[Discuss-gnuradio] PPM radio control signal demod

[Peter Jensen]

I'm interested in demodulating the simple PPM signal commonly used for
RC aircraft control in the 72 MHz band. While searching, I came across
a post to this list back in 2005 where Chuck Swiger linked to a page 
that looked interesting, but the page isn't up and archive.org doesn't
go that deep.

Does anyone have a copy of that page, or have any ideas for other
references that might be useful? I've included a few notes that I've
accumulated below.

Thanks!
Peter

http://en.wikipedia.org/wiki/Pulse-position_modulation

Lab notes with some details about PPM modulation/demodulation: 
http://www.eng.auburn.edu/~troppel/courses/TIMS-manuals-r5/TIMS%20Experiment%20Manuals/Student_Text/Vol-D2/D2-11.pdf

Has good MATLAB PPM generation code:
https://www.ee.oulu.fi/research/ouspg/RFID%20Audit%20Toolkit

Paper on PPM demodulation techniques aimed at the optical world, but
mentions trivial approaches:
http://users.ece.utexas.edu/~bnosratmakouei/index_files/papers/PPMdemodulation.pdf


Old message: 
http://lists.gnu.org/archive/html/discuss-gnuradio/2005-05/msg00066.html
> From:    cswiger
> Subject:     [Discuss-gnuradio] radio control transmitter signal
> Date:    Wed, 4 May 2005 16:37:09 -0400 (EDT)
> Gang - Here's a little bit on receiving a model aircraft R/C
> transmitter signal. Get a great demod PPM output - the challenge
> would be to write a signal processing block to output each channel
> position. Switching to PCM might be easier to work with tho.
> 
> http://webpages.charter.net/cswiger/rc_nbfm.html
> 
> --Chuck