See the below link for getting data file:
link contains NOAA satellite ATP data. It’s FM modulated so you have to
design FM demodulator and store the result as .wav file. Once you got
.wav file, use wxtoImg software for decoding .wav file into images.
If you want to capture data file by urself, use Cross dipole or QHF
I wrote about NOAA satellite receiver system and also included many
links related to NOAA in my blog http://amritasenthil.wordpress.com/
Live in the moment,