[time-nuts] OT: Far-out space navigation from sideways satnav signals

Hal Murray hmurray at megapathdsl.net
Thu Apr 18 16:38:50 EDT 2013


pmonta at gmail.com said:
> I wonder if there's any advantage in combining far-away GPS with X-ray
> pulsar navigation (XNAV), which is said to be good to a few kilometers,
> though long integration times are needed.  For example, the rough system
> time from XNAV could enable very long (arbitrarily long?) coherent
> integration for very faint GPS signals obtained with a gain antenna pointed
> at the Earth. 

Why are X-Ray pulsars better than radio pulsars for navigation?

What's the adev of pulsars at long times?  How long is long?  Where is the 
knee of the curve?

How good a clock could you build with a pulsar-DO?  (Assume you have a good crystal but no atomic clocks.)   Would you have to watch multiple pulsars at the same time?  (Multiple antennas.)

-- 
These are my opinions.  I hate spam.





More information about the time-nuts mailing list