Optimum Receiver for Decoding Automatic Dependent Surveillance Broadcast (ADS-B) Signals

Air traffic control (ATC) radar has been the main sensor for the detection and monitoring of commercial aircrafts for air traffic management. Typical modern ATC radar consists of a primary radar and secondary radar which is limited by high acquisition, installation and maintenance cost. Automatic Dependent Surveillance-Broadcast (ADS-B) system is the next generation locating system to complement existing ATC radar system. This paper looks into the design of an optimum receiver to decode ADS-B signal. The work consists of three sections; modulator, demodulator and performance verification. To ensure compatible to the industrial standards, the message format and its verification process is based on the ICAO (International Civil Aviation Organizations) standards. A non-coherent detection structure (based on energy detection) was adopted at the receiver to improve performance at low signal-to-noise ratio (SNR) condition. Performance results show that simulated bit-error rate (BER) approximately matches the theoretical BER plot for non-coherent BPPM up to SNR values of 8dB. Also packet error rate (PER) is one at SNR less than 8 dB and zero (no packet error) at SNR of 12dB and above.

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