[time-nuts] Positional accuracy of the M12+T

[Randy Warner]

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 
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-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] 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
<D6D8D27B5219D649A005529978F791371CCE0B at SBSERVER.Synergy-GPS.sbs>, "
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
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by
incompetence.

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