Current Status of the Japanese Quasi-Zenith Satellite System (QZSS)

Transcription

1 Current Status of the Japanese Quasi-Zenith Satellite System (QZSS) 12 November 2008 Koji TERADA QZSS Project Manager Japan Aerospace Exploration Agency

2 Contents Introduction Concept of the QZSS System description Space Segment Ground Segment Current Status (Recent Back Ground of the QZSS) Government Policy Private Sector-Government Relation Ship Current Development Status IS-QZSS Summery

3 Introduction Concept of the QZSS QZSS is designed so that at least one satellite out of three satellites exists near zenith over Japan. Three satellites are in elliptical and inclined geosynchronous orbits in different orbital planes to pass over the same ground track. (a=42,164km, e= , i=39-47deg, Ω= 120deg apart) QZSS Ground Track

4 Introduction User Benefits of QZSS (1/2) QZSS can provide a seamless service from high elevation angle. Increasing the availability of PNT services in downtown and mountainous areas. QZSS

5 Introduction User Benefits of QZSS (2/2) Availability at Ginza area (GPS 28, Galileo, QZSS 3) GPS alone +Galileo +QZSS +Galileo +QZSS Legend. 0-20, 20-40, :40-60, 60-80, %

6 System Description System architecture TWSTFT Up: GHz Down: GHz Navigation Signals L1: MHz L2: MHz L5: MHz LEX: MHz QZSS GP S Laser Ranging TT&C, NAV Message Upload** SLR Site Monitor Station NW Time Management Station TT&C NAV Message Uplink Station User Receiver Master Control Station(MCS) Function distributed in each institute Timing management, WDGPS correction, etc. **: S (Up: , Down: MHz) band for LEOP and C (Up: , Down:50-50MHz) band for Nominal Operation SLR: Satellite Laser Ranging, TWSTFT: Two Way Satellite Time and Frequency Transfer Geonet(GSI)

7 System Description Space Segment - QZS-1 - Mass Power Design Life Approx. 1,800kg (dry) (NAV Payload:Approx. 320kg) Approx. 5.3 kw (EOL) (NAV Payload: Approx. 1.9kW) years 25.3m Radiation Cooled TWT TWSTFT Antenna C-band TTC Antenna Laser Reflector L1-SAIF Antenna L-band Helical Array Antenna Satellite Configuration on Orbit

8 System Description Ground Segment 90 Soya Koganei Minimum Elevation Angle and Ground Track Okinawa Ogasawara Maspalomas Latitude (deg) 0 Bangalore 40 Bangkok Guam Hawaii Santiago - 20 Perth Canberra Longitude (deg) GPS MS site QZSS & GPS MS site 7 TT&C NAV Message Uplink Station

9 System Description Planed Signals L1-C/A L1C L2C L5 L1-SAIF * LEX Frequency MHz MHz 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 Compatibility with GPS-SBAS Experimental Signal with higher data rate message (2Kbps) Compatibility & interoperability with Galileo E6 signal *L1-SAIF: L1-Submeter-class Augmentation with Integrity Function

10 90 60 System Description Performance - Service Area Minimum Elevation Angle and Ground Track deg deg Latitude (deg) Longitude (deg) Ground track of a QZS Minimum Elevation Contour for 3 QZS over 24 hours * for maximum elevation of visible satellites

11 Current Development Status - Political Back Ground of the QZSS - March 2006, Committee on the promotion of GIS and Positioning Information has issued the Basic Policy on the Promotion of the QZSS project. Basic Act on the Advancement of Utilizing Geospatial Information (AUGI) August 2007, Basic Act on AUGI entered into force April 2008, Basic Plan for AUGI was approved by the Cabinet (based on Article 9 of the Basic Act on AUGI) Private Sector-Government Relation Ship is established. - Development Status of the QZS-1 - August 2008, System CDR had completed Flight H/W is being manufactured and tested - IS-QZSS - June 2008, Ver. 1.0 has been released. IS-QZSS ver. 1.0 is available on JAXA s web site.

12 Government Policy March 2006 Committee on the promotion of GIS and Positioning Information has issued the Basic Policy on the Promotion of the QZSS project. As the 1st stage (phase 1) technological verifications by R&D ministries and demonstrations by the private sector and governmental users will be carried out by using the first QZSS satellite. The QZSS plan will basically proceed to the 2nd stage (phase 2) on the government-private cooperation, after the evaluation of the results of technological verifications and demonstrations of the 1st stage. August 2007 Basic Act on the Advancement of Utilizing Geospatial Information (AUGI) entered into force. April 2008 Basic Plan for AUGI was approved by the Cabinet (based on Article 9 of the Basic Act on AUGI). Basic Policy on March 2006 is taken over to the Plan for AUGI.

13 Private Sector Government Relationship Government : QZSS project is based on the collaboration between private sector and government Research & development and integration of first satellite system, and inorbit demonstration of QZSS technology and application technology. Four-Ministries associated with QZSS research and development Ministry of Education, Culture, Sports, Science and Technology (MEXT) Ministry of Internal Affairs and Communications (MIC) Ministry of Economy, Trade and Industry (METI) Ministry of Land, Infrastructure and Transport (MLIT) Private sector : Research and business planning of commercial service by QZSS In-orbit demonstration of QZSS application technology in cooperation with government

14 Establishment of New Private Sector Organization 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 Organizatio ns 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

15 Activities of SPAC 1. Promotion of GNSS non-government utilization Promotion of utilization by private sector R&D for reliability and stability of satellite positioning R&D on the application of Geo-Spatial Information Promotion of demonstration of the GNSS application technology 2. Promotion of GNSS augmentation business development using QZSS Promotion of development of business Cooperation with the other countries and global GNSS system Standardization of related technology 3. Liaison representing private business world and industries for GNSS Dissemination and educational activity Representative of private business world and industries Cooperation with geospatial information related organizations

16 Promotion of QZSS Utilizations ICG/Workshop Participating for information exchange due to expand interoperability and compatibility with other GNSS Propagation and maintenance of the IS-QZSS Organizing QZSS User Meeting which has similar role of the Interface Control Working Group meeting for GPS Asia-Pacific Regional Space Agency Forum (APRSAF)

17 Sub-session for GNSS and Applications will be held in Communications Sub-Working Group of APRSAF Half day session on December AM To discuss; 1. Information exchange about GNSS, system development and applications in the region. 2. Discussion about future potential collaborations related to GNSS applications in the region

18 Current Development Status Space Segment QZS-1 AEF#5 L-band Antenna Pattern Test Proto-Flight Model(July 2008) QZS 軌道 AEF#4 GTO AEF#1 AEF#2 AEF#3 Completion of satellite system Critical design / CDR (August 2008) L-band Antenna Acoustic vibration Test (October 2008) Synthesizer PFM(2008) Development of main structure (Central Cylinder type) METI

19 Current Development Status Ground Segment QZS-1 NASA NOAA Site Survey for installing monitoring Station ( ) Kokee Park Geophysical Observatory (KPGO) National Weather Service Forecast Office (WFO) Indian Space Research Organisation (ISRO) Geoscience Australia (GA) Asian Institute of Technology (AIT) Constructing TT&C- NAV Message Uplink Station (2008)

20 IS-QZSS Describes Not only SIS ICD but also SPS, CONOPS, etc. System architecture of whole QZSS Signal structure and specifications Service performance properties Close relationship with GPS IS Documents All users can download freely from JAXA s web site Both Japanese and English versions are available.

21 IS-QZSS Release of IS-QZSS January 22, 2007 First draft of IS-QZSS (ver. 0.0) released. June 8, 2007 Second draft, IS-QZSS (ver. 0.1) released November, 2007 Third draft, IS-QZSS (ver. 1.0) released Ver. 1.0 has been released in June IS-QZSS ver. 1.0 is available on following web site.

22 Summery Political Back Ground August 2007, Basic Act on the Advancement of Utilizing Geospatial Information (AUGI) entered into force April 2008, Basic Plan for AUGI was approved by the Cabinet (based on Article 9 of the Basic Act on AUGI) Private Sector Government Relationship Responsibilities of each sector are defined. Promoting activities of the QZSS utilization are conducted by JAXA and SPAC. Development Status of the QZSS System CDR had completed last month. Flight H/W is being manufactured and tested. IS-QZSS First draft of IS-QZSS (ver. 0.0) was released January 22, Ver. 1.0 has been released in June IS-QZSS ver. 1.0 is available on following web site.

23 Thank you for your attention!! 20