Hi,
On 11/18/2017 02:16 AM, Hal Murray wrote:
kb...@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?
You need to compensate for your position, because it would lower due to
longitude naturally.
Yeah, and then the moon isn't in perfect circular orbit either.
The sat is also in a not so perfect orbit, so it would also needed to be
measured and characterized.
Fun problem.
I realized that my on the fly least square algorithms would be nice to
adapt to this problem.
Cheers,
Magnus
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