Ulrich, That's what JPL tells me, but I don't think they intend the orbiters and rovers to cling to the nanosecond, even if the Proximity-1 protocol has some distinctly awesome timestamping capabilities. Best we could do in simulation with ephemeris data was 10 ms, but that was mainly due to Chebychev polinomial interpolation. More details in the Initerplanetary Internet project at www.eecis.udel.edu/~mills/status.html.
Dave Ulrich Windl wrote: > "David L. Mills" <[EMAIL PROTECTED]> writes: > > >>Evandro, >> >>We didn't account for gravity and time dilation, as the errors in the >>extrapolated ephemeris data dominated the error budget. I am told accurate >>spacecraft navigation needs time to the nanosecond. In principle, the > > > Wow! Spacecraft steering with nanosecond accuracy! Or did they talk about > longtime stability as in the past for long (sea) ship journeys? > > Just wondering, > Ulrich > > >>Proximity-I protocol and NTP onwire protocol can do that, I don't think the >>transceiver clocks and onboard rover clocks are anywhere near that caliber. _______________________________________________ questions mailing list [email protected] https://lists.ntp.org/mailman/listinfo/questions
