[time-nuts] Next Generation Time/Frequency Standards May Require Provisions Preventing Vertical Displacement
Jeffrey Okamitsu
w3kl at w3kl.com
Wed Sep 29 17:59:26 UTC 2010
I was thinking more in terms of remotely located devices. That is, not at
the same physical position where the sync signal is transmitted over some
reliable medium. In that case, one will have to know the relative vertical
displacement.
Also, as I think further, in principle the local terrain at each location plays
a role as well.
Jeff
Jeffrey K. Okamitsu, PhD, MBA
+1-609-638-5402 US Mobile Phone
+1-240-421-0692 GSM Mobile Phone
________________________________
From: Magnus Danielson <magnus at rubidium.dyndns.org>
To: time-nuts at febo.com
Sent: Wed, September 29, 2010 1:51:30 PM
Subject: Re: [time-nuts] Next Generation Time/Frequency Standards May Require
Provisions Preventing Vertical Displacement
On 09/29/2010 06:56 PM, Jeffrey Okamitsu wrote:
> Actually, as I think about this, it will be impossible to "calibrate" another
> device unless one knows the vertical displacement between the standard and the
> DUT AND a suitably adequate (read: easy to use) algorithm for accounting for
>the
> effect of gravity can be developed.
You can compare two standards by levelling their gravitational centers (similar
to phase centers of GPS antennas) to the same level or within same level to what
degree they are comparable too.
Wither they need to be within 1 mm, 100 mm, 10 m or 1 km depends on the quality
of the oscillators.
Cheers,
Magnus
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