Here's an interesting software find. It's a NOAA weather satellite APT decoder written in Rust. You can capture the satellite signals with a cheap SDR device as an audio file and use this program to convert it to satellite imagery.https://github.com/martinber/noaa-apt …
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For anyone interested in trying this, I found a website that interpolates their location and also lists their individual downlink frequency. NOAA 15: https://www.n2yo.com/satellite/?s=25338 … NOAA 18: https://www.n2yo.com/satellite/?s=28654 … NOAA 19: https://www.n2yo.com/satellite/?s=33591 … It even estimates the next flyby.pic.twitter.com/2PLi8Ybjar
1 reply 0 proslijeđenih tweetova 2 korisnika označavaju da im se sviđaPrikaži ovu nit -
Satellite predictions
120° dipole (52cm rods)
SDR device
Recording + decoding software
Now I just need to wait for a good flyby and hope there isn't too much interference.pic.twitter.com/jbJJGc1AwF
1 reply 0 proslijeđenih tweetova 1 korisnik označava da mu se sviđaPrikaži ovu nit -
I was definitely able to pick up the signal (you can see the left vs right channels in the image and the right-hand bars). But it's SUPER noisy. Not sure if I just need a better antenna setup or if I need to go out in the hill country some day and try this away from noise.pic.twitter.com/mOzT1cBy6v
1 reply 0 proslijeđenih tweetova 1 korisnik označava da mu se sviđaPrikaži ovu nit -
The frustrating thing is that the satellites only fly by closely every so often which doesn't leave much time to figure out the best setup.
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Got a much better capture this morning. Last night there was an interference source pulsing about every 5 seconds. It's gone today but I only caught the tail end of this pass (by accident!). Now I know that I can do it as long as I time it right and don't have that interference.pic.twitter.com/2PvmolLwuM
1 reply 0 proslijeđenih tweetova 3 korisnika označavaju da im se sviđaPrikaži ovu nit -
Since you can predict when they pass it would be pretty easy to automate captures. In fact, since I'm only using Gqrx to capture a demodulated FM signal, this "spirit box" script I wrote for Halloween could be rewritten to tune in and capture each pass.https://github.com/wybiral/spirit-box/blob/master/main.py …
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Caught some signal from NOAA 18. It was over CA and I'm receiving from TX so there was a lot of noise. But still better than my first attempt.pic.twitter.com/SkShLpnL2H
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I'm gradually getting better at capturing these. So far the best demodulation settings seem to be using a bandwidth of 45 kHz, a narrow FM with maximum deviation of 17 kHz. Still using a horizontal 120° dipole 52cm rods.pic.twitter.com/4K7ExAFc94
1 reply 0 proslijeđenih tweetova 2 korisnika označavaju da im se sviđaPrikaži ovu nit -
The signal from this one is too weak for an image (it's east of FL and I'm in TX) but this is what their waterfall plot looks like for anyone curious.pic.twitter.com/2Thw2EcNrZ
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I'm going to consider this a success. The satellite signal was caught from indoors using the same antenna/demodulation setup as before but this time NOAA 15 flew almost directly above Austin. Unfortunately it's really cloudy today, but still... It works!pic.twitter.com/sXXJDFcKpE
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Odgovor korisniku/ci @davywtf
Awesome
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Odgovor korisniku/ci @davywtf
Such a cool project. Great work!
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