:59:00 Pacific Daylight Time,  
bruce.griffiths at xtra.co.nz writes:

Only  true if you dont use carrier phase measurements to discipline the  OCXO.
When carrier phase discipling is used then a short term (1 - 100sec)  
phase error measurement noise of around 2E-11/Tau is possible.
However  the accuracy at 1 day is limited to around 1E-14 by the SV local  
oscillator instability and other phase delay  instabilities.

Bruce





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