It will clear when Goddard updates the satelite. Later, I’ve been told by that this is a common error that used to happen with WEFAX on HF. There was no reason to try to make the false color composite images with this result since it requires both channels. Unfortunately, the thermal infrared imaging on the satellite appears to be broken, so all I got was the near infrared channel: This reception was amazing almost from AOS till LOS despite the trees and building buildings below 5 deg elevation. This was the first pass I tried to receive and it was quite all right but not perfect.Too many trees in the way.
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The false color images are generated by combining the two channels depending on which instrument they come from.Ĭlicking on the images below will take you the the album page where you can get the full resolution images. NOAA-18 was transmitting a visible and a thermal infrared image, all others were transmitting near infrared and thermal infrared images. Note the satellites transmit two images side by side, each image being taken by one of four (tbc) instruments, so that we get data from two different instruments during one pass. I believe that’s the complete fleet of active NOAA POES satellites. I have successfully received images from NOAA-15, NOAA-17, NOAA-18 and NOAA-19.
Neither GNU Radio nor wxtoimg support pulseaudio that would allow routing the audio from one application to another without going through the audio hardware. Real-time decoding could be done by feeding the audio into another computer runnign wxtoimg however, I think the quality would be compromised be sending the audio data over two louzy sound devices.
I’m sure there is an easier way to do all this… Change the timestamp of the new WAV file to match recording time: touch -t YYMMDDhhmm.ss filename.wav – otherwise wxtoimg will not be able to detect during which pass the recording was made.Export to 16 bit signed WAV (don’t forget to also change the Project Rate otherwise it will export in 48kHz) Audacity: trim and resample to 11.025kHz.GNU Radio receiver records 44.1 kHz WAV.I have then transcoded tha WAV file to 16 bit signed, 11.025 kHz using VLC and Audacity, which then was decoded using wxtoimg. The audio output from the demodulator is also dumped to a WAV file. If you want to use the cool sound of NOAA satellites in your next music composition or video let me know ? The video below shows the playback of the recorded IQ data from a NOAA-15 pass. The latter is necessary to maintain a constant sample rate that was used to record the data. The playback program is a simple WFM receiver where the USRP source is replaced with a file source and a throttle block. Being able to hear the APT signal during recording helped me point the antenna in the right direction ? The only required function of the data recorder is to dump the USRP data directly to a binary file however, I also included a WFM receiver. I wasn’t attempting real-time decoding of the images - I only wanted to test the IQ data recording and playback I have described here and here.
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On the software side I used simple WFM receiver implemented in GNU Radio Companion and a free version of WXtoImg for decoding the images. I used my Arrow II 3 element handheld yagi for 145 MHz and of course the USRP with the WBX daughterboard. I only wanted to explore IQ data recording and playback with GNU Radio but when I first used NOAA 15 as test signal and saw what I could receive I got slightly distracted from my original plan. This weekend I ended up receiving APT signals from NOAA polar orbiting weather satellites.