[time-nuts] Time and frequency practical exercise 2018 late quarter; precision measure of 432mhz band Sat in Lunar Orbit
hmurray at megapathdsl.net
Fri Nov 17 20:16:08 EST 2017
kb8tq at n1k.org said:
> Ok, 1 Hz at 437.5 MHZ is roughly 2 ppb. That is pretty much “slam dunk”
> accuracy with a GPSDO. Much easier to obtain and set up in a school
> environment. The key will be orbit estimation for the +/- doppler part of
> it. Orbit estimation is not quite a slam dunk sort of thing. The GPSDO
> would also give accurate location. Even with good orbit data, the solution
> still requires a good location estimate.
What is the orbital period? It would be fun to plot the Doppler over time
and see if you can get something that looks like a big chunk of an orbit.
Ugh. What is the Doppler due to the Earth's rotation?
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