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METEOR.md 893 B

4 년 전
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  1. ### Meteor M2 decoding
  2. The satellite uses a 72k QPSK 120hz carrier to send very high quality images
  3. ## Receiving
  4. Currently, the satellite is using 137.1Mhz as the center frequency, Wide-FM @ 120Khz. I'm using `rtl_fm` @ 288k and `sox` to capture the raw stream. Most likely, the 288k bandwidth may be lower
  5. ## Decoding steps
  6. 1. Normalize audio stream with `sox gain -n`
  7. 2. Use dbdexter's [meteor_demod](https://github.com/dbdexter-dev/meteor_demod) to convert the audio stream to QPSK symbols at a 72k rate
  8. 3. Use artlav's [medet_arm](https://github.com/artlav/meteor_decoder) to generate a decoded dump and then a false color image
  9. 4. Use dbdexter's [meteor_rectify](https://github.com/dbdexter-dev/meteor_rectify) to correct the visible deformation on Meteor images (wrong aspect ratio)
  10. 1. I made [some changes](rectify.py) to rectify to export to compressed JPG and remove some prints