EGNOS High Accuracy Service Analysis
Background & Objectives
The objective of EGNOSHA was to determine under what conditions it would be beneficial to implement an EGNOS V3 high accuracy service in 2020-2035 for various user sectors.
EGNOS is the European SBAS and augments the GPS L1 C/A civilian signal by providing corrections and integrity information for positioning and navigation applications over Europe. The next generation of EGNOS, EGNOS V3, will augment GPS and Galileo constellations in the L1 and L5 bands and will extend the service area to the entire landmasses of EU member states.
The European Commission is defining the long-term evolution of the EGNOS programme beyond the current EGNOS Service Release V3. One potential evolution could lead to the provision of an EGNOS V3 High Accuracy service over Europe.
EGNOSHA project analysed the benefits of a potential EGNOS V3 (i.e. based on Dual Frequency Multi-constellation (DFMC) capability) High Accuracy service able to provide accurate GNSS orbit and clock corrections, atmospheric corrections and integrity alerts to support emerging applications in various sectors (agriculture, road, rail, maritime, etc.).
Work performed & results
The project identified user requirements, determined service provision requirements and assessed how this service could complement the Galileo High Accuracy Service. The work was carried out in three main steps:
• Firstly, the consortium identified the High Accuracy user needs, the market forecast and competitive analysis. Several stakeholders of the value chain from various sectors participated to this activity by providing input, reviewing outcomes and validating the final results. This activity allowed to select the proposed EGNOS High Accuracy service performance levels. Two service levels were defined: an initial service, mainly relying on the EGNOS V3 network of sensor stations, able to provide sub-meter accuracy performance and a preliminary target integrity level and, in a second step, a full operational service able to meet very demanding requirements in terms of accuracy, integrity, convergence level, etc.
• Secondly, a technical feasibility analysis was carried out by assessing different High Accuracy technologies and the technological trends expected in the timeframe 2025-2035. As a result of these analyses, a service provision scheme was proposed and service requirements were specified. In addition, the consortium defined a potential EGNOS High Accuracy service implementation roadmap and the activities on the critical path.
• Lastly, two Cost Benefit Analyses (CBA) were carried out: one to understand the added value of the EGNOS High Accuracy service from the user perspective and a second one to understand the value from the point of view of the service providers. Experts in several application domains contributed to the qualitative and quantitative results of the CBAs carried out by the consortium.
The feasibility assessment of the achievable performance showed that by using a mix of Precise Point Positioning-Real Time Kinematic (PPP-RTK) techniques it would be possible to achieve accuracies of few centimetres; in addition, the provision of ionospheric corrections and the provision of corrections for three frequencies would allow to reach a very fast convergence time. The feasibility assessment also showed that the very demanding target integrity level cannot be reached using state-of-the-art technologies and specific safety analyses in the early steps of the EGNOS High Accuracy service implementation roadmap would be needed to assess what level of performance could be achieved considering the technological progress in 2025+.
EGNOSHA HIGH ACCURACY SERVICE Final Report