Mar. 9th-11th, 2010, Munich,China Satellite Navigation Office,Munich Satellite Navigation Summit 2010,1,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.,2,1. Basic principles 2. System General Description 3. System Deployment 4. Applications 5. Compatibility and Interoperability 6. Conclusion,3,Contents,1. Basic principles 2. System General Description 3. System Deployment 4. Applications 5. Compatibility and Interoperability 6. Conclusions,Contents,4,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,Openness Independency Compatibility Gradualness,Basic Principles,6,Basic Principles,7,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,8,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,9,Compatibility BeiDou will pursue solutions to realize compatibility and interoperability with other satellite navigation systems.,Basic Principles,10,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 principles 2. System General Description 3. System Deployment 4. Applications 5. Compatibility and Interoperability 6. Conclusions,Contents,11,System Description,12,System Structure Signal Characteristics Time System Coordinate System Services and Performances,System Structure,Constellation,GEO Satellite,MEO Satellite,Space Segment,5 GEO satellites and 30 Non-GEO satellites,13,The ground segment consists of Master Control Station, Upload Stations and Monitor Stations.,System Structure,Ground Segment,14,The user segment consists of BeiDou user terminals and interoperable terminals with other GNSS.,User terminals of BeiDou system,User Segment,System Structure,15,User Segment,System structure,16,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 System.,Signal Characteristics,Frequencies B1: 1559.0521591.788MHz B2: 1166.221217.37MHz B3: 1250.6181286.423MHz,17,CP II: B1, B2, and B3 as below,Signal Characteristics,18,19,CP III: B1, B2 and B3 as below,Time System,20,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,21,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,Services and Performances,Two kinds of regional services Wide area differential service Positioning accuracy: 1 m short message service,23,Contents,1.Basic principles 2.System General Description 3.System Deployment 4.Applications 5. Compatibility and Interoperability 6.Conclusion,24,Deployment Step,1st StepDemonstration System COMPASS 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 31,2000 140E,Dec 21,2000 80E,May 25 ,2003 110.5E,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 StepGlobal System,26,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,27,COMPAS