Hi Vicfield,
I actually work on the ground system that receives these signals. They are
distress signals from different beacons: EPIRBs (boats), ELTs (planes),
PLBs (hikers or anyone who wants a handheld device) that are captured or
relayed through satellites to the ground. This allows rescue auth
Hello, Victor:
Thanks for your information,
I exactly tried to decode the file with the real EPIRB signal from a PLB,
although I’m pretty suspicious about that is beyond me too much…
But it is really surprised me that what you said:
The signal "trigs" detecting is too complicated to implement a
H
i Vicfield!
another info for you: are you palying with a "real" EPIRB signal or with a
"test" signal?
In the first case be sure that the signal cannot reach the open space:
the signal "trigs" an expensive and complicated stuff, actulally it's
starts a S&R process with a lot of people involv
Hi,
Really thank you all.
I was read the specification of EPIRB and researched something about that,
but it’s seems some error about that. I will attach the GRC what I tried.
> 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
Current NTIA spectrum documents are here:
https://www.ntia.doc.gov/page/federal-government-spectrum-use-reports-225mhz-6ghz
Ron
On 04/23/2017 02:29 PM, Vitt Benv wrote:
Hello!
About frequencies pay attention that there are more than a single
(406.025 MHz) frequency.
In my direct experience th
Hello!
About frequencies pay attention that there are more than a single (406.025
MHz) frequency.
In my direct experience there's also 406.028 / 406.039 MHZ in use. So also
tuning has to be on the right frequency.
Take a look also at
https://www.ntia.doc.gov/files/ntia/publications/compendium/0406
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
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
