What Is Mode S?

• Airborne Data Link
• Unique Permanent ID (24 Bit Address)
• Selective Interrogation
• Ground Initiated COMM B (GICB)
  • Elementary (ELS) and Enhanced Surveillance (EHS)
• Required for TCAS II/ACAS II
• Required in Europe 2005 with EHS
  

What Is 1090 ES ADS-B?

• Self Report ID, Position, Altitude, and Vector - Improved SA
• 1090 Receive and CDTI Required

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