[time-nuts] Disciplining Rubidium
SAIDJACK at aol.com
SAIDJACK at aol.com
Thu Apr 24 06:16:39 UTC 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.
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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