Complementary PNT: Keeping Aviation on Course

Resilient alternatives and complements to GNSS for reliable positioning, navigation and timing in modern performance-based aviation.

The L-Band Digital Aeronautical Communication System (LDACS)

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  • LDACS provides COM and NAV functionalities in GNSS disruption events.
  • Data (COM) (Authenticated and Encrypted)
  • UTC transfer and range measurements
  • Standalone Resilient PNT
  • Candidate Integrated CNS system

LDACS Two Way Time & Ranging (TWTR)

  • Improved Dilution of Precision --> Improved positioning performance
  • Time Transfer --> provide "alternative" UTC to aircraft systems
  • Relaxed ground network synchronization requirements
  • Less ground stations required --> deployment and maintenance benefits

LDACS-NAV & Modular PNT

The Modular PNT concept combines existing and next-generation terrestrial navigation systems into a unified positioning solution that ensures reliable resilient PNT.

  • Measurement redundancy and improved PDOP
  • Progressive technology deployment