On Sun, Jan 26, 2014 at 11:48 PM, Cheng Chi <ch000...@e.ntu.edu.sg> wrote:
> Hi, > > I am using gr-air-modes for decoding the air plane signal with USRP. I've > successfully used the "modes_rx" and "modes_gui" for decoding the mode-S > packets. > > However, it seems that the modes_rx or modes_gui can't provide the > timestamp of the mode-S packets being decoded. Is there any option that I > can set to timestamp the mode-S packet? The reason I want this timestamp > function is that I want to know the decoded packet data correspond to which > part of the raw data (complex baseband data samples). > If you're using a USRP, you should be getting a timestamp. It's the second number printed, as in the following: (-14 *1.29258827811*) Type 0 (short A-A surveillance) from ab2984 at 3000ft If you are using a GPSDO with your USRP, the printed time will be in UTC seconds. Otherwise, it will be in seconds since the application started running. --n > > Thank you for any help you can provide in this situation. > > I found that there's a file called "air_modes_preamble.cc" seems to > provide the timestamp function. Does anyone know how to use this file > separately? > > Best regards, > Cheng Chi > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > >
_______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
