ianyappy
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Hi, I'm quite new to the field of communications and I've been recording satellite data for demodulation for kicks. The system I'm looking at, Orbcomm, modulates data in the form of SDPSK, or basically some form of differential PSK. However, there is some software that takes in a NFM demodulated version of the data. The link below shows someone using SDR to pump NFM demodulated audio to the software which then demodulates the digital data.
https://www.youtube.com/watch?v=bZ6Exd9X7hM
I've been puzzling over how this demodulation works. My understanding is that PM modulated data can be recovered from the FM demodulated data by integration, but mathematically, this seems to be correct only to some scaling factor. How does one then recover the PSK data given this?
https://www.youtube.com/watch?v=bZ6Exd9X7hM
I've been puzzling over how this demodulation works. My understanding is that PM modulated data can be recovered from the FM demodulated data by integration, but mathematically, this seems to be correct only to some scaling factor. How does one then recover the PSK data given this?