The key point is that spacecraft can accurately know the distance to Earth with radio ranging but they don't know their position well perpendicular to the Earth-spacecraft line, so by using x-ray pulsars they could do better. Some other possibly more realistic ideas: how about using brighter radio pulsars or other spacecraft. Spacecraft often use other spacecraft to relay data back to Earth, the timing of the response should be sufficient to determine range if the other systematics could be ironed out.
arXiv:1011.5095 [pdf, ps, other]
Title: Timing X-ray Pulsars with Application to Spacecraft Navigation
Authors: Mike Georg Bernhardt, Tobias Prinz, Werner Becker, Ulrich Walter
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