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floripasat / grs

Ground Station Software
GNU General Public License v3.0
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Sample Audio Files? #28

Open K4KDR opened 4 years ago

K4KDR commented 4 years ago

Could you please make available sample audio files for us to test the beacon & telemetry packet decoders?

Thank you and best wishes for success with your satellite!

-Scott, K4KDR

janvgils commented 4 years ago

I second this request, maybe something similar to what the OPS-SAT team shared with the community. (https://github.com/esa/gr-opssat/tree/master/recordings)

Good luck with your mission

Jan - PE0SAT

mgm8 commented 4 years ago

@K4KDR @janvgils Some example .wav files are available here now:https://github.com/floripasat/grs/tree/master/samples.

janvgils commented 4 years ago

@mgm8 Thanks, can you share some details, are these raw IQ? What is the sample rate, I tried to replay them in GQRX but it didn't work.

I tried the following: device="file=beacon_gqrx_20190429_214831_145900000.wav,freq=145.9e6,rate=48e3,repeat=true,throttle=true"

mgm8 commented 4 years ago

@janvgils these .wav files are recordings from GQRX (using a RTL-SDR) captured during the development of the satellite in our lab. These are not raw IQ, it is the output signal after the NFM demodulator of GQRX. The sample rate is 48 kHz and the data format is 32-bit float.

For example, opening the beacon file using Audacity, you can see the waveform of the baseband signal transmitted by the satellite:

beacon_audacity

beacon-waveform

You can also see the content of the packets by opening these .wav files on our software and pressing the "play" button:

grs-audio-file

janvgils commented 4 years ago

Thank you for taking the time to explain this, I will test the setup with these files.

All the best.