Members

Investigator

Principal Investigator

professor_tsujii

Prof. Toshiaki Tsuji（Aerospace Systems Engineering Group）

Japan Aerospace Exploration Agency(JAXA), Aviation Technology Directorate

Aviation Safety Innovation Hub, an honorary  member

 

Research Description

Satellite navigation (GNSS) is widely used with the U.S. GPS, but with the development of Russia's GLONASS, Europe's Galileo, and Japan's QZSS (Quasi-Zenith Satellite System), this field is expected to develop rapidly in the future.

In our laboratory, we are studying centimeter-level positioning and precise attitude estimation using GNSS, as well as navigation systems for manned and unmanned aircraft in combination with inertial navigation systems (INS). Recently, we have been working on a robust GNSS receiver augmented with INS to continue navigation in the presence of ionospheric anomalies and radio interference. We are also conducting research on technology to prevent aircraft accidents caused by turbulence and on guidance and control of unmanned aerial vehicles.

 

Recently Published Papers

  • 米山 まうむ, 辻井 利昭, 藤原 健, 山本 健広., "Nullspace Projectionを用いたGNSSスプーフィングの検知及び抑制", 日本航空宇宙学会論文集   72 ( 5 )   164 - 174, 2024年10月（ ISSN:13446460 ） .
  • 芝田淳之介，辻井利昭，藤原 健，大澤壮志., "スプーフィング検知に向けたMUSIC法による信号到来方向推定", 日本航空宇宙学会論文集   70 ( 5 ), 2022年10月.
  • Horng-Yue Chen , Ya-Ju Hsu , Ryoya Ikuta , Hsin Tung , Chi-Hsien Tang ,Chin-Shang Ku , Hsuan-Han Su, Pei-Ru Jian , Masataka Ando , and Toshiaki Tsujii., "Strain Partitioning in the Southern Ryukyu Margin Revealed by Seafloor Geodetic and Seismological Observations", Geophysical Research Letters   49 ( 6 ), 2022.
  • 田中晋平，辻井利昭., "機械学習を利用したGNSS反射波検知モデルの構築と単独測位への適用", 日本航空宇宙学会論文集   69 ( 6 ), 2021年12月.
  • Toshinori MORI, Adriana ANDREEVA-MORI, Yoshinori MATSUNO, Toshiaki TSUJII., "Effect of Enroute Time Management on Flight Trajectories in the Terminal Area", Trans. JSASS Aerospace Tech. Japan   19 ( 6 )   813 - 820, 2021.
  • 粟井 睦，辻井利昭，藤原 健，大澤壮志., "GNSS 測位における不要波への Null 形成を含む適応型ビームフォーミング", 日本航空宇宙学会論文集   69 ( 3 )   122 - 127, 2021年06月.
  • H-Y. Chen, R. Ikuta, Y-J. Hsu, T. Tsujii, M. Ando, Y. Tu , Kohmi T, K. Takemoto, K. Mizuno, H. Tung, C-S. Ku and C-H. Lin., "A Decade of Global Navigation Satellite System/Acoustic Measurements of Back-Arc Spreading in the Southwestern Okinawa Trough", Front. Earth Sci. 9:601138. doi: 10.3389/feart.2021.601138, 2021.
  • V. Uaratanawong, C. Satirapod, T. Tsujii., "Evaluation of multipath mitigation performance using signal-to-noise ratio (SNR) based signal selection methods", Journal of Applied Geodesy 15(1):75-85.   15 ( 1 ), 2020.
  • J. Berdermann, H. Sato, M. Kriegel, T. Fujiwara, T. Tsujii., "Effects Of Equatorial Ionospheric Scintillation For GNSS Based Positioning In Aviation", 2020 European Navigation Conference (ENC) IEEE, 2020.
  • Valanon Uaratanawong, Chalermchon Satirapod and Toshiaki Tsujii., "OPTIMISATION TECHNIQUE FOR PSEUDORANGE MULTIPATH MITIGATION USING DIFFERENT SIGNAL SELECTION METHODS", ARTIFICIAL SATELLITES   55 ( 2 ), 2020.
  • Horng-Yue Chen, Ryoya Ikuta, Cheng-Horng Lin, Ya-Ju Hsu, Takeru Kohmi, Chau-Chang Wang, Shui-Beih Yu , Yoko Tu , Toshiaki Tsujii, and Masataka Ando., "Back-Arc Opening in the Western End of the Okinawa Trough Revealed From GNSS/Acoustic Measurements", Geophysical Research Letters   45 ( 1 ), 2018.
  • Fujiwara, Tsujii, T., "GBAS Availability Assessment and Modeling of Ionospheric Scintillation Effects", NAVIGATION, Journal of The Institute of Navigation, Vol. 63, No. 4, Winter 2016, pp. 405-413.
  • Tsujii, T., Fujiwara, T., Kubota, T., "Improvement of INS-Aided GPS Tracking Performance under Strong Ionospheric Scintillation", NAVIGATION, Journal of The Institute of Navigation, Vol. 62, No. 2, Summer 2015, pp. 111-119.
  • T. Tsujii, T. Fujiwara, T. Kubota, Y. Kubo: Testing of an Ultra-tightly coupled GPS/INS under Strong Ionospheric Scintillation, Transactions of the Institute of Systems, Control and Information Engineers Vol.27, No.12, pp.476-485, 2014.
  • WANG, J., ALMAGBILE, A., WU, Y., & TSUJII, T., 2012. Correlation analysis for fault detection statistics in integrated GNSS/INS systems. Journal of Global Positioning Systems, Vol.11, No.2, pp.89-99, 2012.
  • T. Tsujii, T. Fujiwara, T. Kubota, C. Satirapod, P. Supnithi, T. Tsugawa, and H. K. Lee: Measurement and Simulation of Equatorial Ionospheric Plasma Bubbles to assess their impact on GNSS performance, Journal of Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, Vol. 30, No. 6-2, pp.517-523, 2012.
  • J. Wang, A. Almagbile, Y. Wu and T. Tsujii: Correlation Analysis for Fault Detection Statistics in Integrated GNSS/INS Systems, Journal of Global Positioning Systems, Vol.11, No.2 (2012)
  • I. Petrovski and T. Tsujii: Digital Satellite Navigation and Geophysics: A Practical Guide with GNSS Signal Simulator and Receiver Laboratory（ケンブリッジ大学出版,2012）
  • T. Tsujii, T. Fujiwara, Y. Suganuma, H. Tomita, and I. Petrovski: Development of INS-Aided GPS Tracking Loop and Flight Test Evaluation, SICE Journal of Control, Measurement, and System Integration, Vol. 4, No. 1, pp. 015-021 (2011)
  • H-Y. Chen, S-B. Yu, H. Tung, T. Tsujii and M. Ando (2011): GPS Medium-Range Kinematic Positioning for the Seafloor Geodesy off-Eastern Taiwan, Engineering Journal, Chulalongkorn University, Vol 15, No 1(2011)

　

Books and other publications

  • 辻井利昭, 佐藤友紀: 詳しくわかる　衛星測位システム　準天頂衛星の活用と高精度測位まで(科学情報出版株式会社, 2025)
  • Ivan Petrovski, Toshiaki Tsujii: Digital Satellite Navigation and Geophysics: A Practical Guide with GNSS Signal Simulator and Receiver Laboratory(Cambridge university press, 2012)
  • 杉本末雄，柴崎亮介編：GPSハンドブック（朝倉書店，2010）第10章「疑似衛星（スードライト）」執筆

    　

    Awards

    • 日本航空宇宙学会技術賞 2016.4
    • 科学技術分野の文部科学大臣表彰 科学技術賞（開発部門）2016.4
    • Best Paper Award of International Technical Conference on Circuits/Systems, Computer and Communications 2012　(ITC-CSCC 2012)2013.7

    　

    Academic Affiliations

    • The Japan Society for Aeronautical and Space Sciences(JSASS, 日本航空宇宙学会）
    • The Institute of Electronics, Information and Communication Engineers(IEICE, 電子情報通信学会）
    • The Institute of Positioning, Navigation and Timing of Japan(IPNTJ, 測位航法学会）
    • JSASS　 Electronics and Information Systems Division Committee　Member 2004.4 - 2006.3，2018.3 - Current
    • JSASS　 Air Traffic Management (ATM) Division Committee　Member 2014.4 - 2018.3
    • The Institute of Electrical Engineers of Japan(IEEJ, 電気学会)　Research Committee for G-spatial Advancement by Positioning　Member 2010.10 - Current
    • IPNTJ　Satellite Positioning Engineer Certification Subcommittee　Manager 2016.4 - 2019.2
    • 公益財団法人）航空輸送技術研究センター(ATEC)　「新たな進入・出発方式に関する調査・研究WG」委員 2013.4 - 2018.3
    • 一般財団法人）航空振興財団　航法小委員会　委員 2013.4 - 2018.3
    • Society for Advancement of Positionning Technologies（SAPT, 測位技術振興会）　Vice President 2019.4 - Current

     

    Joint Investigator 

     fujiwara

    • Ken Fujiwara

       Japan Aerospace Exploration Agency(JAXA), Aviation Technology Directorate

       Aviation Safety Innovation Hub

    • Takehiro Yamamoto

       Japan Aerospace Exploration Agency(JAXA), Aviation Technology Directorate

       Aviation Safety Innovation Hub

    • Suguru Naruoka

       Japan Aerospace Exploration Agency(JAXA), Aviation Technology Directorate

    Students

    M2

    • Riki Katsurada
    Topic Impact of spoofing on autonomous GNSS controlled vehicles and countermeasures using IMU-based navigation

    • Takuto Muraoka

    Topic

    		 Study on a highly accurate Doppler frequency measurement method using LEO satellites

    • Mori Kansuke

    Topic

    		 Research on reducing the effects of jamming using EBAA in GNSS positioning

    M1

    • Yuto Tanaka
    Topic Robust self-localization for outdoor mobile robots using 2D LiDAR/IMU/GNSS fusion
    • Takuto Muraoka
    Topic Study on integrity monitoring of PPP-RTK positioning using CLAS, taking into account GNSS signal strength and elevation angle

        B4

        • Yuri Sano
        • Taiga Ueno
        • Takuma Kuroki

        Alumni

        • Kento Shiokawa

        Topic

        		 Exploration of Potential Routes for Low-Altitude UAM Operation near Kansai International Airport 
        • Riku Awai
        Topic GNSS Adaptive Beamforming Including Null-steering for Unwanted Signal

        • Yuki Ono
        Topic Reducing Initial Convergence Time of Precise Point Positioning by Triple-Frequency Ambiguity Resolution

        • Shimpei Tanaka
        Topic Development of a Model to Detect GNSS Reflected Signals Using Machine Learning and Application to Positioning

        • Shuki Yoshida
        Topic GNSS Multipath Error Mitigation Using Dual-Polarization Antenna

        • Hiroko Sakakura
        Topic Estimation of Earth’s Surface Characteristics by GNSS Reflectometry Using a Dual-Polarization Antenna

        • Junnosuke Shibata
        Topic DOA Estimation of GNSS Signals Using an Array Antenna for Anti-Spoofing

         

        • Toshinori Mori
        Topic Effect of Air Traffic Flow Management and Point Merge System on Air Traffic Flow

          

        • Kensuke Eguchi
        Topic Fast attitude determination of small flying vehicle using multi-antenna GPS 

         

        • Yumeko Kawabata
        Topic Development of a Model to Detect GNSS Reflected Signals by Using Doppler Frequency and its Application to Kinematic Positioning 

         

        • Daigo Iki
        Topic Simulation to Examine the Positioning Feasibility by Combining the Quasi-Zenith Satellite System (QZSS) and Low Earth Orbit (LEO) Satellite Constellation

        • Ryo Yama
        Topic Evaluation of Mobile Positioning Accuracy Using Multi-GNSS/INS Integrated Navigation

        • Yuki Akizuki
        Topic Improvement of positioning accuracy through weighting based on the type of GPS signals

        • Hideto Shiotani
        Topic The research on GNSS spoofing detection Using IMU integration

        Past
        Topic

        		 Reliability Assessment of Flight Data in Small Aircraft Using Smartphones

        • Yoshiki Nakase
        Topic Research on the observation of ionospheric plasma bubbles using low earth orbit satellites

        • Yoshihiro Yamauchi
        Topic Improvement of PPP performance by detecting, estimating and removing GNSS cycle slips

        Past Topic Analysis of Ｌoosely Coupled PPP/INS Integrated Navigation
          • Daiki Kawahara 
          Topic Research on Error Reduction Using Dual Circularly Polarized Antennas During Satellite Tracking in Multipath Environments
              • Hiroaki Bonno
              Topic Research on Next-Generation Air Traffic Management Methods Considering a Conflict between Aircrafts
                • Maumu Yoneyama
                Topic The DOA Estimation and the Mitigation of Undesired Signals with GNSS Antenna Array
                  • Kouki Matsumoto
                  Topic Deriving the Protection Level of an Automobile Running in a Multipath Environment.

                  • Kota Ikeno
                  Topic A Study of Unwanted Wave Suppression Using PIAA in GNSS Positioning
                    • Yuto Takeuchi
                    Topic Investigation of Triple-baseline GPS Attitude Estimation Methods with Integrity Monitoring
                          • Naoya Matsufuji
                          Topic Doppler Navigation Using Low Earth Orbit (LEO) Satellites
                                  • Taisei Wakugawa
                                  Topic Research on improving PPP accuracy considering phase wind up effect
                                      • Naoto Yasugi 
                                      Topic Vulnerability assessment of GPS-dependent systems and proposal of a general-purpose spoofing detection method
                                            • Akiho Sema
                                            Topic Suppression of GNSS Jamming by Power Inversion Adaptive Array
                                            • Miyu Tyosa
                                            Topic Impact of spoofing on SLAM/GNSS combined navigation

                                            • Atsushi Osaka
                                            Topic Research on Robust Navigation and Anchor Position Estimation Using GNSS/UWB/INS Fusion
                                            • Akito Kitamura
                                            Topic A Study on High-Precision Target Imaging Using GNSS Multistatic SAR
                                            • Haruki Tanimura
                                            Topic Tightly Coupled GNSS/IMU Hybrid Navigation Using Factor Graph Optimization with NLOS Detection Capability
                                            • Yousuke Araga
                                            Topic A Study on Positioning Methods Using the Doppler Frequency of Iridium NEXT