Magnus,
Drop the receiver and antenna out of the equation and
just provide a timing signal on launch pad...
I need to keep computers time synchronized from launch through at least
arrival on orbit so that time-tagged network messages can be played back
with some degree of fidelity. For this, I need the time source on the
rocket. Using a GPSDO in holdover mode seems like a good solution.
-Kevin
----- Original Message -----
From: "Magnus Danielson" <mag...@rubidium.dyndns.org>
To: <time-nuts@febo.com>
Sent: Tuesday, March 08, 2011 11:05 PM
Subject: Re: [time-nuts] Spacecraft Timekeeping
On 03/09/2011 06:08 AM, Kevin Watson wrote:
Hi All. Thanks for responding. There are quite a few GPS receivers that
will work outside of the usual commercial-grade GPS limitations, but I'm
not too sure I need such a receiver. As my application is to just
accuratly time-tag messages for a data recorder, my thinking is to allow
a ruggedized GPSDO to stabilize on the pad before launch, and then just
before launch force the GPSDO into holdover mode and act as the PTP
grandmaster for the onboard computers until we reach orbit. Once on
orbit I have other means to synchronize the PTP grandmaster.
Why carry the dead weight of something unusable in orbit.
Drop the receiver and antenna out of the equation and just provide a
timing signal on launch pad...
Cheers,
Magnus
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