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CLASS is the acronym for CLear Air Situation for uaS, and is part of a Horizon 2020 SESAR-1-2016 call. The CLASS project will merge existing technologies to build the core functions of an Unmanned Traffic Management System (UTMS). This research increases the maturity level of the main technologies required for surveillance of Unmanned Aerial System (UAS, also known as drone) traffic.


Drone technology is on the rise and the number of drones in the air increases at a rapid pace. Unfortunately, drones are hard to detect and they often fly literally below the radar. As a result, the chances of conflicts between drones and manned air traffic (or between drones themselves) would be very high without the current restrictive regulation.However, the different stakeholders are pushing to ease this regulation. This can only be allowed if a sufficient level of safety can be guaranteed. 

Objectives and deliverables of the CLASS project

Functionalities include real-time tracking and display of both cooperative and non-cooperative drones. Whether a drone is cooperative or not has no bearing on whether that drone is flying rogue at its current location. Drones that transmit their location themselves are called cooperative, whereas for non-cooperative drones the locations are observed and tracked by the external system. In both cases, relevant aeronautical data is aggregated and the data from multiple trackers (both on the drones and on the ground-based systems) is merged through data fusion so that the location of all drones in the airspace can be known and displayed.

Based on these functionalities, a real-time centralized UTMS will be developed. This platform will propose an overall view of both the planned and the current real-time UAS traffic situation.

This information will be centralised in real-time in a UTMS to create an overall solution with advanced functions.

CLASS’s goal is to provide all stakeholders, from drone operators to Air Navigation Service Providers (ANSP’s) and authorities, with services tailored for each end-user’s specific needs.

Advanced functions include geo-fencing (where the drone pilot is warned automatically if he trespasses into an unauthorised zone), geo-caging (where the drone pilot is warned that he is leaving a pre-defined zone), conflict detection and resolution.

The performance of these cooperative and non-cooperative drone detection and tracking technologies will be assessed through live experimentations.

The CLASS project complies with U-space services U1, U2 and U3 as defined in the U-space initiative. U1 foundation services provide e-registration, e-identification and geofencing. U2 initial services support the management of drone operations and may include flight planning, flight approval, tracking, airspace dynamic information, and procedural interfaces with air traffic control.

U3 advanced services support more complex operations in dense areas and may include capacity management and assistance for conflict detection. Indeed, the availability of automated Detect And Avoid (DAA) functionalities, in addition to more reliable means of communication, will lead to a significant increase of operations in all environments.

One of the most innovative infrastructure projects ever launched by the European Union, SESAR’s role is to define, develop and deploy what is needed to increase ATM performance and build Europe’s intelligent air transport system.

SESAR is the mechanism that coordinates and concentrates all EU research and development (R&D) activities in ATM, pooling together around 3,000 experts to develop the new generation of ATM by defining, developing and delivering new or improved technologies and procedures.

The vision of SESAR builds on the notion of trajectory-based operations and air navigation services so aircraft can fly their preferred trajectories without being constrained by airspace configurations.