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Mar. 9 th -11 th , 2010, Munich. Munich Satellite Navigation Summit 2010. BeiDou (COMPASS) Navigation Satellite System Development. China Satellite Navigation Office. 1. The government al website of BeiDou S atellite N avigation S ystem was launched on Jan. 15, 2010.

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mar 9 th 11 th 2010 munich
Mar. 9th-11th, 2010, Munich

Munich Satellite Navigation Summit 2010

BeiDou (COMPASS) Navigation Satellite System Development

China Satellite Navigation Office

1

slide2
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 versionwill be onlinesoon.

2

slide3

Contents

1. Basic principles

2. System General Description

3. System Deployment

4. Applications

5. Compatibility and Interoperability

6. Conclusion

3

slide4

Contents

1. Basic principles

2. System General Description

3. System Deployment

4. Applications

5. Compatibility and Interoperability

6. Conclusions

4

slide5

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.

5

slide6

Basic Principles

  • Openness
  • Independency
  • Compatibility
  • Gradualness

6

slide7

Basic Principles

  • 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.

7

slide8

Basic Principles

  • 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 .

8

slide9

Basic Principles

  • Compatibility

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

9

slide10

Basic Principles

  • 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.

10

slide11

Contents

1. Basic principles

2. System General Description

3. System Deployment

4. Applications

5. Compatibility and Interoperability

6. Conclusions

11

system description
System Description
  • System Structure
  • Signal Characteristics
  • Time System
  • Coordinate System
  • Services and Performances

12

system structure
System Structure
  • Space Segment

5 GEO satellites and 30 Non-GEO satellites

GEO Satellite

MEO Satellite

Constellation

13

system structure14

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

System Structure
  • Ground Segment

14

slide15

System Structure

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

  • User Segment

User terminals of BeiDou system

15

slide16

System structure

  • User Segment

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 updatewill be gradually released on the governmental website of BeiDou System.

16

slide17

Signal Characteristics

  • Frequencies

B1: 1559.052~1591.788MHz

B2: 1166.22~1217.37MHz

B3: 1250.618~1286.423MHz

17

slide18

Signal Characteristics

  • CP II: B1, B2, and B3 as below

18

slide20

Time System

  • 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.

20

slide21

Coordinate System

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.

21

slide22

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.

22

slide23

Services and Performances

  • Two kinds of regional services
        • Wide area differential service
      • Positioning accuracy: 1 m
        • short message service

23

contents
Contents

1.Basic principles

2.System General Description

3.System Deployment

4.Applications

5. Compatibility and Interoperability

6.Conclusion

24

slide25

Deployment Step

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

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 31,2000

140E

Dec 21,2000

80E

May 25 ,2003

110.5E

25

slide26

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

Deployment Step

  • 2nd Step—Global System

COMPASS Phase II (CP II)

Around 2012

COMPASS Phase III (CP III)

Before 2020

26

slide27

COMPASS-M1 Launch

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.

27

slide28

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.

28

slide29

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.

29

slide30
On Jan. 22, the satellite was located at 160°E and started transmitting signals.
  • Now the satellite is in-orbit test.

30

launch schedule
Launch Schedule
  • More than 10 satellites will be put in orbit and the system will provide regional service before the end of 2012.

31

contents32
Contents

1.Basic principles of the State Policy

2.System General Description

3.System Deployment

4.Applications

5.Compatibility and Interoperability

6.Conclusion

32

slide33

Applications

  • 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.

33

contents34
Contents

1.Basic principles of the State Policy

2.System General Description

3.System Deployment

4.Applications

5.Compatibility and Interoperability

6.Conclusion

34

slide36
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.

Compatibility

36

slide37
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.

Compatibility

37

slide38
Spectrum separation ofauthorized 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.

Compatibility

38

slide39
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.

Interoperability

39

slide40
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

Interoperability

40

related bilateral activities
RelatedBilateral Activities

BeiDou

GPS

Four meetings on frequencycompatibilitycoordination :

  • 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.

41

slide42

Related Bilateral Activities

BeiDou

Galileo

  • 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.

42

slide43

Related Bilateral Activities

GLONASS

BeiDou

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

43

contents44
Contents

1.Basic principles of the State Policy

2.System General Description

3.System Deployment

4.Applications

5.Compatibility and Interoperability

6.Conclusion

44

slide45

Conclusion

  • Currently, BeiDou is developing as planned.
  • As an important GNSS, BeiDouseeks win-win development with other systems through active cooperation and mutual benefits.

45

slide46

Thanks

for your attention!

46