Re: [Discuss-gnuradio] GOES LRIT???

[Patrik Tast]

Hi Rydel,

Right, you will first get CCSDS frames (bpsk-demodulated) let us call
that file lrit-frames.dat. To create images from the frames
(lrit-frames.dat) we need to unpack the data (lrit-frames.dat) using the
RICE algorithm to a new file say goes-13-lrit-frames.lrit. Since the
data rate is low we could rice-decode the frames (10 frames/earth disk)
on the fly, of course. 

The (NASA) RICE algorithm seems to be fairly easy BUT I haven't bothered
to try since the result (full-disk) ain't that valuable for weather.
You'll get nice images of Tellus, that's 4 sure.

The RICE lib from NOAA is found here
http://www.noaasis.noaa.gov/LRIT/software.html It doesn't link (on
linus), we've asked if they could release source-code so we could make
it cross-platform (last year)....

We will support you if you want to have a go. We have antennas standing
by at LA (Los Alamitos)

Patrik


On Fri, 2013-10-25 at 08:26 -0400, Raydel Abreu (CM2ESP) wrote:
> Patrick,
> 
> 
> Thanks for the link!!! I have visited your repository before, but I
> failed to dig deeper, that's why I didn't found the GOES I believed it
> was only for HRPT, that's a great opportunity, I will try to build it.
> 
> 
> Quick question, you mention I need to do RICE for obtaining images, so
> if I understand correct your application produces the frame files, a
> (dot)lrit file if I am correct? If that's the case I can use your
> program for the receiving chain, dump the lrit files into a shared
> folder and then processing the images with compatibles windows
> programs I am familiar too. Am I correct?
> 
> 
> Thanks!
> 
> 
> Raydel
> 
> 
> 
> 2013/10/25 Patrik Tast <address@hidden>
>         Hi,
>         
>         
>         See
>         https://github.com/mbsat/gr-poes-weather/tree/master/apps/GOES/gui
>         You need to upgrade the code to work with latest GR (to use
>         cmake and
>         stuff)
>         
>         To decode frames into images you need to use the RICE
>         algorithm.
>         
>         Patrik
>         
>         On Thu, 2013-10-24 at 10:55 -0400, Raydel Abreu (CM2ESP)
>         wrote:
>         > Hello,
>         >
>         >
>         > Is there any GOES LRIT decoder available under Linux and GNU
>         Radio
>         > with support for USRP or RTL-SDR. In case there is only USRP
>         > compatibility, perhaps with the GRC file freely available it
>         can be
>         > attempted to be converted for RTL-SDR?
>         >
>         >
>         > I have found some tools but only for POES HRPT...
>         >
>         >
>         >
>         > Thanks,
>         >
>         >
>         > Raydel
>         >
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