[time-nuts] Need advice for multilateration setup

Robert Watzlavick rocket at watzlavick.com
Fri Apr 3 23:12:51 EDT 2015

I have an amateur radio license (mostly CW/HF and some VHF/UHF 
experience) and I've written some driver software for an IQ demodulation 
board but I have to admit, I would have no idea how to begin setting up 
that system as initially described by Attila and expanded by you and 
others.  I have a rudimentary understanding of the modulation schemes 
involved but I don't fully understand how the various codes mentioned 
fit in. I've poked around a bit at some articles on PN codes and I can 
see how data would be transmitted but I think I'm missing something key 
that allows you to extract positions, velocities, etc. out of the 
various links.  I think I have some more reading to do :)


On 04/03/2015 06:08 AM, Magnus Danielson wrote:
> I think this is a good idea, and it is relatively straight-forward to do.
> You can observe both code and carrier phase this way, given that the 
> transmitting radio is coherent with the code generation clock. Doppler 
> also pops out of the tracking station.
> A good coding-gain reduces the need for a strong transmitter.
> The issue might be the allowed width of the signal being transmitted, 
> forcing the chipping rate down.
> Cheers,
> Magnus

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