On 06/23/2013 12:04 AM, Jim Lux wrote:
I think that doing the PN code and correlator is something that could be
done with tubes (especially if you didn't want to go P-code).
I suppose you could use a counter to record the changes in code phase as
you scan for the correlation peak, so that gets you your numeric code
phase.
Getting doppler as a number for computation might be tricky, but you
could probably solve for the position and clock offset without using
doppler.
Decoding the nav message at 50bps should be straight forward.
All that is relatively trivial... compared to
Hmm. what about implementing the nav calculation as an analog computer.
ANalog multipliers were built using vacuum tubes.
You will need more ummpf to do the trigonometry. If you go
electromechanical you can do it, but it will be rough estimation
regardless. CORDIC was made for these circumstances, to let a weak
processing mechanism do navigation processing for airplanes. You could
do CORDIC in tubes or relays. Bunch of transistors and diodes could make
minor wonders in compactness.
Cheers,
Magnus
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