status of compass development - stanford university

Status of Compass Development

Mingquan LU

Tsinghua University

Presented by Grace Xingxin GAO Stanford University

2010.11.09

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Outline

System Overview Development Status

Applications International Cooperation

Conclusions & Challenges

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Outline




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Space Segment Phases

Phase I (by 2003)

Beidou I

Phase II (by 2012)

Beidou II

Phase III (by 2020)

Beidou II/ Compass

3 GEO

Regional positioning

Short text messages

5 GEO

5 IGSO 4 MEO

Regional positioning

Short text messages

5 GEO

3 IGSO 27 MEO

Global positioning

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Ground Segment

1 Master control station

2 Uplink stations

30 Monitor stations

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Beidou Signals

Phase I

Satellite -> User: S band

User -> Satellite: L band

Phase II

3 frequencies, 5 signals

Phase III

3 frequencies, 10 signals

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Signal Characteristics

PHASE II (deploying)

Component Carrier

(MHz)

Chip Rate

(Mcps)

Bandwidth

(MHz)Modulation Service

B1(I) 1561.098

2.046 4.092

BPSK Open

B1(Q) 2.046 BPSK Authorized

B2(I) 1207.14

2.046 24

BPSK Open

B2(Q) 10.23 BPSK Authorized

B3 1268.52 10.23 24 QPSK Authorized

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Signal Characteristics

PHASE III (planned) Component

Carrier

(MHz)

Chip rate

(Mcps)

Data/Symbol

rate (bps/sps) Modulation Service

B1-CD

1575.42

1.023 50/100 MBOC(6,1,1/11

) Open

B1-CP No

B1 2.046 50/100

BOC（14，2） Authorized No

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-AD 2.5575

50/100 BOC(15,2.5) Authorized

B3-AP No

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Signal Spectra

B1

(1575.42MHz)

B2

(1191.795MHz)

B3

(1268.52MHz)

Open Service

Authorized Service

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Services and Performances

Global Services Open Service

Positioning: 10 m Timing: 20 ns Velocity: 0.2 m/s

Authorized Service

Regional Services

Wide area differential service

Positioning: 1 m

Short Text Messages (STM)

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Time and Coordinate System

Time System Beidou Time (BDT) is aligned to UTC.

Coordinate System China Geodetic Coordinate System 2000 (CGCS2000)

Consistent with International Terrestrial Reference System (ITRS).

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Outline




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Satellite Launch Plan

Date Satellite Launch

Center

Launch

Carrier

Launch

Cabin

2007.04.14 MEO Xichang CZ-3A DFH-3

2009.04.15 GEO Xichang CZ-3C DFH-3



2010.08.01 IGSO Xichang CZ-3A DFH-3

2010.11.01 GEO Xichang CZ-3A DFH-3

2010.12(?) IGSO Xichang CZ-3A DFH-3

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In-orbit Verification - Clock

Rubidium atomic clock

Stability:

5e-14 sec/day

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In-orbit Verification

Orbit determination precision: < 10 m

Time synchronization precision: < 2ns

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In-orbit Verification

Signal Spectra (B1, B2, B3)

B1 B2

B3

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Beidou Terminal Products

Beidou-1 terminals (1st generation, 2003)

General purpose ICs (FPGA, DSP, etc) based.

Full RDSS function (positioning, timing and STM)

terminal). Communication (STM only) terminal. Timing module.

Beidou-1 handsetBeidou-1 timing module

(52mmx26mm

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Beidou Terminal Products

Beidou-1 terminals (2nd generation, 2009)

ASIC (RF IC, BB IC, etc) based. Beidou-1 terminal. Beidou/GPS combined terminal. … …

2nd gen. Beidou-1 handset

(antenna opened)

2nd gen. Beidou-1 handset

(with Nokia N97)

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Outline




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Some Successful Applications

60,000+ registered users

A large number of non-registered users Passive timing, positioning, etc

Main successful applications in China Fishery

Transportation

Water conservancy

Meteorology

Forest Fire Prevention

Soil Monitoring

Disaster Prevention and Mitigation

Timing

… …

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Fishery

Since 2007, more than 14,000 fishing users. Fishery management services

Fishing boat services STM services for fishing boat emergency alarms Vessel cross-border warnings, etc.

Marine fishery applications in China Beidou-based fishery information service

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Water Conservancy

Beidou based hydrologic monitoring system

More than 4,000 users The Yangzi river valley The Yellow river basin Barrier lake during the Wenchuan earthquake

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Disaster Prevention and Mitigation

Improving rescue response and decision making capability Rapid and timely disaster forecast warning report Rescue command scheduling

Rapid emergency communication (STM)

During the earthquakes in Wenchuan, Sichuan Province and Yushu, Qinghai

Province, Beidou terminals sent out the disaster and rescue information at the first

time.

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Timing

Devices: Beidou/GPS dual-mode time synchronization equipment, embedded Beidou/GPS timing module.

Timing tests: CDMA networks in 7 provinces.

Successful trials: more than 200 sets of base station equipment.

Time synchronization accuracy: < 100ns. Locations of timing tests

BD-1/GPS timing equipment for CDMA

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Outline




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Frequency Coordination

Table of Frequency Coordination meetings

Beidou & GPS

Sequence Time Location

1 Jun 2007 Geneva, Switzerland

2 May 2008 Xi’an, China

3 Oct 2008 Geneva, Switzerland

4 Dec 2009 Sanya, China

5 Sep 2010 Chengdu, China

Beidou & Galileo 1 May 2007 Beijing, China

2 Jan 2010 Beijing, China

Beidou & GLONASS 1 Jan 2007 Moscow，Russia

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Technical Working Group on Compatibility and Interoperability

Table of Technical Working Group meetings on Compatibility and Interoperability

Beidou

&

Galileo

Sequence Time Location

1 Sep 2008 Beijing, China

2 Dec 2008 Beijing, China

3 Jun 2009 Brussels, Belgium

4 Jan 2010 Beijing, China

5 Oct 2010 Brussels, Belgium

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The 1st China Satellite Navigation Conference (CSNC’2010), Conference + 2 Workshops

CSNC’2010, China National Conference Center, Beijing, May 19~21, 2010

1000+ people, 400+ papers

Dozens of companies, several academic institutes

CSNC’2011 will be held in Shanghai, May 18-20, 2011

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Two GNSS Workshops

Workshop on Beidou/GNSS Applications, May 21, 2010, Peking University, Beijing.

Workshop on GNSS Compatibility and Interoperability, May 21, 2010, Tsinghua University, Beijing.

Workshop on GNSS Compatibility and Interoperability, Tsinghua

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Outline




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Conclusion

Regional PNT and STM by 2012 Global PNT service by 2020. Highly emphasize on international cooperation and academic exchange. Beidou for China, Beidou for the world.

Challenges & future work Signal design for compatibility and interoperability with limited frequency resources Stable, reliable, long-lasting, small-size atomic clocks Global monitoring system, especially monitors overseas Smooth transition from Phase II to Phase III Consumer market adoption

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Major Beidou Websites

Beidou (Compass) Navigation Satellite System

www.beidou.gov.cn or www.compass.gov.cn

China Satellite Navigation Conference

www.beidou.org

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Thank you for Your Attention!

Professor Mingquan LU, PhD

[email protected]

status of compass development - stanford university

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