The document discusses the European Geostationary Navigation Overlay Service (EGNOS). EGNOS is Europe's regional satellite-based augmentation system that improves the accuracy and reliability of Global Navigation Satellite Systems like GPS and Galileo. It consists of a ground segment with reference stations, a space segment of geostationary satellites, and a user segment of EGNOS receivers. EGNOS provides open services that correct for errors and integrity services for safety-critical applications like aviation.

1. (European Geostationary
Navigation Overlay Service)
Presenters:
Nimesh Bhandari (04)
Purna Bahadur Saud (22)
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Presented To:
Ranju Pote
Lecturer
Department of Geomatics
Engineering

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Topics Covered
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Introduction
Working Mechanism of EGNOS
EGNOS System Architecture
EGNOS Services

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Introduction
• Europe’s regional satellite based augmentation system
• Improves the performance, accuracy and reliability of GNSSs, such as
GPS and Galileo
• Started by European Commission and European Space Agency.
• Also provides a crucial integrity message regarding the continuity and
availability of a signal
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Working Mechanism
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Figure 1 : Working Mechanism of EGNOS

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Continued…
• Reference stations pick up GNSS measurement signals
• Signal passed to master control station
• Estimates integrity data and WAD corrections for service area
• Calculations broadcasted the user via EGNOS Geostationary satellites
• Augmented with integrity and corrections message
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EGNOS System Architecture
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EGNOS
Segments
Ground Segment
Space Segment
User Segment
Figure 2 : EGNOS System Architecture

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EGNOS System Architecture
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Figure 3 : EGNOS Ground Stations

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Ground Segment
• 40 Ranging Integrity Monitoring Stations (RIMS),
• 2 Mission Control Centers (MCC),
• 2 Navigation Land Earth Stations (NLES) per Geostationary orbits,
and
• The EGNOS Wide Area Network (EWAN)
• Compute precise differential corrections and estimate integrity data
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Space Segment
• Composed of at least three Geostationary satellites centered over
Europe
• Provide redundant data transmission channel to broadcast corrections
and integrity information to the EGNOS users
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User Segment
• Consist of EGNOS receivers
• Enable users to accurately compute their positions with integrity
• EGNOS compatible receivers available for market segments:
• Agriculture,
• Aviation,
• Maritime,
• Rail,
• Mapping/Surveying,
• Road and Location Based Services (LBS).
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EGNOS Services
1. Open Services
• Objective: To improve achievable positioning accuracy by correcting
several GNSS error sources.
• Helps mitigating ranging error sources related to satellite clocks
satellite position and ionospheric effect
• EGNOS can also detect distortions affecting the signals transmitted by
GNSS
• Freely available to any user in Europe
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EGNOS Services
2. Safety of Life (SoL) Service
• Objective: To support civil aviation operations down to Localizer
Performance with Vertical Guidance (LPV) minima
• Can also be used in other application domains like, maritime, rail road
etc.
• Benefit: Provides reliable vertical guidance at any
airport in Europe, without need of additional local
ground based infrastructure
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EGNOS Services
3. EGNOS Data Access Service (EDAS)
• Provides authorized customers EGNOS products for commercial
distribution
• Provides opportunity to deliver EGNOS data of perturbing area like
the area surrounded by tall buildings
• Only a single point of access for the data collected and generated by
EGNOS ground infrastructure.
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References
• Gauthier, L., Michel, P., Ventura-Traveset, J., & Benedicto, J. (2001). EGNOS: The
first step in Europe’s contribution to the global navigation satellite system. ESA
Bulletin, 105, 35–42.
• Ventura-Traveset, J., López de Echazarreta, C., Lam, J.-P., & Flament, D. (2015). An
Introduction to EGNOS: The European Geostationary Navigation Overlay System.
In GALILEO Positioning Technology (pp. 323–358). Springer.
• EGNOS Services—Navipedia. (n.d.). Retrieved April 17, 2022, from
https://gssc.esa.int/navipedia/index.php/EGNOS_Services
• EGNOS System. (2016, March 1). https://www.euspa.europa.eu/european-
space/egnos/egnos-system
• What is EGNOS? (n.d.). Retrieved April 17, 2022, from
https://www.esa.int/Applications/Navigation/EGNOS/What_is_EGNOS
• Felski, A., Nowak, A., & Wozniak, T. (2011). Accuracy and availability of EGNOS-
results of observations. Artificial Satellites, 46(3), 111.
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