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The overall project objectives of NEAP were to investigate, specify, develop, test and evaluate civil aviation user applications and services within an integrated communications, navigation and surveillance (CNS) concept. Activities focused on the following domains:
- Enhanced surveillance for Air Traffic Control (ATC)
- Pilot situation awareness
- GNSS (Global Navigation Satellite System) precision navigation capability for all phases of flight.
The results on the applications level essentially verified the operational feasibility of the evaluated application or service as well as the ability of the technical system to support it. Specific proposals for system improvements were presented. The main findings on the system level are:
Operational:
- ADS-B for surveillance and as a basis for several other CNS services is feasible in all phases of flight, including surface operations. It works equally well on different types of aircraft, helicopters and ground vehicles. Capacity and safety can be improved in unserved airspace by using ADS-B. However, the operational concept of ADS-B is not complete, for instance, it lacks requirements for efficient aircraft and ATC implementation. Operational use of ADS-B in airborne and ATC installations requires careful analysis of Human Machine Interface (HMI) issues.
- Organised broadcast services of DGNSS, TIS-B and FIS-B (e.g. ATIS) is feasible and potentially very spectrum efficient. Coverage is the same as for ADS-B.
- Operational implementation of STDMA/ VDL Mode 4 requires close co-ordination between ground service providers (CAAs).
- The aviation community currently lacks sufficient guidance on emerging CNS/ATM concepts.
Technical
- The combination of CNS services using a common technical platform is feasible. STDMA/VDL Mode 4 provides a suitable system solution.
- STDMA/VDL Mode 4 is a feasible system solution for a ground-based regional augmentation system (GRAS). From a technical viewpoint, uplinked GNSS augmentation messages can be combined with ADS-B downlink on the same data link and channel. The combination of a SCAT-I ground station with an STDMA/VDL Mode 4 data link is potentially a viable technical solution for GRAS.
- STDMA/ VDL Mode 4 message throughput is not fully satisfactory under all conditions.
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