"Mode S and ACAS" Programme Support

At the EUROCONTROL Experimental Centre (EEC), we carry out validation activities in support of EUROCONTROL's "Mode S & ACAS" programme.

The "Mode S & ACAS" programme

ACAS means "Airborne Collision Avoidance System".

The "Mode S & ACAS" programme encompasses those activities that are carried out to improve the safety of the air transport system in general, and the efficiency of the ATM system in particular, by means of the co-ordinated introduction of the Mode S surveillance system and an airborne collision avoidance system.
  HTML The "Mode S & ACAS" programme

What we do at the EEC

The activities that are conducted at the EEC to support the "Mode S & ACAS" programme consist of:
  • studying the performance of Mode S transponder avionics installations, to investigate detected Mode S surveillance problems;
  • making measurements of, and analysing, the occupancy of the surveillance frequency band (1030 kHz-1090 kHz);
  • providing support to aircraft operators and ANSPs on transponder and installation functionality problems;
  • providing an analysis of the trends of ACAS operational performance trend analysis;
  • providing support to states and ANSPs (air navigation service providers) for ACAS incident analysis; and
  • providing operational data to support the development of TCAS II modifications. (TCAS is the Traffic Collision Avoidance System.)

The "Mode S" project

Mode S is based on a logical development of the secondary surveillance radar (SSR) system currently deployed throughout the whole European Civil Aviation Conference (ECAC) area. In addition to SSR functionality, Mode S enables the selective interrogation of aircraft and the extraction of air-derived data through which new ATM functionality can be developed.
  HTML The "Mode S" project
Last validation: 24/04/2008