RuntimeWarning: divide by zero encountered in divide

[wucke13]

This line yields the error. This was also mentioned in #31. I see the error every time when I launch the script. I'm using a PlutoSDR as source.

gr-adsb/python/demod.py

Line 101 in 5d0361d

self.bit_confidence = 10.0*np.log10(bit1_amps/bit0_amps)

[mhostetter]

Are you using real captured signals or synthetically-generated signals? This error occurs if the bit 0 positions have exactly 0.0000 amplitude, which is unlikely in real captured signals. An easy fix is to add a complex noise source (with very very small noise) to your signal.

But I agree, this error should be avoided.

[wucke13]

This is whenever I start gnuradio with a real SDR. Maybe the PlutoSDR sends a bunch of zeros before actually receiving in the brief moment after the configuration was pushed via libiio?

…

On Thu, Dec 8, 2022, 20:39 Matt Hostetter ***@***.***> wrote: Are you using real captured signals or synthetically-generated signals? This error occurs if the bit 0 positions have exactly 0.0000 amplitude, which is unlikely in real captured signals. An easy fix is to add a complex noise source (with very very small noise) to your signal. But I agree, this error should be avoided. — Reply to this email directly, view it on GitHub <#50 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AE3USFM6P4IDVIZ5X46OOMTWMI2QHANCNFSM6AAAAAASYON6AU> . You are receiving this because you authored the thread.Message ID: ***@***.***>

[thinkski]

I encountered same and fixed in #52.