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Automatic Dependent Surveillance (ADS) & Controller-Pilot Data Link Communications (CPDLC)

The ADS/CPDLC system indicates the location of an aircraft in flight based on an ADS report from the pilot and CPDLC messages on a screen.

 Function  Standard Number
AFN  Complies with ARINC622-2
ADS  Complies with ARINC745-2
CPDLC  Complies with RTCA DO-219

The NEC ADS/CPDLC system works on a PC basis in compliance with FANS-1/A standards.

Major Functions

  • Alert Function (AFN)
  • CDPLC Uplink Message Input
  • CPDLC Downlink Message Display
  • Data Link Transfer
  • ADS Request Input
  • ADS Report Display
  • Map Display

Examples of Screens

ADS Display Screen

Automatic Dependent Surveillance

An aircraft automatically transmits a report on its current and planned position to ground control.

CPDLC Message Display Screen

Controller – Pilot Data Link Communications
Position reports and clearance requests are communicated using a template format (140 formats for uplinks and 80 for downlinks).

System Configuration

ADS/CPDLC Training System

NEC's ADS/CPDLC training system has been developed to ensure a thorough understanding of ADS/CPDLC operation for both pilots and controllers.

Flight Progress Display

Aircraft information (including passing position and estimated passing time) is displayed on the ADS/CPDLC Workstation.

Playback Function

The Playback function records training data and can recreate any situation using data recorded on the ADS/CPDLC Workstation.

Conflict Alert Function

The ADS/CPDLC Workstation monitors the potential for conflict among aircraft and displays an alert if the workstation detects conflict. The conflict alert indicator can be turned on and off.

AIDC Function

By using two ADS/CPDLC Workstations, ATS* Interfacility Data Communications(AIDC) training can be conducted. AIDC messages for advisories, coordination, and handoffs are exchanged between ATS units.
*Air traffic service

Air Traffic Control
Airport operations