1、Mar.9th-11th,2010,MunichChina Satellite Navigation OfficeMunich Satellite Navigation Summit 20101BeiDou(COMPASS)Navigation Satellite System DevelopmentuThe governmental website of BeiDou Satellite Navigation System was launched on Jan.15,2010.u“”or“”.uThe English version will be online soon.21.Basic
2、 principles2.System General Description3.System Deployment 4.Applications5.Compatibility and Interoperability6.Conclusion3Contents1.Basic principles2.System General Description3.System Deployment 4.Applications5.Compatibility and Interoperability6.ConclusionsContents4 China determined to develop an
3、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.5OpennessIndependencyCompatibilityGradualness Basic Principles6 Basic Principle
4、s7uOpenness 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.B
5、asic Principles8uIndependency 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 Principles9uCompatibility BeiDou will pursue solutions to realize compat
6、ibility and interoperability with other satellite navigation systems.Basic Principles10uGradualness 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 performan
7、ce and ensure smooth transition during all life cycle.1.Basic principles2.System General Description3.System Deployment 4.Applications5.Compatibility and Interoperability6.ConclusionsContents11System Description12System StructureSignal CharacteristicsTime SystemCoordinate SystemServices and Performa
8、nces System StructureConstellationGEO SatelliteMEO SatelliteuSpace Segment5 GEO satellites and 30 Non-GEO satellites13 The ground segment consists of Master Control Station,Upload Stations and Monitor Stations.System StructureuGround Segment14 The user segment consists of BeiDou user terminals and i
9、nteroperable terminals with other GNSS.User terminals of BeiDou systemuUser SegmentSystem Structure15uUser SegmentSystem structure16 The development of user terminals is making progress steadily and related policies and standards are being studied and developed.The technical preparation for publishi
10、ng 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 System.Signal CharacteristicsuFrequencies B1:1559.0521591.788MHz B2:1166.221217.37MHz B3:1250.6181286.423MHz17Till the yearConstellationSignals(actual emission)
11、20125GEO+5IGSO+4MEO（Regional Service）mainly COMPASS Phase(CP)II signals20205GEO+3IGSO+27MEO（Global Service）mainly CP III signalsuCP II:B1,B2,and B3 as belowSignal Characteristics18ComponentCarrier Frequency(MHz)Chip Rate(cps)Bandwidth(MHz)Modulation TypeServiceTypeB1(I)1561.0982.0464.092QPSKOpen B1(
12、Q)2.046AuthorizedB2(I)1207.142.04624QPSKOpen B2(Q)10.23AuthorizedB31268.5210.2324QPSKAuthorized 19uCP III:B1,B2 and B3 as belowComponentCarrier Frequency(MHz)Chip Rate(cps)Data/Symbol Rate(bps/sps)ModulationTypeServiceTypeB1-CD1575.421.02350/100MBOC(6,1,1/11)Open B1-CPNoB1-A2.04650/100BOC（14，2）Autho
13、rizedNoB2aD1191.79510.2325/50AltBOC(15,10)Open B2aPNoB2bD50/100B2bPNoB31268.5210.23500bpsQPSK(10)AuthorizedB3-AD2.557550/100BOC(15,2.5)AuthorizedB3-APNoTime System20uBeiDou time is named as BDT,traced to UTC,and synchronized with UTC within 100ns.The epoch time of BDT is UTC 00d 2006.uInteroperabili
14、ty 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.uBeiDou uses China Geodetic System 2000(CGS2000)uCoinciding with ITRF at a few cm level,and for most applications the difference between CGS2000 and I
15、TRF can be ignored.Coordinate System21Services and PerformancesuTwo kinds of global services n Open Service：free and open to users Positioning Accuracy:10 m Timing Accuracy:20 ns Velocity Accuracy:0.2 m/sn Authorized Service:ensure high reliable use even in complex situation.22Services and Performan
16、cesuTwo kinds of regional servicesn Wide area differential service Positioning accuracy:1 mn short message service23Contents1.Basic principles2.System General Description3.System Deployment 4.Applications5.Compatibility and Interoperability6.Conclusion24Deployment Stepu1st StepDemonstration System C
17、OMPASS Phase I(CP I)25 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 31,2000140EDec 21,200080EMay 25,2
18、003110.5E BeiDou will cover Asia-Pacific area around 2012,and will cover all over the world before 2020.COMPASS Phase II(CP II)Around 2012Deployment Stepu2nd StepGlobal System26COMPASS Phase III(CP III)Before 2020 The first MEO satellite named COMPASS-M1 was launched in Apr.2007 which secured the IT
19、U related filing.Many technical experimentations have been implemented using COMPASS-M1.COMPASS-M1 Launch27COMPASS-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 rela
20、ted technologies have been verified using the satellite.28GEO 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.29uOn Jan.22,the satellite was locate
21、d at 160E and started transmitting signals.u Now the satellite is in-orbit test.30Launch Schedule31More than 10 satellites will be put in orbit and the system will provide regional service before the end of 2012.Contents1.Basic principles of the State Policy2.System General Description3.System Deplo
22、yment 4.Applications5.Compatibility and Interoperability6.Conclusion32Applications33uBeiDou 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.Conte
23、nts1.Basic principles of the State Policy2.System General Description3.System Deployment 4.Applications5.Compatibility and Interoperability6.Conclusion34Views on Compatibility and InteroperabilityRelated Bilateral ActivitiesCompatibility and Interoperability35uCompatibility:the ability of multiple s
24、atellite navigation system to be used separately or together,without causing harmful interference with use of each individual service or signal.uInternational Telecommunication Union provides a framework for discussion on radiofrequency compatibility.36Compatibilityu Spectrum overlap:There actually
25、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.37CompatibilitySpectrum
26、 separation of authorized service:uThe authorized service signal spectrum separation with open service signals is beneficial.uSignal design should consider many factors.uDue to the quite limit of frequency resources,authorized signal spectrum separation is very difficult at present.uIts very difficu
27、lt to satisfy the frequency resource requirements of modernization signals of existing systems and the signals of new systems to be built.38CompatibilityuInteroperability:the ability of open services of multiple satellite navigation system to be used together to provide better capabilities at the us
28、er level than would be achieved by relying solely on one service,without significantly increasing the complexity of receiver.39InteroperabilityuBenefit gained is larger than cost paid uProvide better capabilities at the user leveluBe easy for developing and manufacturing of interoperable receiversuB
29、roadcast interoperability information including the time differences between various System Time mutuallyuComparative max received power is beneficial for interoperabilityuCommon frequency spectrum is importantuFrequency diversity is beneficial for the improvement of anti-jamming capabilityuPossible
30、 interoperable signal suB1-C：1575.42MHzuB2a：1176.45MHzuB2b：1207.14MHz 40InteroperabilityRelated Bilateral ActivitiesuThe 1st Meeting was held in Geneva in June 2007.uThe 2nd Meeting was held in Xian in May 2008.uThe 3rd Meeting was held in Geneva in Oct 2008.uThe 4th Meeting was held in Sanya in Dec
31、 2009.Four meetings on frequency compatibility coordination:41u The 1st frequency compatibility coordination meeting was held in Beijing in May 2007.u The 1st Technical Working Group meeting on Compatibility and Interoperability was held in Beijing in Sep 2008.u The 2nd TWG meeting was held in Beiji
32、ng in Dec 2008.u The 3rd TWG meeting was held in Brussels in Jun 2009.u The 2nd frequency compatibility coordination meeting was held in Beijing in Jan 2010.u The 4th TWG meeting was held in Beijing in Jan 2010.Related Bilateral Activities42uThe frequency compatibility coordination meeting was held
33、in Moscow in Jan 2007.Related Bilateral Activities43Contents1.Basic principles of the State Policy2.System General Description3.System Deployment 4.Applications5.Compatibility and Interoperability6.Conclusion44uCurrently,BeiDou is developing as planned.uAs an important GNSS,BeiDou seeks win-win development with other systems through active cooperation and mutual benefits.Conclusion45Thanks for your attention!46
