Toulouse, FranceESSP SAS
The European Geostationary Navigation Overlay Service (EGNOS) provides an augmentation service to the Global Positioning System (GPS) Standard Positioning Service (SPS). Presently, EGNOS augments GPS using the L1 (1575.42 MHz) Coarse/Acquisition (C/A) civilian signal function by providing correction data and integrity information for improving positioning, navigation and timing services over Europe.
Since 2nd March 2011, when officially declared available, the EGNOS Safety of Life (SoL) Service is provided openly and is freely accessible without any direct charge, tailored to safety-critical transport applications in various domains, in particular for aviation applications. The first and main objective of the EGNOS SoL Service is to support civil aviation flight operations down to LPV (Localizer Performance with Vertical guidance) minima in approach procedures to aerodromes and helipads. The service is thus compliant with the aviation APV-I (Approach with Vertical Guidance) signal-in-space performance requirements, as defined by ICAO in Annex 10.
As of September 20th 2015 , a new EGNOS SoL service level is officially declared available to users. This new Sol service level is named LPV-200. The LPV-200 capability is supported by the deployment and entry into operations of the EGNOS System release 2.4.1M.
- Contribution to reducing ATM costs
- Contribution to reducing the impact of air transport on the environment
- Early implementation
- Potential to be replicated over the ATM network
- Innovative aspects
- Promoting partnerships
- Contribution to change management
The LPV-200 service level declaration is a key milestone for the European Satellite Navigation, and in particular for EGNOS programme. LPV-200 brings relevant extra operational benefits to EGNOS users and indirect benefits to European citizens in terms of productivity, competitiveness, environment, quality of life, jobs and social development due to the fact that EGNOS LPV-200 contributes to the improvement of the European transport network. The new LPV-200 service level is also considered a key enabler in the implementation of the PBN concept in Europe within the Single European Sky (SES) framework.
Focusing on the operational aspects, with respect to existing EGNOS APV-I service level, LPV-200 provides added value to airspace users in terms of increase of accessibility to airports and reduction of delays, diversions and cancellations while maintaining today’s high safety levels. The reason is that with LPV-200 capability, the potential best Decision Height (DH) in an approach to a certain runway end is lowered from a minima of 250ft (related to APV-I service level) to a minima of 200ft, and consequently the uncertainty of landing in bad weather conditions is reduced implying a substantial drop in delays, diversions and flight cancellations (and thus cuts in costs and fuel). In addition, LPV-200 service level provides a higher improvement of the efficiency of aviation operations, lower environmental impact (less CO2 emissions), a potential increase of airspace capacity and a significant reduction of both ATC and pilot workload. All these benefits are given without the need to upgrade the existing certified EGNOS user receivers.
As stated in ICAO Annex 6, and based on this new service level, it is important to remark that this is the first time that EGNOS SoL service enables approach procedures designed for 3D instrument approach operations Type A or Type B. LPV-200 service level enables approaches quite similar to ILS, providing lateral and angular vertical guidance without any required visual contact to the ground until a Decision Height (DH) up to only 200 ft above the runway. These precision approaches based on EGNOS are considered ILS look-alike approaches with no ground infrastructure needed. Being free of charge, LPV-200 capability will allow for savings in maintenance costs associated with ground-based conventional navigation aids used for approach purposes. So, LPV-200 based approaches guarantee all the advantages provided by an ILS approach with the airspace design flexibility of a PBN approach.
LPV-200 EGNOS performances allow taking full advantage of the PBN advanced procedures as RNP with transition to RNP APCH down to LPV200 minima, curved, steep and segmented approaches, increasing significantly the ATM flexibility and providing direct environmental and economic benefits and cost savings.
European GNSS benefits all EU citizens. In Europe, a growing number of economic sectors, in particular transport, telecommunications, agriculture and energy, increasingly use satellite navigation systems. Developing the use of satellite navigation and improving the GNSS infrastructure and services provided bring enormous benefits to the economy, society and the environment, and the new EGNOS LPV-200 service level is one of these GNSS service improvements.
The implementation of LPV-200 based operations could directly result in an important improvement on the existing Air Navigation capabilities and infrastructure, and therefore contribute to the socio-economic growth. It is well recognized that the improvement on the European transport infrastructure is a key factor for the development of local and regional industry and economy, enforced by exportations or promoting the external industry settled down that might be attracted by the regional market and capacities and contributing to workplaces increase. Indirectly, LPV-200 service level implementation will also bring public benefits generated by a reduction in pollution or by improved levels of safety.
The EGNOS SoL Service Definition Document (SDD) describing the characteristics, terms and conditions of access to the EGNOS SoL service offered to users, in particular for LPV-200, can be found in the EGNOS users support website (http://egnos-user-support.essp-sas.eu/ ).