On 12/08/14 12:41, jmfriedt wrote:
I am completing a summary of this summer's experiments including * decoding weather satellite and the opportunity to introduce channelized decoding (Frequency Xlating FIR Filter)
I guess you mean the NOAA POES Fleet, transmitting APT on around 137MHz ? Or are you up on 1691 MHz ? I am also experimenting with decoding NOAA WX satellites at the moment. Flowgraph (some of which borrowed from the afore-mentioned OZ9AEC) and some raw and processed pictures are at http://hal.g7iii.net/POES/ Filenames have the format: SC_RAW_DDMMHHmm.jpg - Raw Files received off air. RF Front-end is gnuradio SC_MCIR_DDMMHHmm.jpg - MCIR Fake Colour Images SC_NOIR_DDMMHHmm.jpg - Infrared Colour enhancement Images (Shows strong rain storms rather well sometimes) Where SC will be NOAA15, NOAA18, NOAA19 as appropriate, and DDMMHHmm is the time/date of the pass, UTC. I also have a modified flowgraph that resamples to 11025kHz, and sends that to an alsa loopback device, to which wxtoimg is connected on the other end. That's actually how most of the pictures are created. While the output from gnuradio is fine (although I have not done a back-to-back comparison yet), If you feed wxtoimg a raw image from Alex's/Mine flowgraph, it can't tell when the pass was, or which spacecraft, so can't work out where to draw the map. Most annoying that it doesn't let you *tell* it where the s/c was :) Next pass I downlink, I'll remember to keep the poes.dat output file, and run that back to back test... Antenna system is a double turnstile at ~12 ft, no preamp, Funcube Dongle Pro Plus, fed into Gnuradio. I must try the USRP and compare! For those interested, some of the images are of the remnants of Hurricane Bertha, after she had passed my location. Height of the Antenna for those was only 7 ft, due to expected high winds (Antenna is only mounted temporarily on a carbon fibre fishing pole!) Iain _______________________________________________ Discuss-gnuradio mailing list [email protected] https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
