[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.)
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