Deap Space Navigation

Does anyone know how we navigate our deep space probes? I know we use radar
and GPS in LEO. What do we use for deep space? My guess is we use Doppler
shift a lot -- but that is just a guess.

My understanding is the navigation system of the probe that had the unit
conversion error was "telling" us that there was a problem, but we didn't
have enough confidence in the navigation system to realize there was a
catastrophic error in the trajectory.

Danny Dot
www.mobbinggonemad.org