I'm looking to show the long-term phase stability (or actually perturbations) of a very-stable MSK-modulated signal. I currently have the 200-baud signal running through a 300Hz-wide filter, and then (among other things) run through a complex-to-arg conversion to extract the instantaneous phase angle. I then split positive and negative values and average them separately.
I'm nearly 1000km from the transmitter, so the results are somewhat noisy, but by looking at the complex-to-arg output, you can clearly see that "bits" are being encoded. My goal isn't to demodulate the signal, but rather to use it as a stable phase reference, for measuring ionospheric disturbances, which can impart phase hits to the received signal (actually, given that the ionosphere isn't exactly a stable reflector/refractor, there will always be a certain amount of small phase disturbances). Is my approach even close to reasonable? -- Marcus Leech Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
