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 <pat...@poes-weather.com> > 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 > > > > _______________________________________________ > > 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 > > _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
