[time-nuts] Disciplining Rubidium
SAIDJACK at aol.com
SAIDJACK at aol.com
Fri Apr 25 00:33:01 UTC 2008
Hi guys,
let me play the bad cop here:
1) Since it is easy and inexpensive to get OCXO's that have stabilities of
parts to the E-012 or even E-013 (10811 on Ebay for $50 for example) over
time periods of 1/10s out to hundreds or even thousands of seconds
2) Since even the best Carrier Phase system won't give you much more than
1ns or so accuracy (from the previous threads) per second, and maybe parts to
the E-013 over 100s or so - which is worse, or just as good as our venerable
OCXO for short time frames.
3) Since the standard GPS stability seems to overlap our OCXO stability
just about at the right point to achieve overall E-012 to E-013 performance at
about 500 - 2000s intervalls on typical GPSDO's
Then why would we need a carrier phase driven GPSDO? What would it give us
in performance that we cannot achieve today with say a good (surveyed antenna)
M12M driving an excellent OCXO?
The only advantage I could maybe see is that the carrier phase GPSDO would
bring us down to E-014 a bit faster than the M12M could?
bye,
Said
In a message dated 4/24/2008 14:53:46 Pacific Daylight Time,
bruce.griffiths at xtra.co.nz writes:
Tom
Yes, however you have to do all the required corrections for ionospheric
phase delay etc in real time in an external processor.
These particular receivers have been used in real time arrays to monitor
earth deformations of volcanic fields.
Bruce
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