[time-nuts] Fundamental limits on performance

WB6BNQ wb6bnq at cox.net
Sun Sep 13 05:14:26 UTC 2009


It seems to me the GPS system is the best example to draw from.  Assuming these space craft are too far from Earth to be corrected against Earth's reference, I would guess your intent is to have them sync'ed with each other ?


"Lux, Jim (337C)" wrote:

> In the deep space exploration biz, we've been talking about time and frequency transfer between spacecraft. It's pretty easy to figure out what the "Shannon limit" for the link between the spacecraft is (given power transmitted, antenna gain, etc... And with coding, we get within tenths, if not hundredths of a dB of the limit)...
> So, if I have a clock of some performance on Spacecraft A, is there a "simple" way to say how well I can do transfering that to Spacecraft B?
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