kopia lustrzana https://github.com/proto17/dji_droneid
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@ -72,3 +72,26 @@ A new window will pop up with the signal parameters. From top to bottom:
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- `Initial Byte Offset`: `0`
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- `Sample Rate`: Change to `Custom` and enter the sample rate (in Hz) of your collected file (mine was 30720000)
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- `Channels`: `2` and check both `Quadrature` and `Flip Complex`
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- `Decode Format`: This will depend on how you collected the signal. If you used `osmocom_fft` or my graph example then this will be `32-bit float`. If you used the HackRF command line tool, then this might be `8-bit linear (signed)`. Otherwise it's going to be `16-bit linear` as that's really the only other common sample size. Do not change the endianness unless you really know what you're doing!
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- `Normalization`: `auto measure`
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![image](https://user-images.githubusercontent.com/4240543/162874818-bd2bff86-7b69-4d3a-8352-926743adf5cb.png)
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Click on `Open` and the popup should go away and the main window should update with something similar to the following
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![image](https://user-images.githubusercontent.com/4240543/162874903-0db9ffc1-a9d4-40ff-bdd4-56ae3aa2fa26.png)
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The first thing to do is fix the FFT size. Right click in the main window, select `Processing` -> `Transform Size`, and select `4096`. Dropping the FFT size is fine now that the file is loaded. Any size over 4096 usually results in having to scroll left and right to see the full bandwidth.
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![image](https://user-images.githubusercontent.com/4240543/162875065-580cfee6-144d-4b11-b055-8dcb8ac972a4.png)
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In my case the collect was long enough that `baudline` didn't show my anything useful at first. This happend because `baudline` zooms you all they way out at first. So you're seeing the entire collect in one window. To zoom in press `alt` and scroll forward with the mouse wheel (might be the `windows` key for some window managers). You should hopefully see something like this after scrolling and zooming around
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![image](https://user-images.githubusercontent.com/4240543/162875284-d4eb7a59-13a9-4897-b422-b10aae43e600.png)
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That is a DroneID burst!
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The important information that we need now is when does the burst start, and how long does it stay active. Handily, `baudline` gives us tools for doing just that. Right click in the main window and select `measure` -> `system` and select `delta selected`, then go to the same menu again and select `cursor time`.
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By default the windows might be absolutely tiny. If they are, click on one of them and press the up arrow until they are the correct size
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![image](https://user-images.githubusercontent.com/4240543/162875585-14dcbacd-0f9b-4de2-8af9-28892c2a4c13.png)
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