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 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.
Dave Evandro Menezes wrote: > On May 4, 2:37 pm, "David L. Mills" <[EMAIL PROTECTED]> wrote: > >>On symmetry, etc. There are both gravitational and velocity corrections >>relative to both Earth and solar system barycentric time amounting to >>some 15 ms, but current space missions don't worry much about that. The >>mission times are relative to a clock onboard the spacecraft; nothing >>else matters. Our Earth-Mars simulations didn't worry about these >>effects either. I suspect disciplining an orbiter/rover clock to these >>corrections will be dominated by the frequency noise of affordable >>oscillators. Maybe not. > > > Just curious, but did you have to deal with relativistic effects of > relative time dilation as the craft speed increased? > > TIA _______________________________________________ questions mailing list [email protected] https://lists.ntp.org/mailman/listinfo/questions
