Advanced Safe Separation Technologies and Algorithm

Programme Information

Short Name:
January 2005 - November 2007
107.300 €
Programme Partners:

Programme Description

Air transport around the world, and particularly in Europe, experienced major capacity, efficiency and environmental challenges to improve performance. The Airborne Separation Assistance System (ASAS) uses ADS-B (Automatic Dependent Surveillance-Broadcast) data to provide improved airborne surveillance in support of new procedures for controllers and pilots.

ASSTAR addressed these issues by researching and validating two areas of ASAS Package II functionality, which are expected to provide significant benefits in terms of operational and environmental improvements in the short-term.


The objective of ASSTAR was to perform research into the operational and safety aspects underlying the introduction of the following two key ASAS Package II applications with the aim of realising the significant potential benefit to the user community in the 2010-plus time frame:

  • The delegation of conflict resolution manoeuvres to the air, in radar controlled airspace (i.e. ASAS crossing and passing), in order to reduce controller workload and improve flight efficiency.
  • The use of ADS-B to support new operations in oceanic and other non-radar airspace, enabling more optimal routing, including enhanced use of wind corridors and passing and level changing, that are currently severely restricted due to the procedural separation standards.