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Aircraft Navigation and Flight Computers: Galileo

EGNOS is Europe's Satellite-Based Augmentation System that improves the accuracy of GPS signals for civilian use in Europe. It works by transmitting differential corrections to GPS signals from geostationary satellites. EGNOS improves the accuracy of GPS from around 5 meters to between 1-5 meters. EGNOS coverage includes all of Europe, North Africa and the Middle East. Galileo is the European Union's global satellite navigation system that is interoperable with and complementary to GPS. It will have 30 satellites in three orbital planes providing four navigation services including open access and commercial services. Galileo signals will have better performance than other satellite systems with three frequency bands and compatibility with other satellite systems.

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88 views14 pages

Aircraft Navigation and Flight Computers: Galileo

EGNOS is Europe's Satellite-Based Augmentation System that improves the accuracy of GPS signals for civilian use in Europe. It works by transmitting differential corrections to GPS signals from geostationary satellites. EGNOS improves the accuracy of GPS from around 5 meters to between 1-5 meters. EGNOS coverage includes all of Europe, North Africa and the Middle East. Galileo is the European Union's global satellite navigation system that is interoperable with and complementary to GPS. It will have 30 satellites in three orbital planes providing four navigation services including open access and commercial services. Galileo signals will have better performance than other satellite systems with three frequency bands and compatibility with other satellite systems.

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Alvin T'ng
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© Attribution Non-Commercial (BY-NC)
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AE 4003 AIRCRAFT NAVIGATION AND FLIGHT COMPUTERS

By Frederik Blumrich

Lecture Topic: Galileo

What is EGNOS?
Satellite-Based Augmentation System (SBAS) for Europe
European Geostationary Navigation Overlay Service (EGNOS)
GEO

G P S -lik e s ig n a ls

D iffe re n tia l c o rre c tio n s

In te g rity (U s e / D o n 't U s e )

+ ACCURACY + A V A IL A B IL IT Y + C O N T IN U IT Y

+ SAFETY

Position accuracy

GPS

GPS + EGNOS

GPS + EGNOS + GALILEO

EGNOS coverage

Accuracy : depending on the conditions, 1 to 5m standard performance Most ranges of receivers have currently EGNOS enabled products

GALILEO
First concepts in 1999, Galileo programme started 2003 Currently being built by the European Union (EU) and European Space Agency (ESA)
Four navigation services and one Search and Rescue service Six different navigation signals Three carrier frequencies Better performance than other satellite navigation systems Compatibility and interoperability with other satellite navigation systems

Galileo Services
Open Access
Free of charge, free to air, Mass market, Simple positioning Encrypted, High accuracy, Guaranteed service Integrity, Authentication of signal (Aviation) Near real-time, Precise, Return link feasible (Maritime) Encrypted, Integrity, Continuous availability (Administrations, security, military)

Commercial

Safety of Life Search and Rescue Public Regulated

Final Space Segment

Walker 27/3/1 +3 Active Spares Inclination 56 29600.318 km Radii Period 14hr 4m 42s Ground Track Repeat 10 days /17 Orbits Clocks: 2 Rubidium, 2 Passive Hydrogen Maser (PHM)

Image: ESA

GIOVE A Satellite Details

Stowed Dimensions
1.31.741.65m 450 kg 660 W 2 Rubidium Clocks

Lift-Off-Mass Power Demand Timing Source


Propulsion Bay

Broadcast
2 transmission channels in parallel

GIOVE A First Galileo Lauch


Successful Launch 28th Dec 2005 Soyuz 4-Stage Launch Vehicle L1, E5A & E5B Signals Transmitted & Received 12th January 2006 E6 Signal Transmitted & Received 14th January 2006

GIOVE B Satellite Details

Stowed Dimensions
0.9550.9552.4m 523 kg 943 W

Lift-Off-Mass Power Demand Timing Source


2 Rubidium, 1 Passive Hydrogen Maser Clock 3 transmission channels in parallel

Broadcast

FOC Ground Sensor Stations

Galileo system architecture

Galileo Signals & Frequencies


Each satellite transmits 6 navigational signals over 4 carrier frequencies The Signals are:
L1F Signal - OS, unencrypted L1P Signal PRS, encrypted E6C Signal - Commercial Service, encrypted E6P Signal PRS, encrypted E5a OS, unencrypted E5b OS, unencrypted E5a (1176.450 Mhz) E5b (1207.140 Mhz) E6 (1278.75 Mhz) E2-L1-E1 (1575.42 Mhz) (same frequency as GPS L1)

The Carriers are:

Summary: GPS & Galileo


GPS
Maintained by Number of satellites Orbital planes Inclination Services SBAS Orbit altitude Orbital period Frequencies US Government 24 (21 + 3 spares) 6 (60 separated) 55

Galileo
EU and ESA 30 (27 + 3 spares) 3 (120 separated) 56

SPS, PPS (encrypted) OA, CS, SoL, SaR, PRS WAAS, EGNOS 20200km 11h 56m L1, L2 EGNOS 2322km 14h 4m 42s L1, E5a, E5b, E6

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