[time-nuts] Next Generation Time/Frequency Standards May Require Provisions Preventing Vertical Displacement

[Jeffrey Okamitsu]

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
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________________________________
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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