The TCAS II (Traffic Alert and Collision Avoidance System) is the cornerstone of modern aviation safety, enabling aircraft to coordinate autonomous evasive maneuvers via the Mode-S protocol.

📡 Specifiche Hardware & Parametri RF

  • Frequency: 1090 MHz
  • Gain: 3-5 dBi
  • NF: < 1.5 dB
  • SDR: RTL-SDR Blog V3 or Airspy R2
Dettaglio operativo Decodifica TCAS II Resolution Advisory (BDS 3,0): Manovre Evasive Anti-Collisione sui 1090 MHz
📸 Fotografia autentica da Wikimedia Commons: Decodifica TCAS II Resolution Advisory (BDS 3,0): Manovre Evasive Anti-Collisione sui 1090 MHz

RF Architecture and Signal Reception

Receiving BDS 3,0 messages requires a receive chain optimized for low phase noise. Cavity bandpass filters are preferred over SAW filters for 1090 MHz selectivity.

LNA and Bias-Tee Preamplifiers

Integrating an LNA near the antenna, powered via Bias-Tee, is essential to compensate for coaxial cable losses.

Parameter / ComponentOptimal Value / Description
Frequency1090 MHz
FilterCavity Bandpass
LNA Gain15-20 dB
💡 Pro-Tip Installation: Keep coaxial cable runs under 5 meters to avoid excessive signal attenuation.
“The accuracy of TCAS II monitoring depends entirely on the cleanliness of the received RF signal.”

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