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COMPASS Satellite Navigation System Development

Nov. 26th-28th, 2008, Beijing

China Satellite Navigation Project Center

SIDEREUS 2008

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Contents

1.Basic principles of the State Policy

2.System General Description

3.System Deployment

4.Applications

5.International Cooperation

6.Summary

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Contents

1.Basic principles of the State Policy

2.System General Description

3.System Deployment

4.Applications

5.International Cooperation

6. Summary

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China decided to build an independent satellite navigation system in 1980’s. In 2003, the COMPASS navigation demonstration system was built and after that, the system has been used in many areas. Now the COMPASS global navigation system is under construction.

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principles of the State Policy

Openness COMPASS will provide high quality public services free of direct user charge, and we encourage COMPASS use all over the world. China will communicate with other countries widely and deeply in the field of satellite navigation to promote compatibility and interoperability among GNSS, and push the advancement of world satellite navigation technology and industry.

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Independency

China will develop and operate COMPASS independently. COMPASS can provide services for users independently and higher quality services in Asia-Pacific region.

principles of the State Policy

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Compatibility COMPASS will pursue solutions to realize compatibility and interoperability with other satellite navigation systems in the framework of ICG and ITU, and users can get better services with interoperable receivers. Based on the protection of current users and industry, all users will enjoy the improvement of COMPASS navigation satellite system.

principles of the State Policy

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Gradualness To control the technical and economic risks, COMPASS will be developed step by step based on technology and economy level of China. And COMPASS will provide long-term continuous services for users, and incessantly improve system performance to realize seamless link and smooth transition of every phase.

principles of the State Policy

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Contents

1.Basic principles of the State Policy

2.System General Description

3.System Deployment

4.Applications

5.International Cooperation

6. Summary

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Space Segment

5 GSO satellites and Not more than 30 MEO satellites

Constellation

GSO Satellite

MEO Satellite

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Ground Segment

The ground segment consists of Master Control

Station, Upload Stations and Monitor Stations.

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User Segment

The user segment consists of COMPASS user terminals and interoperable terminals.

User terminals of COMPASS system

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frequencies & signals

Frequencies

B1,B1-2, B2, B3, B1-BOC, L5Signals: B1(QPSK), B1-MBOC(6,1,1/11) , B1-2 (QPSK), B2(QPSK), B2-BOC(10,5 ) ,B3(QPSK), B3BOC(15,2.5), L5 (QPSK).

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Services

Two kinds of global services

Open Service ： free and open to users

• Positioning Accuracy: 10 m

• Timing Accuracy: 20 ns

• Velocity Accuracy: 0.2 m/s

Authorized Service: ensure highly reliable use even in complex situation.

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Services

Two kinds of regional services

Wide area differential service：• Positioning accuracy: 1 m

short message service.

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Contents

1.Basic principles of the State Policy

2.System General Description

3.System Deployment

4.Applications

5.International Cooperation

6. Summary

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COMPASS Navigation Demonstration System.

After 3 GEO satellites launched since 2000, the demonstration system can provide basic services including positioning, timing and short-message telecommunication.

The 1st Step

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COMPASS Navigation satellite system.

As a global system COMPASS will cover Asia-Pacific area

firstly about 2010.

2010 The near future

The 2nd step

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After extensive experiments, the technical configuration of COMPASS has been determined. Launched in Apr. 2007, the first MEO satellite of COMPASS is for system IOV and secures the frequency filings. The ground segment is ready, and constellation deployment is in the schedule.

COMPASS-M1 Experimentation

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Experiment result

Orbit determination precision: about 5 meter

Orbit prediction precision: about 10 meter (24 hours).

Time synchronization precision: about 2ns.

Clock prediction maximum errors: <20ns (24 hours).

Compatible Positioning errors ( with GPS) : 10meter (95%).

COMPASS-M1 Experimentation

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Launches

2010 2011

……

2009

Planed launches in recent two years

10 rockets of Long-March3 will be launched in recent two years,

more than 10 satellites will be put into use, after that the system can

offer services regionally.

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Contents

1.Basic principles of the State Policy

2.System General Description

3.System Deployment

4.Applications

5.International Cooperation

6. Summary

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The COMPASS Navigation Test System has played an important

role in many areas.

- telecommunications,

- transportation,

- meteorology,

- forest fire prevention,

- disaster forecast,

- Marine.

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Disaster Control

Daxinganling Forest Fire Prevention Command System

2006年黑龙江大兴安岭火灾2006年黑龙江大兴安岭火灾

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Disaster Control

Emergency Position &Information Services in Sichuan Earthquake

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Marine Application

Offshore Tide Monitor Data Transmission

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Marine Application

Offshore Fishing Ship Control System

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Marine Search and rescue

Marine Application

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Transportation Application

Qinghai-Tibet Plateau Railway Monitor and Control System

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Transportation Application

Dangerous –Truck Trace and Control System

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Offshore and Inland Water Transport Control System

Transportation Application

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Space Application

Space Terminals for Tele-control

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Contents

1.Basic principles of the State Policy

2.System General Description

3.System Deployment

4.Applications

5.International Cooperation

6. Summary

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Focus on:

-Compatibility of frequency

-Interoperability with multi-systems in sense of signals,

geodesy reference and time reference

-Development of common standards for GNSS application

-GNSS receiver test and certification

-Future navigation technology development

-Search and rescue service implementation on GNSS

-Integrity monitoring

Cooperation

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Contents

1.Basic principles of the State Policy

2.System General Description

3.System Deployment

4.Applications

5.International Cooperation

6. Summary

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The development of COMPASS is a national strategy of China.

COMPASS is an essential element of the international GNSS.

COMPASS is being constructed efficiently and smoothly.

China encourages international cooperation to ensure compatibility and interoperability with other systems.

Summary

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Thanks for your attention!