Daniel, This has been covered previously on time-nuts, a look through the archives would probably answer your question to a large extent. I do not remember the time frame though, probably a year or more ago.
Sometimes, googling around that kind of search term does return time-nuts postings :) Didier ------------------------ Sent from my BlackBerry Wireless thingy while I do other things... -----Original Message----- From: Daniel Davson <ddav...@peralex.com> Sender: time-nuts-boun...@febo.com Date: Tue, 29 Jun 2010 10:13:28 To: <time-nuts@febo.com> Reply-To: Discussion of precise time and frequency measurement <time-nuts@febo.com> Subject: [time-nuts] Motion effects on accuracy of GPS pps Hi, I've recently completed a GPSDO using the pps output of a uBlox Antaris TIM4 GPS module to discipline a 10MHz OCXO. I'm now investigating the motion effects (acceleration/uniform velocity) on the accuracy of the time-pulse and hence on my frequency output. I've been unable to find any detailed information on the relationship between the accuracy of the pps output and the effects of having the receiver in motion (i.e. in a car/boat, at velocities far below the modules operating limit of 515m/s) - I'd appreciate some input on this matter. Does motion cause increased jitter? Is it possible for it to cause a phase error in the pps output for a finite duration? I suspect that the averaging I am doing on my phase measurements will eliminate the effects (600 samples, 1 second apart), but if the error introduced is significant I'll most likely add monitoring of the DOP information and disable the GPSDO when the TDOP is too high. The product's system integration manual does indicate that is possible to use an accuracy mask, which theoretically imposes a limit on the accuracy of the output, however this information is quite vague - emailing uBlox support has yet to yield a response. Best Regards, Daniel Davson Disclaimer: http://www.peralex.com/disclaimer.html _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.