Current status of Quasi-Zenith Satellite System. Japan Aerospace Exploration Agency QZSS Project Team

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1 Current status of Quasi-Zenith Satellite System Japan Aerospace Exploration Agency QZSS Project Team 1

2 Quasi-Zenith Satellite System The QZSS is a regional space-based PNT (Positioning, Navigation and Timing) system covers East Asia and Oceania region and transmits six civil PNT signals; L1C/A, L1C on MHz, L2C on MHz and L5 on MHz L1-SAIF on MHz LEX on MHz can provide seamless PNT services by combining usage with GPS. Increasing coverage and availability of PNT services even in downtown and mountainous areas. can enhance GPS performance by transmitting error correction and integrity information. can accelerate Modernization of GPS in Asia Oceania region. can be a suitable platform for Multi-GNSS augmentation. First satellite will be launched in The 2nd and 3rd satellite will be approved after assessment of the technical demonstration result. 2

3 Quasi-Zenith Satellite System Three satellites are in elliptical and inclined GSO in different orbital planes to pass over the same ground track. a=42,164km e= i=39-47deg Ω= 120deg apart 3

4 Latitude (deg) 30 Quasi-Zenith Satellite System QZSS coverage and Visibility in Asia & Oceania Minimum Elevation Angle and Ground Track Longitude (deg) Ground Track of a QZSS Satellite At least one QZSS satellite can be observed more than specified elevation angle any time. For instance, users in orange colored area can receive at least one QZSS satellite with 70 degrees or more. 4

5 Quasi-Zenith Satellite System Coverage Average visible satellite number for QZSS (3 SV constellation) Southeast Asia can observe 3 QZSS satellites almost of time Most East Asia and Oceania countries can observe more than 2 QZSS satellites every time 5

6 Planned Signals L1-C/A L1C L2C L5 Frequency MHz MHz MHz Notes Complete compatibility and interoperability with existing and future modernized GPS signals Differential Correction data, Integrity flag, Ionospheric correction Almanac & Health for other GNSS SVs L1-SAIF * MHz Compatibility with GPS-SBAS LEX MHz Experimental Signal with higher data rate message (2Kbps) Compatibility & interoperability with Galileo E6 signal * L1-SAIF: L1-Submeter-class Augmentation with Integrity Function 6

7 Development Status - Space Segment - - MICHIBIKI- Mass Power Design Life Approx. 1,800kg (dry) (NAV Payload:Approx. 320kg) Approx. 5.3 kw (EOL) (NAV Payload: Approx. 1.9kW) 10 years Radiation Cooled TWT TWSTFT Antenna C-band TTC Antenna Laser Reflector L1-SAIF Antenna L-band Helical Array Antenna Satellite Configuration on Orbit 7

8 Development Status - Space Segment - Proto-flight Tests are on going IPT(20/8/2009-3/9/2009) Initial Alignment Test (5/9/ /9/2009) Preparation for TVT TVT (1/10/ /10/2009) Electrical Performance Test (21/11/ /11/2009) Alignment Test after TVT (23/11/ /11/2009) Sine Vibration Test (7/12/2009-6/1/2010) 8

9 Summary QZSS is a regional space-based PNT system covers East Asia and Oceania region and transmits six civil PNT signals. Proto-Flight tests of QZS-1 are being conducted. First satellite (QZS-1; MICHIBIKI) will be launched in

10 Current status of SPAC Application Development Satellite Positioning Research and Application Center General Manager Yasushi SAKURAI 10

11 Political Back Ground of the QZSS Private Sector Organization for promoting utilization Supporting Companies Collaboration Academic World Coordination Participation & Support SPAC Collaboration Japan Business Federation Government Collaborative Research Policy Recommendation Satellite Positioning Research and Application Center Participation Research Contract R&D Organizations Participation Coordination as private sector Global GNSS Collaboration Research Contract GNSS/GIS Industries & Organizations Satellite Positioning Research and Application Center (SPAC) was established in 5 February 2007 approved by the Ministers associated with QZSS research and development (MEXT, MIC, METI and MLIT) to promote navigation satellite technology application and consequential geo-spatial information utilization (

12 Application of QZSS Augmentation Service QZSS GPS Galileo GLONASS Upload Augmentation Data Acquisition Support Data Correction Data Integrity Data Navigation Signal and Message + Signal Master Control Station Augmentation Data L1-SAIF Signal (250bps) LEX Signal (2000bps) High Speed Rail Augmentation Data Japanese Geodetic Generation Datum Global Monitoring Station Survey Low Speed Machines(Construction, etc) 2cm LEX Signal 20cm Cars Accuracy L1-SAIF Signal Mobile/Personal Navigation 1m 12

13 L1-SAIF Application Demonstration Plans (1) Safety Protection of Children and Elderly Persons by Watching Positions (2) Natural Disaster Detection and Action Support (3) Service Innovation 13

14 LEX Application Demonstration Plan (1) Mobile Positioning System for Nationwide Base Map

15 LEX Application Demonstration Plan(Cont.) (2) Precision Agriculture based on it Automatic Driving 15

16 Summary SPAC has been investigating application of regional spacebased PNT system, focusing high precision L1-SAIF and LEX with industrial partners. Both L1-SAIF and LEX systems and terminals are now under development. Application demonstration is planned to be started from the beginning of the next year. 16