[time-nuts] Oops - wrong URL for tvb plot!

Magnus Danielson cfmd at bredband.net
Tue Apr 10 13:09:51 EDT 2007


From: "Tom Van Baak" <tvb at LeapSecond.com>
Subject: Re: [time-nuts] Oops - wrong URL for tvb plot!
Date: Tue, 10 Apr 2007 09:27:08 -0700
Message-ID: <000301c77b8d$16299ea0$c1ac1cac at pc52>

> >> Did you drift-rate compensate the measures before ADEV/MDEV them?
> >> That's another real world effect one may need to handle. For GPS receivers
> >> against a good reference (H/CS) it may not be such a big issue thought. It
> >> should be interesting to pull the drift rate values out and plot them alongside
> >> to see when they take over.
> 
> I don't normally remove phase drift (frequency offset)
> as this drops out of any adev calculation.

I was talking about frequency drift rate, it is usually shorted into drift
rate. This is not canceled at all by either ADEV or MDEV. Frequency offsets
cancel naturally.

> > Infact, if you send me the raw data I could process them and see what pops up.
> > I have some code lying around already. Should get into the habit of doing some
> > cheesy plots (gnuplot maybe).
> > 
> > Cheers,
> > Magnus
> >
> 
> The raw data is there too: http://www.leapsecond.com/pages/3gps/

Great! Thanks!

Cheers,
Magnus




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