I have some large spectrum records and I would like to use GR for analysis in a a sort of "off-line" mode. I want to visualize the data using the spectrogram and then identify subsets of interesting features (e.g. WiFi Packets in 2.4 GHz) by frequency and time coordinates. Essentially, I want to know what index in the file certain features correspond with so I can save them as separate files. To this end, I've found gr_spectrogram_plot very handy, but it doesn't quite do what I want because the y-axis which displays time isn't showing up correctly. My y-axis is always 0.0, and the cursor highlight also reads 0.0 (although the frequency is correct). However, the qt spectrogram appears to have correct time information when I make a simple file source -> qt spectrogram sink.
I'd like to fix this issue so I've been pouring over the code in gr-qtgui. I don't have much experience with QWT or Python GUIs in general. From what I can tell, there are methods for frequency axis and intensity scaling, but not time. Is this true or am I missing something in the API? The historyExtent parameter in the WaterfallData constructor appears to get hardcoded to 200 in WaterfallDisplayPlot.cc (gr-qtgui/lib). It would also be nice to toggle between the time and sample number. I'm happy to do the work to implement this. Could someone point me in the right direction here? Thanks! PWG _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
