Curriculum Vitaes
Profile Information
- Affiliation
- Assistant Professor, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
- Researcher number
- 30872444
- ORCID ID
https://orcid.org/0000-0003-1491-1940- J-GLOBAL ID
- 202001000326595612
- researchmap Member ID
- R000000445
Research Interests
6Research Areas
3Research History
4Education
3-
Apr, 2008 - Mar, 2012
Major Committee Memberships
4Major Awards
17Papers
31-
Acta Astronautica, 236 47-61, Nov, 2025 Peer-reviewed
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Acta Astronautica, 235 47-54, Oct, 2025 Peer-reviewed
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Publications of the Astronomical Society of Japan, 77(5) 1080-1089, Oct, 2025 Peer-reviewedAbstract We propose a mission concept, called the space interferometer laboratory voyaging towards innovative applications (SILVIA), designed to demonstrate ultra-precision formation flying between three spacecraft separated by 100 m. SILVIA aims to achieve submicrometer precision in relative distance control by integrating spacecraft sensors, laser interferometry, low-thrust, and low-noise micro-propulsion for real-time measurement and control of distances and relative orientations between spacecraft. A 100 m scale mission in a near-circular low Earth orbit has been identified as an ideal, cost-effective setting for demonstrating SILVIA, as this configuration maintains a good balance between small relative perturbations and low risk of collision. This mission will fill the current technology gap towards future missions, including gravitational wave observatories such as the decihertz interferometer gravitational wave observatory (DECIGO), designed to detect the primordial gravitational-wave background, and high-contrast nulling infrared interferometers such as the large interferometer for exoplanets (LIFE), designed for direct imaging of thermal emissions from nearby terrestrial planet candidates. The mission concept and its key technologies are outlined, paving the way for the next generation of high-precision space-based observatories.
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Acta Astronautica, 235 130-140, Oct, 2025 Peer-reviewedLead authorCorresponding authorPrecise satellite formation flying is a promising technology that enables unprecedented astronomical observations. For comprehensive astronomical missions, preliminary small satellite missions in low Earth orbit (LEO) have been proposed. However, various perturbation sources in LEO can disturb rigid and precise formation control. This study proposes an approach that combines feedforward and feedback controls to attain precise formation flying in LEO. The developed feedforward control can compensate for major gravitational perturbations, predicted from the absolute position and velocity of spacecraft. In addition, the feedback control can address uncertain and unmodeled perturbations. Consequently, the hybrid approach can yield a smaller tracking error than feedback control alone. This novel approach is reliable and robust against environmental uncertainties—including atmospheric density, high-order Earth gravitational potentials, and third-body gravity—and systematic uncertainties—including atmospheric and solar radiation coefficients and thrust errors of spacecraft. Indeed, closed-loop control simulations of a linear astronomical interferometer under such uncertainties reveal a significant reduction in tracking error and feedback controller load using feedforward control, potentially making precise and reliable formation flying in LEO much achievable.
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Acta Astronautica, 234 13-25, Sep, 2025 Peer-reviewed
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Aeronautical and Space Sciences Japan, 73(6) 207-210, Jun 5, 2025
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Journal of Guidance, Control, and Dynamics, 48(6) 1298-1313, Jun, 2025 Peer-reviewedLead authorCorresponding author
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航空宇宙技術, (accepted), 2025 Peer-reviewedLead authorCorresponding author
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Journal of Evolving Space Activities, 2, Sep 2, 2024 Peer-reviewed
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Astronomy & Astrophysics, 682(A38), Feb, 2024 Peer-reviewedLead authorCorresponding author
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Transactions of the Japan Society for Aeronautical and Space Sciences, 67(1), Jan, 2024 Peer-reviewed
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Journal of Guidance, Control, and Dynamics, 46(4) 695-708, Apr, 2023 Peer-reviewedLead authorCorresponding author
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Transactions of the Society of Instrument and Control Engineers, 58(3) 194-201, Mar, 2022 Peer-reviewedSpace missions require “resilience” to flexibly complete the mission in response to changes in the environment and system characteristics. The present study proposes a method for autonomously planning a corrective control law for lunar landing trajectory control to cope with off-nominal conditions and reflecting it in resilience improvement measures by utilizing reinforcement learning. The proposed method employs a reinforcement learning problem in which an agent is additionally placed in the control loop and the corrective control input as an action output by the agent is added to the original closed-loop control input. The results and insights are summarized for the resultant agent's characteristics which autonomously detect off-nominal conditions and proactively implement recovery measures, while verifying the capability and effectiveness of the proposed design framework enabled by a reinforcement learning architecture in a realistic and specific lunar landing sequence.
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Doctoral Dissertation, The University of Tokyo, Sep, 2021 Lead author
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Progress of Theoretical and Experimental Physics, 2021(5), May 1, 2021 Peer-reviewed
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Journal of Guidance, Control, and Dynamics, 44(4) 854-861, Apr, 2021 Peer-reviewedLead authorCorresponding author
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Acta Astronautica, 176 438-454, Nov, 2020 Peer-reviewedLead authorCorresponding author
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日本航空宇宙学会誌, 68(6) 194-199, Jun, 2020 Lead authorCorresponding author
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Acta Astronautica, 170 206-223, May, 2020 Peer-reviewedLead authorCorresponding author
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JOURNAL OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, 68(2) 89-95, 2020 Peer-reviewed<p>A Fault Detection, Isolation, and Recovery (FDIR) algorithm for attitude control systems is a key technology to increasing the reliability and survivability of spacecraft. Micro/nano interplanetary spacecraft, which are rapidly evolving in recent years, also require robust FDIR algorithms. However, the implementation of FDIR algorithms to these micro/nano spacecraft is difficult because of the limitations of their resources (power, mass, cost, and so on). This paper shows a strategy of how to construct a FDIR algorithm in the limited resources, taking examples from micro deep space probe PROCYON. The strategy focuses on function redundancies and multi-layer FDIR. These ideas are integrated to suit the situation of micro/nano interplanetary spacecraft and demonstrated in orbit by the PROCYON mission. The in-orbit results are discussed in detail to emphasize the effectiveness of the FDIR algorithm. </p>
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日本航空宇宙学会誌, 68(2) 32-37, 2020
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IEEE Transactions on Aerospace and Electronic Systems, 55(6) 2674-2686, Dec, 2019 Peer-reviewed
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Acta Astronautica, 152 299-309, Nov, 2018 Peer-reviewedLead authorCorresponding author
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航空宇宙技術(Web), 17 45-54, 2018 Peer-reviewedThanks to recent lunar exploration missions, high-resolution lunar surface observation data was obtained. In future lunar exploration, landing is being requested at a specific point having higher scientific interest than other areas. The SLIM project is demonstrating pinpoint landing technology, which entails a combination of “autonomous image-based high-precision navigation technology” and “autonomous guidance technology intended to generate a fuel-optimum landing trajectory.” This paper presents powered descending trajectory design in terms of trajectory optimization. As usually considered in general space mission development, an optimal solution in terms of minimum fuel consumption is the basis of investigation. This study addresses trajectory optimization considering specific objective functions derived from practical constraints regarding mission design, such as altitude, downrange length, and visibility from ground stations. In this paper, nominal trajectory design considering minimum fuel consumption is first presented, followed by parametric studies to identify the sensitivity to changes in initial conditions under which powered descending starts. Finally, trajectory optimization results with various types of objective functions are presented.
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Transactions of the Japan Society for Aeronautical and Space Sciences, 60(3) 181-191, 2017 Peer-reviewed
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日本航空宇宙学会論文集, 63(6) 257-264, 2015 Peer-reviewedIn this paper is presented a microgravity experiment system utilizing a high altitude balloon. The feature is a double shell structure of a vehicle that is dropped off from the balloon and a microgravity experiment section that is attached to the inside of the vehicle with a liner slider. Control with cold gas jet thrusters of relative position of the experiment section to the vehicle and attitude of the vehicle maintains fine microgravity environment. The design strategy of the vehicle is explained, mainly referring to differences from the authors' previous design. The result of the flight experiment is also shown to evaluate the characteristics of the presented system.
Major Misc.
80-
Report prepared for the W. M. Keck Institute for Space Studies (KISS), California Institute of Technology, Aug, 2025 Invited
Major Presentations
38-
2025 AIAA SciTech Forum, Orlando, The United States, Jan, 2025
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12th International Workshop on Satellite Constellations and Formation Flying, Kaohsiung, Taiwan, Dec, 2024
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Seminar, NASA Jet Propulsion Laboratory, Pasadena, The United States, Nov, 2024 InvitedHosted by Dr. Andrew E. Johnson
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In the class of "Applied Control in Astronautics," Purdue University, Online, Apr, 2024 InvitedHosted by Prof. Ken Oguri
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Seminar, Exoplanets and Habitability Group, ETH Zurich, Switzerland, Apr, 2024 InvitedHosted by Prof. Sascha P. Quanz
Teaching Experience
2-
2025 - Present航空宇宙工学特殊講義C：宇宙プロジェクト実践とその基礎学理 (大阪公立大学)
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2024 - 2025サステイナブル工学先端特論：月惑星着陸探査の最前線 (東京工科大学大学院)
Professional Memberships
2Major Works
7Research Projects
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Flont Loading for Space and Astronautical Technology, Institute of Space and Astronautical Science, Apr, 2021 - Mar, 2027
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KAKENHI Grant-in-Aid for Young Scientists, Japan Society for the Promotion of Science, Apr, 2023 - Mar, 2026
Industrial Property Rights
2Major Academic Activities
7-
Peer reviewOct 1, 2023 - Sep 30, 2024
Major Social Activities
24Major Media Coverage
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Universe Today, Apr 16, 2025 InternetInterferometry connects multiple telescopes into a single large telescope with higher resolution. It works on Earth, but an interferometer space telescope has always been a dream, with NASA's Terrestrial Planet Finder getting canceled decades ago. There's too much technical risk. A new research paper proposes a scaled-down, ultraprecision formation flying mission called SILVIA, which would test the key technology to enable future interferometer space telescopes.
