|
From: | Vitt Benv |
Subject: | Re: [Discuss-gnuradio] The PLL for the burst signal |
Date: | Sun, 23 Apr 2017 23:29:11 +0200 |
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
> address@hidden
> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
_______________________________________________
Discuss-gnuradio mailing list
address@hidden
https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Prev in Thread] | Current Thread | [Next in Thread] |