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Re: [Discuss-gnuradio] The PLL for the burst signal
From: |
Marcus Müller |
Subject: |
Re: [Discuss-gnuradio] The PLL for the burst signal |
Date: |
Sun, 23 Apr 2017 17:07:58 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.2.0 |
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.
>
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- [Discuss-gnuradio] The PLL for the burst signal, Vicfield Medici, 2017/04/23
- Re: [Discuss-gnuradio] The PLL for the burst signal,
Marcus Müller <=
- Re: [Discuss-gnuradio] The PLL for the burst signal, Vitt Benv, 2017/04/23
- Re: [Discuss-gnuradio] The PLL for the burst signal, Ron Economos, 2017/04/23
- Re: [Discuss-gnuradio] The PLL for the burst signal, Vicfield Medici, 2017/04/24
- Re: [Discuss-gnuradio] The PLL for the burst signal, Vitt Benv, 2017/04/24
- Re: [Discuss-gnuradio] The PLL for the burst signal, Vicfield Medici, 2017/04/25
- Re: [Discuss-gnuradio] The PLL for the burst signal, Jesse Reich, 2017/04/25