Re: The Martian Chronicles

From: Rob Seaman <seaman_at_NOAO.EDU>
Date: Mon, 15 Jan 2007 09:02:57 -0700

I said:

> I also wonder whether it might be productive to consider closing
> the NTP "servo loop" in velocity (frequency) in this case, rather
> than position (phase).

Before somebody else calls me on it, I should point out that NTP
actually uses both:

        "The clock discipline algorithm functions as a nonlinear, hybrid
phase/frequency-lock (NHPFL) feedback loop."

(see http://www.cis.udel.edu/~mills/database/brief/clock)

I'm wondering whether the clock discipline might better emphasize
only frequency in such circumstances, as opposed to merely tempering
the PLL.

Rob
Received on Mon Jan 15 2007 - 08:03:19 PST

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