The technical contribution of QZSS and GNSS to Tsunami early warning system

Transcription

1 0/17 Tsunami Workshop by Sentinel International Center Meeting Room 5 The technical contribution of QZSS and GNSS to Tsunami early warning system July 3, 2012 K. Mutoh, J. Yamashita, and S. Kogure Satellite Applications and Promotion Center (SAPC) Japan Aerospace Exploration Agency QZSS: Quasi-Zenith Satellites System

2 Contents 1/17 Background Introduction to QZSS Next generation high accuracy positioning platform and development status Application to Tsunami buoy system Conclusion and Future work

3 Background 2/17 Requirements Real-time tsunami detection of more than 0km coastal areas. Real-time positioning of the buoy for seafloor crustal movement measurement. Communication satellite Tsunami warning m-triton GPS QZSS LEX signal QZSS/GNSS positioning for Tsunami detection Buoy Objective Study the applicability and effectiveness of QZSS in tsunami disaster. Tsunami detection Crustal movement Sea floor pressure sensor Seafloor station

4 Introduction to QZSS 3/17 Coverage: East Asia and Oceania region Six Signals: L1C/A, L1C, L2C and L5 can provide seamless PNT services by combining usage with GPS. Increasing coverage and availability of PNT services even in downtown and mountainous areas. L1-SAIF on MHz LEX on MHz can enhance GPS performance by transmitting error correction and integrity information. Accelerate: the modernization of GPS in Asia Oceania region. Platform: for Multi-GNSS augmentation. First satellite: launched in September 20.

5 QZSS coverage and Visibility in Asia & Oceania Minimum Elevation Angle and Ground Track 20 GPS Elevation Angle N Elevation Angle (deg) 70 QZS-1 QZS-2 QZS-3 GPS S E 80 W Simulation Time (hrs) GPS Elevation Angle Profile@Bangkok N W E Elevation Angle (deg) QZS-1 QZS-2 QZS-3 GPS S Simulation Time (hrs) GPS Elevation Angle Profile@Sydney N Elevation Angle (deg) Latitude (deg) 4/17 W QZS-1 QZS-2 QZS-3 GPS 50 E S Simulation Time (hrs) 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.

6 GPS Complementary 5/17 QZSS improves positioning availability time Complementary signals sent from high elevation will improve the time percentage of positioning availability from 90 % (GPS only) to 99.8 % * (GPS + QZSS.) GPS QZS * The time percentage that the position dilution of precision (PDOP) is less than 6 when a satellite whose elevation angle is 20 degrees or over is used for positioning calculation. Source: Japan s Strategic Headquarters for Space Development

7 GPS Reinforcement 6/17 QZSS improves positioning accuracy QZSS upgrades the positioning accuracy to a sub-meter or several centimeter level. Augmentation Data Acquisition Support Data Correction Data Integrity Data QZS GPS Navigation Signal Galileo GLONASS Ground Segment GPS Earth Observation Network Master Control Station Augmentation Data Generation Global Monitoring Stations LEX centimeter (accuracy ) Navigation Signal and Augmentation Data L1-SAIF (250 bps) LEX (2000 bps) User Segment L1-SAIF sub-meter Source: Japan s Strategic Headquarters for Space Development

8 Next-gen high accuracy positioning platform 7/17 GPS GLONASS Galileo QZSS : MICHIBIKI navigation signal Internet (MGM-net etc.) NTRIP Caster (External server) RTCM LEX message Tracking &Control Station (Okinawa) LEX message LEX signal Including precise orbit and clock of Multi-GNSS Current target accuracy is less than cm. PPP users Multi-GNSS Application Demonstration orbit & clock estimation MADOCA Data interface LEX message generation RTCM SSR extension LEX message LEX message Master Control Station(MCS) Tsukuba space center MADOCA: Muliti-gnss Advanced Demonstration tool for Orbit-and-Clock Analysis Various demonstration experiments example: detection and warning of Tsunami precise agriculture estimation of precipitable water

9 MGM-Net status 8/17 MGM-Net is to be deployed globally aiming to: Improve multi-gnss including QZSS orbit and clock determination performance Develop and demonstrate Multi-GNSSPPP applications Target: sites hosting JAXA s Rx + collaborative networks 90% 80% 70% % 50% 40% % 20% Candidate Sites for MGM-net Selected site QZSS MS Candidate site Site operated by partner organization

10 Orbit and clock estimation system 9/17 JAXA has been preparing precise orbit and clock estimation system. 1 st gen system has been developed for the current operating QZSS MCS and realtime PPP user accuracy < cm (Horizontal) < cm (Vertical) was achieved. Now 2 nd gen system named MADOCA is being developed aimed less than cm PPP user accuracy. Offline estimation Realtime estimation GPS GLO QZS Gal GPS GLO QZS Gal Schedule 2011FY 2012FY Target accuracy Orbit[cm] Clock[ns] (Multi-GNSS Advanced Demonstration tool for Orbit and Clock Analysis)

11 MADOCA Development Status /17 The offline estimation performance of MADOCA reaches almost as same as IGS analysis centers. GPS orbit/clock Error comparison with IGS Analysis Centers Radial Along- Track Cross- Track GPS orbit accuracy compared by IGS final Clock- Bias GPS clock accuracy compared by IGS final Source: Takasu et al., special lecture on the Institute of Positioning, Navigation and Timing of Japan 2012

12 MADOCA Development Status 11/17 GLONASS orbit Error comparison with IGS Analysis Centers Radial Along- Track Cross- Track GLONASS orbit accuracy compared by IGS final Clock error has not been evaluated because GLONASS clock is not provided in IGS final products now. Source: Takasu et al., special lecture on the Institute of Positioning, Navigation and Timing of Japan 2012

13 Offline PPP user accuracy 12/17 PPP user accuracy based on MADOCA s offline orbit / clock estimation MADOCA for real time processing is scheduled to be completed in 2012 FY, then real time LEX-PPP experiments will be started. Source: Takasu et al., special lecture on the Institute of Positioning, Navigation and Timing of Japan 2012

14 Application to Tsunami buoy system 13/17 Install GNSS receiver on tension mooring buoy Compare LEX-PPP with Kinematic (BL=13, 47km) 1 st gen orbit/clock estimation system QZS-1 MICHIBIKI Data analysis in postprocess GPS GPS GPS GPS Base station#1 47km Kochi prefecture, Japan Base station#2 Compare LEX-PPP with kinematic method Off Muroto cape Tsunami monitoring buoy 出典 : 日立造船

15 Experiment Results (Availability) 14/17 1day statistics (15sec interval) Date(UTC) Kinematic* 1 (BL13km) Sep (calm) Sep (procellous) Kinematic* 1 (BL47km) 92.7% 72.3% 0% 97.0% 77.8% 0% LEX-PPP* 2 Wind Speed* 3 [m/s] Ave. 4 Max 6.1 Ave Max hour statistics (1sec interval) Date/Time (UTC) Sep :00-11:00 Sep :00-11:00 Kinematic* 1 (BL13km) Kinematic* 1 (BL47km) LEX-PPP* 2 Wind Speed* 3 [m/s] 82.1% 76.2% 0% Ave % 88.1% 0% Ave * 1 Count fix solution * 2 Count PPP solution * 3 At Muroto cape

16 Experiment Results (Vertical Accuracy) 15/17 Sep. (calm) :00-11:00(UTC) 1 hour 1 hour Sep.16 (procellous) :00-11:00(UTC) Height[m] Height[m] Height[m] Height[m] Time[HH:MM] Time[HH:MM] sec sec Time[MM:SS] Time[MM:SS]

17 Experiment Results (Horizontal Accuracy) Sep. (calm) :00-11:00(UTC) 1 hour 1 hour Time[MM:SS] Time[MM:SS] 16/17 East-West axis[m] North-South axis[m] Time[HH:MM] Time[HH:MM] sec sec East-West axis[m] North-South axis[m]

18 Conclusion and Future work 17/17 QZSS is a regional space-based PNT system which covers East Asia and Oceania region. And first satellite Michibiki has been launched in September 20 and now available. LEX signal sent by QZS is expected as a method to achieve high precision positioning easily even in ocean away from the coast. From the experiment, proposed method has advantage especially in availability. we expect QZSS and GNSS will contribute to tsunami early warning system. >Future work Install GNSS-Rx on JAMSTEC buoy m-triton. Data collection (approx. 3 months) and analysis by comparing to result from seafloor pressure sensor. (post processing). Deployment of Multi GNSS Monitoring network. (MGM-Net) PPP-AR technique is to be adopted for further accuracy improvement. LEX message will be modified to more suitable format for real-time PPP.

19 Our Planet from QZS-1 MICHIBIKI Q uasi-z enith Satellite System Q uasi-z enith Satellite System Q uasi-z enith Satellite System Thank you very much for kind attention This wallpaper can be downloaded from QZ-vision website(

20 ASIA OCEANIA MULTI-GNSS DEMONSTRATION CAMPAIGN Multi-GNSS Monitoring Network Application Demonstration Disaster Mitigation Regional Workshop 3 rd Workshop, Nov. Jeju, Korea: Precise Positioning ITS 2 nd Workshop, Nov. Melbourne, Australia LBS 1 st Workshop on GNSS, JAN. Bangkok, Thailand Other, ionospheric observation etc 19

21 THE 4 TH ASIA OCEANIA REGIONAL WORKSHOP ON GNSS Purpose Discussion about new application experiments of GNSS and Information sharing of the results of the current status of the activities of Multi-GNSS Asia. Date 9-th Dec Venue Kuala Lumpur, Malaysia (Berjaya Times Square Hotel) Co-Host Organization: JAXA, ANGKASA, SPAC Support Organization: ICG, IGS Contents What s new about GNSS GNSS Applications presentations Reports of Activities of Multi-GNSS Asia (MGA)