[time-nuts] Spacecraft Timekeeping

Kevin Watson time-nuts at enuuf.com
Wed Mar 9 18:58:03 UTC 2011


Hi Magnus,

As I said in an earlier message, this is an experiment that I want to run 
and would rather not touch mission and safety-critical GNC components, like 
our navigation GPS receivers. Mass is not an issue.

-Kevin

----- Original Message ----- 
From: "Magnus Danielson" <magnus at rubidium.dyndns.org>
To: <time-nuts at febo.com>
Sent: Wednesday, March 09, 2011 10:25 AM
Subject: Re: [time-nuts] Spacecraft Timekeeping


> Kevin,
>
> On 03/09/2011 06:39 PM, Kevin Watson wrote:
>> 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.
>
> If you only need to synchronise on launch pad, then you can separate off 
> the OCXO and training logic (TIC, CPU and DAC) from the GPS receiver and 
> antenna. Then you run in hold-over mode using the pieces you need. You 
> then use the same core for whatever other method you use.
>
> If you use a space-capable GPS receiver, then just hook in.
>
> Cheers,
> Magnus
>
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