SDR Airband Demodulator
Real-time audio output of aviation radio communication.
The RTL-SDR used for the implementation of the flight radio demodulator is a cost-effective Software-Defined Radio (SDR) with a consumer purchase price of approximately €25. This SDR can be dynamically reconfigured within the frequency range of 24-1800 MHz through a USB interface, and it outputs received HF signals in digitized form as I/Q signals.
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The requirements for the flight radio demodulator were defined as follows:
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Demodulation of the A3E double sideband-modulated aviation radio signal.
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Real-time output of the aviation radio through an audio interface for Linux devices (44.1 kHz).
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Selection option for signals within the reception range.
Live aviation radio on the home computer
Unser Beitrag
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Design of driver software to interact with the SDR
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Implementation of a scanning routine that captures aviation radio signals with sufficient reception strength
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Digital demodulation and filtering of a desired aviation radio signal
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Reduction of negative influences of the SDR on the signal through average filtering and offset tuning
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Resampling of the signal to 44.1 kHz
The set goals of the flight radio demodulator software have been achieved.
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The application detects signals within the frequency range of 108 - 137 MHz within 2 seconds
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Demodulation and output of the signal occur in real-time
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A good signal-to-noise ratio has been achieved for a pleasant listening experience
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Results
