Mar. 9th-11th, 2010, MunichChina Satellite Navigation Office

Munich Satellite Navigation Summit 2010

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BeiDou (COMPASS) Navigation Satellite System Development

The governmental website of BeiDou Satellite Navigation System was launched on Jan. 15, 2010.

“www.beidou.gov.cn” or “www.compass.gov.cn”.

The English version will be online soon.

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1. Basic principles2. System General Description3. System Deployment 4. Applications5. Compatibility and

Interoperability6. Conclusion

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Contents

1. Basic principles2. System General Description3. System Deployment 4. Applications5. Compatibility and

Interoperability6. Conclusions

Contents

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China determined to develop an independent satellite navigation system in 1980s’. The BeiDou navigation demonstration system was completed in 2003, since then it has been used in many areas. Now the BeiDou navigation satellite system is under construction.

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OpennessIndependencyCompatibilityGradualness

Basic Principles

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Basic Principles

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Openness BeiDou will provide high quality open

services free of charge from direct users, and worldwide use of BeiDou is encouraged.

China will widely and thoroughly communicate with other countries on satellite navigation issues to facilitate the development of GNSS technologies and the industry.

Basic Principles

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Independency China will develop and operate BeiDou system independently, and BeiDou can independently provide services for global users and particularly provide high quality services in Asia-Pacific region .

Basic Principles

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Compatibility BeiDou will pursue solutions to realize compatibility and interoperability with other satellite navigation systems.

Basic Principles

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Gradualness The construction of BeiDou system follows a step-by-step pattern based on technical and economic evolution in China.

BeiDou will provide long-term continuous services for users, improve system performance and ensure smooth transition during all life cycle.

1. Basic principles2. System General Description3. System Deployment 4. Applications5. Compatibility and

Interoperability6. Conclusions

Contents

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System Description

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System StructureSignal CharacteristicsTime SystemCoordinate SystemServices and Performances

System Structure

Constellation

GEO Satellite

MEO Satellite

Space Segment5 GEO satellites and 30 Non-GEO satellites

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The ground segment consists of Master Control Station, Upload Stations and Monitor Stations.

System Structure

Ground Segment

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The user segment consists of BeiDou user terminals and interoperable terminals with other GNSS.

User terminals of BeiDou system

User Segment

System Structure

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User Segment

System structure

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The development of user terminals is making progress steadily and related policies and standards are being studied and developed. The technical preparation for publishing BeiDou SIS ICD (v1.0) has been finished, and the ICD as well as its update will be gradually released on the governmental website of BeiDou S ystem.

Signal Characteristics

Frequencies B1: 1559.052~1591.788MHz B2: 1166.22~1217.37MHz B3: 1250.618~1286.423MHz

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Till the year

Constellation Signals (actual emission)

2012 5GEO+5IGSO+4MEO（ Regional Service） mainly COMPASS Phase(CP) II

signals

2020 5GEO+3IGSO+27MEO（ Global Service） mainly CP III signals

CP II: B1, B2, and B3 as below

Signal Characteristics

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Component Carrier Frequency(MHz)

Chip Rate(cps)

Bandwidth(MHz)

Modulation Type

ServiceType

B1(I)1561.098

2.0464.092 QPSK

Open

B1(Q) 2.046 Authorized

B2(I)1207.14

2.04624 QPSK

Open

B2(Q) 10.23 Authorized

B3 1268.52 10.23 24 QPSK Authorized

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CP III: B1, B2 and B3 as belowComponent Carrier Frequency

(MHz) Chip Rate

(cps) Data/Symbol

Rate (bps/sps) Modulation

TypeServiceType

B1-CD

1575.42

1.02350/100

MBOC(6,1,1/11) Open B1-CP No

B1-A 2.04650/100 BOC （ 14 ， 2） AuthorizedNo

B2aD

1191.795 10.23

25/50

AltBOC(15,10 ) Open B2aP No

B2bD 50/100

B2bP No

B3

1268.52

10.23 500bps QPSK(10) Authorized

B3-AD2.5575

50/100BOC(15,2.5) Authorized

B3-AP No

Time System

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BeiDou time is named as BDT, traced to UTC, and synchronized with UTC within 100ns. The epoch time of BDT is UTC 00d 2006.

Interoperability of BDT with GPS/Galileo time was considered in the design of BeiDou time system. The offset between BDT and GPST/ GST will be measured and broadcast.

BeiDou uses China Geodetic System 2000 (CGS2000)

Coinciding with ITRF at a few cm level, and for most applications the difference between CGS2000 and ITRF can be ignored.

Coordinate System

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Services and Performances

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 high reliable use even in complex situation.

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Services and Performances

Two kinds of regional services

Wide area differential service

• Positioning accuracy: 1 m

short message service

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Contents

1.Basic principles2.System General Description3.System Deployment 4.Applications5. Compatibility and

Interoperability6.Conclusion

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Deployment Step

1st Step—Demonstration System COMPASS Phase I (CP I)

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After 3 GEO satellites being launched since 2000, the demonstration system is able to provide basic services including positioning, timing and short-message communication in regional area. Currently, all the 3 satellites work normally in orbit.

Oct 31,2000140E

Dec 21,200080E

May 25 ,2003110.5E

BeiDou will cover Asia-Pacific area around 2012, and will cover all over the world before 2020.

COMPASS Phase II (CP II)

Around 2012

Deployment Step

2nd Step—Global System

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COMPASS Phase III (CP III)

Before 2020

The first MEO satellite named COMPASS-M1 was launched in Apr. 2007 which secured the ITU related filing. Many technical experimentations have been implemented using COMPASS-M1.

COMPASS-M1 Launch

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COMPASS-G2 Launch

The first GEO satellite named COMPASS-G2 was launched by a Long March-3C carrier rocket at the Xichang Satellite Launch Center on Apr.15 2009. The GEO navigation satellite related technologies have been verified using the satellite.

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GEO Satellite Launch Latterly

The 3rd satellite of BeiDou was launched by a Long March-3C carrier rocket from the Xichang Satellite Launch Center on Jan.17 2010. The satellite is also the 2nd GEO satellite.

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On Jan. 22, the satellite was located at 160°E and started transmitting signals.

Now the satellite is in-orbit test.

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Launch Schedule

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More than 10 satellites will be put in orbit and

the system will provide regional service before

the end of 2012.

Contents

1.Basic principles of the State Policy

2.System General Description3.System Deployment 4.Applications5.Compatibility and

Interoperability6.Conclusion

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Applications

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BeiDou Navigation Demonstration System has played important roles in various areas.

- Surveying and mapping- Communication- Water conservancy- Disaster mitigation- Marine- Transportation- Mining- Forest fire rescue- etc.

Contents

1.Basic principles of the State Policy

2.System General Description3.System Deployment 4.Applications5.Compatibility and Interoperability6.Conclusion

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Views on Compatibility and Interoperability

Related Bilateral Activities

Compatibility and Interoperability

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Compatibility: the ability of multiple satellite navigation system to be used separately or together, without causing harmful interference with use of each individual service or signal.

International Telecommunication Union provides a framework for discussion on radiofrequency compatibility.

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Compatibility

Spectrum overlap:There actually exist some cases of frequency

overlap between signals of different systems and it is feasible for navigation systems to share the same frequency spectrum.

The frequency spectrum overlap of open signals is beneficial for the realization of interoperability for many applications.

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Compatibility

Spectrum separation of authorized service : The authorized service signal spectrum separation

with open service signals is beneficial. Signal design should consider many factors. Due to the quite limit of frequency resources,

authorized signal spectrum separation is very difficult at present.

It’s very difficult to satisfy the frequency resource requirements of modernization signals of existing systems and the signals of new systems to be built.

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Compatibility

Interoperability: the ability of open services of multiple satellite navigation system to be used together to provide better capabilities at the user level than would be achieved by relying solely on one service, without significantly increasing the complexity of receiver.

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Interoperability

Benefit gained is larger than cost paid

Provide better capabilities at the user level

Be easy for developing and manufacturing of interoperable receivers

Broadcast interoperability information including the time differences between various System Time mutually

Comparative max received power is beneficial for interoperability

Common frequency spectrum is important

Frequency diversity is beneficial for the improvement of anti-jamming capability

Possible interoperable signal s B1-C ： 1575.42MHz B2a ： 1176.45MHz B2b ： 1207.14MHz 40

Interoperability

Related Bilateral Activities

BeiDouBeiDou GPSGPS

The 1st Meeting was held in Geneva in June 2007.

The 2nd Meeting was held in Xi’an in May 2008.

The 3rd Meeting was held in Geneva in Oct 2008.

The 4th Meeting was held in Sanya in Dec 2009.

Four meetings on frequency compatibility coordination :

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The 1st frequency compatibility coordination meeting was held in Beijing in May 2007.

The 1st Technical Working Group meeting on Compatibility and Interoperability was held in Beijing in Sep 2008.

The 2nd TWG meeting was held in Beijing in Dec 2008.

The 3rd TWG meeting was held in Brussels in Jun 2009.

The 2nd frequency compatibility coordination meeting was held in Beijing in Jan 2010.

The 4th TWG meeting was held in Beijing in Jan 2010.

GalileoGalileo

Related Bilateral Activities

BeiDou BeiDou

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The frequency compatibility coordination meeting was held in Moscow in Jan 2007.

GLONASSGLONASSBeiDou BeiDou

Related Bilateral Activities

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Contents

1.Basic principles of the State Policy

2.System General Description3.System Deployment 4.Applications5.Compatibility and Interoperability6.Conclusion

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Currently, BeiDou is developing as planned.

As an important GNSS, BeiDou seeks win-win development with other systems through active cooperation and mutual benefits.

Conclusion

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Thanks for your attention!

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