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

[Randy Warner]

Guys,

Another little problem with the spec is that the 25m number is REALLY
pessimistic. Typical 1 sigma performance is more in the 3-5m range for
both the N and T variants of just about any earlier M12/M12+. Also, as
Poul-Henning said, the Position Hold function really tightens up the
1PPS.  


Randy Warner
Senior Applications Engineer
Synergy Systems, LLC
randy at synergy-gps.com
________________________________________________________________________
______________________________________________________________
-----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 5:13 AM
To: bg at lysator.liu.se; Discussion of precise time and frequency
measurement
Subject: Re: [time-nuts] Positional accuracy of the M12+T

In message
<5197.202.64.189.90.1167829315.squirrel at webmail.lysator.liu.se>, bg@
lysator.liu.se writes:

>Hmmm... with 25m position accuracy (and 100ns is about 30m), how do 
>they really get time down to a few ns. Clever engineering!  :-)

Position hold mode allows them to solve N(sat) equations with one
unknown instead of N(sat) equations with four unknowns.

-- 
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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