Low budget space vehicle tracking

Ian Stirling wrote:
In principle, it could be very accurate, but you end up either wanting to
include a hyper-accurate clock, or put a GPS on it to get the time.
And once you've got a GPS on it, this would probably be your
secondary means of position determining.

Backup or redundancy is good. Give a easy way for sanity checks.

But seriously, how accurate does it need to be? We got to the moon without
GPS.

Greg