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Page 1División de Navegación por Satélite GPS and EGNOS in the EUR- SAM CORRIDOR Lisardo Rodríguez Rabanal División de Navegación por Satélite Unidad EGNOS.

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Presentation on theme: "Page 1División de Navegación por Satélite GPS and EGNOS in the EUR- SAM CORRIDOR Lisardo Rodríguez Rabanal División de Navegación por Satélite Unidad EGNOS."— Presentation transcript:

1 Page 1División de Navegación por Satélite GPS and EGNOS in the EUR- SAM CORRIDOR Lisardo Rodríguez Rabanal División de Navegación por Satélite Unidad EGNOS Torrejón

2 Page 2División de Navegación por Satélite INDEX 1.What is EGNOS? 2.EGNOS ARCHITECTURE 3.RNP FOR SBAS 4.EGNOS COVERAGE AREA 5.PERFORMANCES OVERVIEW 6.EGNOS INTEGRITY 7.CONCLUSIONS

3 Page 3División de Navegación por Satélite WHAT IS EGNOS? EGNOS (European Geostationary Navigation Overlay Service) is the European SBAS (Satellite Based Augmentation System) compliant with the OACI standard (Annex 10 of SARPS) EGNOS uses the GPS and GLONASS constellations as well as additional geostationary satellites which signals are collected by a network of ground stations for generating the EGNOS navigation message

4 Page 4División de Navegación por Satélite EGNOS ARCHITECTURE ( 2 INMARSAT III + 1 Artemis ) GPS GLONASS Red EGNOS (EWAN) NLES (dos por GEO) Ranging Integrity and Monitoring Stations MCC1MCC2MCC3MCC4 Mission Control Centres PACFASQF RIMS1 RIMS2RIMS … n Support Segment DVP ( 2 INMARSAT III + 1 Artemis ) Ground Segment User Segment GPS GLONASS EGNOS Network (EWAN) NLES MCC1MCC2MCC3MCC4 PACFASQF RIMS1 RIMS2RIMS 34 Spatial Segment DVP

5 Page 5División de Navegación por Satélite RNP FOR SBAS (I) ACCURACY difference between the estimated position and the actual position. INTEGRITY is a measure of the trust which can be placed in the correctness of the information supplied by the system. Integrity includes the availability of the system to provide timely and valid warnings to the user (alerts) when the system must not be used for the intended operation.

6 Page 6División de Navegación por Satélite RNP FOR SBAS (II) CONTINUITY It is the probability that the system will function properly for the duration of the flight operation given that the system was functioning properly at the beginning of the operation. AVAILABILITY The portion of time during which the system is to be used for navigation during which reliable navigation information is presented to the crew, autopilot or other system managing the flight of the aircraft.

7 Page 7División de Navegación por Satélite RNP FOR SBAS (III)

8 Page 8División de Navegación por Satélite EGNOS COVERAGE AREA EGNOS shall provide down to and including RNP 0.3 in the joint union of the ECAC Flight Information Regions (FIR). The shaded area comprises the footprint of all FIR of ECAC member States (including Canary Islands FIR) and the oceanic control areas of Reykjavik, Shanwick and Santa Maria.

9 Page 9División de Navegación por Satélite PERFORMANCES OVERVIEW (GPS)

10 Page 10División de Navegación por Satélite PERFORMANCES OVERVIEW (GPS)

11 Page 11División de Navegación por Satélite PERFORMANCES OVERVIEW The accuracy of GPS achieved in the Canary Islands is quite good. As the Canary Islands are located in the border of the EGNOS service area (landmasses of the ECAC) the EGNOS accuracy will be quite similar to the GPS one. The reason is that some satellites are discarded during the solution computation because of the lack of the ionospheric computation.

12 Page 12División de Navegación por Satélite EGNOS IONOSPHERIC MODEL

13 Page 13División de Navegación por Satélite SATELLITES USED vs. IN VIEW

14 Page 14División de Navegación por Satélite EGNOS INTEGRITY So the GPS/GLONASS performances in terms of accuracy could achieve the required performances for En-route, Terminal Area and Non-Precision Approach. However GPS as standalone system does not reach the performances in terms of integrity, continuity and availability. We need a measure of the trust which can be placed in the correctness of the navigation solution and timely alerts to the users when the navigation system must not be used for the intended operation.

15 Page 15División de Navegación por Satélite EGNOS INTEGRITY To ensure that the GNSS position error is acceptable an alert limit is defined that represents the largest position error which results in a safe operation. At the same time EGNOS provides us the means to compute an estimation of the navigation error (Protection Level). Position errors greater than the alarm limit must be indicated to the crew, otherwise integrity has failed and flight safety is at risk. The GNSS integrity requirement is validated my means of measurements and simulations (due to the stringent probability ) checking that the Navigation Error is bounded by the Protection Level.

16 Page 16División de Navegación por Satélite EGNOS INTEGRITY (SIMULATIONS) The next slides contain results obtained with the EGNOS End-To-End Simulator. A constellation of 27 GPS satellites + 1 EGNOS GEO has been configured. The EGNOS performances are evaluated in several airports in Canary Islands The results allow us to obtain an overview of the accuracy and integrity achieved with EGNOS in the Canary Islands.

17 Page 17División de Navegación por Satélite APV-I IN LANZAROTE

18 Page 18División de Navegación por Satélite APV-I IN LANZAROTE

19 Page 19División de Navegación por Satélite CONCLUSIONS Good GPS accuracy in the Canary Islands region When you get a GPS navigation signal, how do you know you can trust it? ðEGNOS will tell you whether you can trust the signal. It will tell you that you are at a particular spot with a high degree of certainty and definitely within an area enclosed by a circle with the spot at the centre. In effect, it will give you your position and say by how much it could be out.

20 Page 20División de Navegación por Satélite CONCLUSIONS En-route phases of flight can also take advantage of the EGNOS Integrity, Continuity and Availability benefits Operational EGNOS (Operational Validation, ATC interface, Procedures Design)

21 Page 21División de Navegación por Satélite CONTACT DETAILS Lisardo Rodríguez Rabanal Aena / Satellite Navigation Division EGNOS UNIT Phone: /


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