Galileo:

System and Applications

Marco LisiEuropean Space Agency

Chief Technical Advisor of the European GNSS Agency(marco.lisi@esa.int)

Seminario Ordine degli IngegneriUniversità Tor Vergata, Roma, 23/11/17 4

The Principle of Satellite Navigation

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Position Depends on Time

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Four Equations in Four Unknowns

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“Ranging” & “Pseudo-Random Noise Code”

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Code Measurement

Il codice emesso dal satellite viene sovrapposto (correlazione) con quello generato internamente dal ricevitore:

Codice in arrivo dal satellite

Codice replica generato dal ricevitore

τ = ritardo misurato

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GNSS Multi-Constellation Scenario

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EGNOS: the European SBAS

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EGNOS Services

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EGNOS: a GPS Augmentation System

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EGNOS System Architecture

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Galileo Program Essentials

• Galileo is Europe's initiative for a state-of-the-artglobal navigation satellite system, providing ahighly accurate, guaranteed global positioningservice under civilian control;

• While providing autonomous navigation andpositioning services, Galileo will at the same timebe interoperable with GPS and GLONASS, the twoother global satellite navigation systems;

• The fully deployed Galileo system will consist of30 satellites (24 plus 6 spare) and the supportingground infrastructure.

Galileo System Architecture

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Galileo Services (Signals In Space)

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Galileo Constellation

Walker 24/3/1Semi-major Axis: 29,600 kmCircular OrbitInclination: 56°

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Galileo FOC Satellite

Launch Mass: 733 kgTotal Power: 1900 WSize: 2.5 x 1.2 x 1.1 m^3Solar Wing Span: 14.7 mDesign Lifetime: 12 years

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Galileo On-Board Atomic Clocks

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Galileo Ground Segment

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Galileo Centers

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Galileo Control Centers

2 Complementary Control Centres:

• Ground Mission Segment (GMS)in Fucino (Italy) has the responsibility for the mission aspects;

• Ground Control Segment (GCS)in Oberpfaffenhofen (Germany), to control and monitor the constellation.

Both centres are being completed to become fully redundant.

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Galileo Service Organization

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European GNSS Agency (GSA),Prague

Galileo Service Centre, Madrid

Galileo System Infrastructure

Galileo Security

Monitoring Centre

Galileo ILS Centre, Transinne

Galileo Reference Centre, Noordwijk

Galileo On-board Atomic Clock (Selex ES)

"Passive Hydrogen Maser" (PHM): 1 second every 3 milion years!

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Clocks Accuracy Evolution

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Galileo FOC Satellites (OHB)

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Galileo: a Constellation of Ultra Stable Clocks in the Sky

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Galileo: a worldwide UTC reference

UTC: UNIVERSAL TIME COORDINATED

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Why is exact Timing so important in Electric Power Grids?

Traditional Power Grid Architecture

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Future Power Grid Architecture

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Synchronized Phasor Measurements

• Synchronized near-real time measurements of voltage and current phasors at widely dispersed locations in an electric power grid are key to achieving an efficient power transmission and distribution and to preventing wide-scale cascading outages;

• A Phasor Measurement Unit (PMU), aka synchrophasor, is a device capable of measuring voltage and current phasors of the electrical waves in an electricity grid, using a common time source for synchronization;

• Measurements are time-stamped with 1 microsecond or better accuracy wrt a common absolute time reference provided by GNSS receivers integrated into the PMUs.

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Financial Networks

GNSS Timing and CriticalInfrastructures

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Unmanned Aerial Vehicles (UAVs) 1/2

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Unmanned Aerial Vehicles (UAVs) 2/2

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Autonomous Driving

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eCall and E112 adoption of EGNOS/Galileo

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My Vision: The Global SoS’s Infrastructure

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Earth Observation / IoTTelecomms

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