www.fugro.com© Fugro 2013

Precise Point Positioning with BeiDou

Ole ØrpenFugro Satellite Positioning AS

Geodesi- og HydrografidageneStavanger, 12-13 Nov. 2014

www.fugro.comJanuary 201325.04.2013

Contents

The G2 service

Galileo Testing 2013

BeiDou Testing 2014

Operational use of additional GNSS

Conclusions

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Fugro G2, GPS+GLONASS Service

• Orbit & clock Precise Point Positioning (PPP)

– Using more accurate orbits than broadcast ephemeris and very precise real-time satellite clock corrections

– Using carrier phase dual-frequency measurements to get decimeter accuracy

• Broadcast via Geostationary satellites

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G2 system overview

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G2 GPS + GLONASS Orbit/Clock Reference Stations and Broadcasts

www.fugro.com25.04.2013

Contents

The G2 service

Galileo Testing 2013

BeiDou Testing 2014

Operational use of additional GNSS

Conclusions

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Galileo, European Satellite Navigation System

Galileo System Testbed2 test satellites

In-Orbit Validation (IOV)4 satellites

Can be used for testing

Initial Operational Capability (IOC)8 satellites

2005/2008

2011/2014

2015 (?)

Full Operational Capability (FOC)24+2 satellites

2018

Full Galileo Constellation

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2020, 30 Satellites

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Fugro’s first Galileo Only Positioning, 18 March 2013

§ Four IOV satellites used in Precise Point Positioning (PPP) at 10 cm level

§ Fugro generated high accuracy Galileo orbit/clock data using Fugro’s tracking network

Fugro tracking network, yellow means Galileo capable stations

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Fugro’s first Galileo Only Positioning, 18 March 2013

And this was acknowledged by ESA

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www.fugro.com25.04.2013

Contents

The G2 service

Galileo Testing 2013

BeiDou Testing 2014

Operational use of additional GNSS

Conclusions

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BeiDou, Chinese Satellite Navigation System

• Regional Asia coverage 2013– 4 MEO (Medium Earth Orbit)– 5 GEO (Geostationary Orbit)– 5 IGSO (Inclined Geostationary Orbit)

• Full world wide Coverage 2020• 30 MEO: 21500 km• 6 GEO/IGSO: 35786 km

http://www.oosa.unvienna.org/oosa/en/SAP/gnss/icg/icg06/sixth-icg-meeting_-online-presentations.html/ 11 /

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GPS, GLONASS and BeiDou in Perth

30 Aug 2013, 14:30 UTC

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In the Far East, including BeiDou, typically 25 satellites are available at any time

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BeiDou only in Chiwan, 4 hours, no GEOs

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• Convergence with GPS/GLON• No Geostationary BeiDou Sat• Not 24 hour coverage with BeiDou only• At Fugro G4 introduction, no GEO

satellites will be used

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BeiDou only in Perth, 24 hours, with GEOs

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• Convergence without GPS/GLON• With Geostationary BeiDou• 24 hour coverage with BeiDou only• In Fugro G4, GEO satellites will be

introduced later

www.fugro.com25.04.2013

Contents

The G2 service

Galileo Testing 2013

BeiDou Testing 2014

Operational use of additional GNSS

Conclusions

www.fugro.com

Obstructions

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In many applications obstructions is a problem. You miss out on satellites when you most

need them, e.g. operation using Dynamic Positioning close to an offshore installation.

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Dual Independent Delivery Paths

Network Control Centres in Perth and Houston utilise different satellite uplinks and different

broadcast communications satellites in each ocean region to ensure link independence.

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Advantage of additional GNSS today

Today and in the short term additional GNSS satellites are used in a combined solution, with improved:

• Availability– Combined systems improve availability of

satellite navigation in situations where parts of the sky are obscured (Shadowing, Scintillations).

• Reliability, Accuracy– Additional lines of position help to identify

bad measurements (RAIM, Receiver Autonomous Integrity Monitoring) and improve satellite geometry. (Also improved spoofing detection)

Lines of Position used in RAIM

Outlier

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GPS World Magazine March 2010

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Advantage of additional GNSS in the future

In the future when additional GNSS become available, they can be combined into two independent setups both with high reliability/availability:

– Each setup has enough satellites to provide reliable position with high availability– Errors in one GNSS does not affect both setups– Errors in corrections for one GNSS does not affect both setups– Will provide increasingly better performance as BeiDou and Galileo become fully

operational

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Possible configuration:

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Fugro G2 – More is Better

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Fugro G4 – Even More is Even Better

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www.fugro.com25.04.2013

Contents

The G2 service

Galileo Testing 2013

BeiDou Testing 2014

Operational use of additional GNSS

Conclusions

www.fugro.com

Summary

§ Chinas' BeiDou has 14 satellites in orbit§ Europe’s Galileo GNSS System has 4 satellites in orbit

§ Fugro G2 GPS/GLONASS orbit/clock decimeter level system being extended to other GNSS’s– First Fugro Galileo only Decimeter level positioning March 2013– First Fugro BeiDou only decimeter level positioning August 2014

§ Additional GNSS satellites provides opportunity for improved performance– Improved availability, reliability and accuracy in combined systems– Independent services

• E.g. GPS+BeiDou and GLONASS+Galileo

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Fugro will Launch G4 Service with BeiDou early 2015

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And suddenly Galileo will be there……..

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GPS, GLONASS, Galileo and BeiDou in Oslo

Have a look at: http://128.39.56.21/

www.fugro.com© Fugro 2013

Thank You

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Galileo launch injection anomaly, Aug 22 2014

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• Upper stage of the Soyuz launch system did not work properly

• Inclination 49.8º (55), Ecc.: 0.23 (0)• 13700/25900 km above ground

• Crosses GPS/GLONASS orb.• In Van Allan Radiation belt

• Hydrazine and (cold) Helium pipes too close, Hydrazine pipe froze.

• The satellites have by far not enough Hydrazine fuel to reach correct orbit.

• Will Increase lowest orbit point

• Next launch in December will be delayed to February

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Galileo launch injection anomaly, Aug 22 2014

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Galileo launch injection anomaly, Aug 22 2014

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