Had to google that; for the others: http://www.epirb.com/
Emergency Position Indicating Radio Beacon ; 406 MHz, bursty, wikipedia says: > The digital distress message generated by the beacon varies according to the above factors and is encoded in 30 hexadecimal characters. The unique 15-character digital identity (the 15-hex ID) is hard-coded in the firmware of the beacon. The 406.025 MHz carrier signal is modulated plus or minus 1.1 radians with the data encoded using Manchester encoding, which ensures a net zero phase shift aiding Doppler location So, a PSK that can only take values of +1.1 and -1.1, relative to the "idle" carrier. Bit rate is 400b/s, so that makes it a 800 S/s PSK symbol rate (manchester-encoding happening in between). Cheers, Marcus [1] http://www.cospas-sarsat.int/images/stories/SystemDocs/Current/cs_t.001_oct_2013.pdf On 04/23/2017 04:48 PM, Vicfield Medici wrote: > Hi, > > When trying to decode the signal, I always use the PLL Carrier Tracking to > solve the error > about phase shifting, and it’s always doing a good job. > > But I start trying to decode the EPIRB signal, I just got a sample with only > one burst, > and PLL seems not work anymore even I tuned the parameter in many ways. > > Does the PLL Carrier Tracking can’t handle the discontinuous signal somehow? > Or it’s my misunderstanding? > > I really want to know how to take that, thanks for any help. > > Regards, > > Vicfield > > > > > -- > View this message in context: > http://gnuradio.4.n7.nabble.com/The-PLL-for-the-burst-signal-tp63604.html > Sent from the GnuRadio mailing list archive at Nabble.com. > > _______________________________________________ > 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