[EMAIL PROTECTED] wrote: > One more comment: > > the GPS disciplining doesn't affect performance of parts to the 14th short > term. GPS is used for long-term (>1000s or so) error correction, where it > can > achieve parts the 14th, but only after a day or much longer. > > GPS is not good enough to give you more than parts to the 8th-9th timing > accuracy per second, which is already accuracy in the feet range. Parts to > the > 14th short term would require accuracy in the 0.00001 foot range, not > possible. > > bye, > Said > > Said
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 _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
