PHK, You're right, they will move a little as the satellites move, but this 1PPS shift is really pretty minor compared to the fixed offset unless you have horrible visibility. And for all practical purposes the diurnal effects pretty well drown out any shifts unless your Position Hold coordinates are REALLY off.
Remember, in the work I do I don't worry too much about single digit nanoseconds, so I tend to gloss over little stuff like that. However, if my 1PPS is flying back and forth +/-100ns or so, THEN I get interested...... Randy ________________________________________________________________________ __________________________________________________________ -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Poul-Henning Kamp Sent: Wednesday, January 03, 2007 11:26 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Positional accuracy of the M12+T In message <[EMAIL PROTECTED]>, " Randy Warner" writes: >You will see several >ns of 1PPS offset due to slight changes in the Position Hold Position, >but this is easily removed using the 1PPS offset commands if you are >trying to match to another receiver. Are you sure these offsets are constant ? My impression is that they depend on the satellite geometry ? -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 [EMAIL PROTECTED] | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
