[time-nuts] Disciplining Rubidium

SAIDJACK at aol.com SAIDJACK at aol.com
Thu Apr 24 02:16:39 EDT 2008

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.
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.


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