[time-nuts] Fundamental limits on performance

[Mike S]

At 08:02 AM 9/13/2009, Magnus Danielson wrote...
>Mike S wrote:
>>Time synchronization between spacecraft might take advantage of 
>>pulsars, reducing the bandwidth used on inter-craft comm links. As 
>>frequency sources, they are as good as Rb short term, and as good as 
>>Cs long term. It should also be possible to use pulsars in a GPS-like 
>>way, for position and speed.
>
>I doubt it. Looks like another antenna and set of receiver 
>electronics.

http://tycho.usno.navy.mil/IAU31/sheikh.pdf
http://www.smad.com/analysis/ESA%20XNAV.pdf

There's lots more if you search around for "XNAV".