Surveillance Analysis Support System for ATC-Centre (SASS-C)

The Surveillance Analysis Support System for ATC Centres (SASS-C) is software developed by EUROCONTROL. To ensure its stability and reliability, the Agency also provides updates, maintenance and support to SASS-C along with standardised methods for assessing the performance of surveillance infrastructures.

SASS‑C provides interoperable top-level verification (VERIF) and prediction (PREDICT) functionality to civil and military Air Navigation Service Providers (ANSPs), R&D organisations and the ATM industry.


Surveillance Analysis Support System for ATC-Centres (SASS-C)

VERIFication function

The SASS‑C verification function has three objectives:

  • to verify the compliance of the surveillance infrastructure (ATM Surveillance Sensors and Surveillance Data Processing and Distribution System) with EUROCONTROL’s current surveillance standards and specifications;
  • to support air incident investigation, with a particular focus on surveillance aspects;
  • to support the development and implementation of new ATM surveillance systems.

The verification function has five steps:

  • acquiring and importing data in a variety of surveillance formats;
  • reconstructing multi-sensor surveillance data to build a reference for each flight;
  • comparing reported data to the reconstructed reference;
  • aggregating and reporting comparisons against standard-defined thresholds;
  • investigating, enabled via visual representation to the user.

SASS-C’s verification function can be applied to all current surveillance techniques and technologies (PSR, SSR, ADS-B, Multilateration). Evolutions for handling Multi Static Primary Surveillance (MSPS(R)) and Surface Movement Area-specific sensors and Surface Movement Area-specific type of motion as  considered in the future.

SASS-C’s verification function provides a cost-effective, 24/7 performance monitoring solution.

PREDICTion function

The SASS-C prediction functionality enables the theoretical calculation of surveillance infrastructure performance, probability of receipt of message, calculating for environment interference, and position measurement accuracy. The function is characterised by:

  • a 3D grid approach (based on Digital Terrain Elevation Data – DTED - resolutions) for calculating, storing and displaying the results;
  • a design facilitating the input of multiple levels of digital terrain elevation data quality. For every single location, it will use the best terrain data available;
  • the ability to calculate a multiplicity of perspectives by the Surveillance System at any point in space.

The prediction function implements a generic Surveillance Infrastructure model supporting sectorised radar and multi-sectored systems.

SASS-C runs on x86_64 based hardware and Linux of the RHEL family.

Obtaining SASS-C

SASS-C software is distributed free of charge to the EUROCONTROL Member State’s Organisations (EMSOs), upon signature of a license agreement. An EMSO is an organisation mandated by any EUROCONTROL Member States to provide air traffic services in their territory, whether this organisation is state-owned or privatised. Member State military organisations are de facto EMSOs. An industry providing services to an EMSO is considered to be an EMSO for this purpose.

For Non-EUROCONTROL Member State Organisations (NEMSOs), SASS-C may be made available subject to the signature of a license agreement but also upon payment of an acquisition fee of €20,000, then a €5,000 EUR yearly maintenance fee. Any organisation outside EUROCONTROL Member States and the manufacturing industry  whether located inside a Member State or not are considered as NEMSOs. An EMSO providing services outside EUROCONTROL Member States is considered to be a NEMSO for this purpose.

SASS-C Maintenance And Support (SACMAS) service is only available to EMSOs.

Subscription requests should be submitted by completing this form. Here are some examples of EMSO user license agreement, NEMSO user license agreement.

For questions concerning licensing please contact out Licensing Requests team. For other questions please send an e-mail to the SASS-C Management team.

Related programmes: 
Centralised ARTAS Maintenance and Operational Support (CAMOS)Surveillance Modernisation

SASS-C License requests

For any questions regarding licensing, please contact us:

SASS-C Management

For further information and support, please contact us: