On 4/18/13 12:15 PM, Peter Monta wrote:
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.
Of course, building an X-ray detector for XNAV is an unsolved problem, at least for spacecraft practical systems.
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