Hi Hal,


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


My impression is that it's easier to manage all-sky coverage at x-ray with
a small spacecraft package (I think millisecond pulsars generally emit at
both microwave and x-ray).  Also there's some interstellar scintillation at
microwave frequencies, which would hurt short-term timing performance
(something like the ionosphere's effect on terrestrial GNSS).

Cheers,
Peter
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