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Naoya Ozaki

  (尾崎 直哉)

Profile Information

Affiliation
Associate Professor, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
Associate Professor, Space and Astronautical Science, Department of Advanced Studies, The Graduate University for Advanced Studies, SOKENDAI
Fuseki inc.
Degree
博士（工学）(東京大学)
Researcher number
90836222
ORCID ID
 https://orcid.org/0000-0002-8445-1575
J-GLOBAL ID
201801006720467786
Researcher ID
GXH-5604-2022
researchmap Member ID
B000312477

Research Interests

 10

Research Areas

 1

Research History

 5

Education

 3

Major Awards

 8
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Papers

 66
  • Masato Shibukawa, Fumi Yoshida, Toshifumi Yanagisawa, Takashi Ito, Hirohisa Kurosaki, Makoto Yoshikawa, Kohki Kamiya, Ji-an Jiang, Wesley Fraser, J. J. Kavelaars, Susan Benecchi, Anne Verbiscer, Akira Hatakeyama, O. Hosei, Naoya Ozaki
    PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 78(1) 335-348, Feb, 2026  
  • Masato Shibukawa, Fumi Yoshida, Toshifumi Yanagisawa, Takashi Ito, Hirohisa Kurosaki, Makoto Yoshikawa, Kohki Kamiya, Ji-an Jiang, Wesley Fraser, JJ Kavelaars, Susan Benecchi, Anne Verbiscer, Akira Hatakeyama, Hosei O, Naoya Ozaki
    CoRR, abs/2512.05415, Dec, 2025  
  • Nicola Marmo, Alessandro Zavoli, Naoya Ozaki
    JOURNAL OF GUIDANCE CONTROL AND DYNAMICS, 48(11) 2495-2511, Nov, 2025  
  • 直哉 尾崎
    Oct 7, 2025  
    近年の技術発展に伴う小惑星発見数の増加を受けて，プラネタリーディフェンスに対する国際的な関心が高まっている．今後10年で，小惑星発見数が更に増加することが予想されており，小惑星衝突の危機が顕在化するようになる．こうした危険小惑星が発見された際に，速やかに対応策を模索するために，危険小惑星に対する即応型フライバイ探査が注目されつつある．本解説では，複数の探査機を小惑星フライバイサイクラー軌道という特殊な軌道に待機させておき，即応型フライバイ探査を実現する深宇宙コンステレーション構想の概要を説明する．本構想では，即応型フライバイ探査だけでなく，超高頻度な小惑星マルチフライバイ探査も可能であり，地球近傍小惑星に対する統計的な情報収集の観点でも，プラネタリーディフェンスに貢献する．また，ある探査機の喪失を他の探査機群で補うことができるため，より挑戦的な技術を継続的に実証していく機会としても有効であり，宇宙工学の飛躍的な発展に寄与する．
  • Takayuki Yamamoto, Naoya Ozaki
    IAF Space Exploration Symposium, 376-385, 2025  
  • Geraint H. Jones, Colin Snodgrass, Cecilia Tubiana, Michael Küppers, Hideyo Kawakita, Luisa M. Lara, Jessica Agarwal, Nicolas André, Nicholas Attree, Uli Auster, Stefano Bagnulo, Michele Bannister, Arnaud Beth, Neil Bowles, Andrew Coates, Luigi Colangeli, Carlos Corral van Damme, Vania Da Deppo, Johan De Keyser, Vincenzo Della Corte, Niklas Edberg, Mohamed Ramy El-Maarry, Sara Faggi, Marco Fulle, Ryu Funase, Marina Galand, Charlotte Goetz, Olivier Groussin, Aurélie Guilbert-Lepoutre, Pierre Henri, Satoshi Kasahara, Akos Kereszturi, Mark Kidger, Matthew Knight, Rosita Kokotanekova, Ivana Kolmasova, Konrad Kossacki, Ekkehard Kührt, Yuna Kwon, Fiorangela La Forgia, Anny-Chantal Levasseur-Regourd, Manuela Lippi, Andrea Longobardo, Raphael Marschall, Marek Morawski, Olga Muñoz, Antti Näsilä, Hans Nilsson, Cyrielle Opitom, Mihkel Pajusalu, Antoine Pommerol, Lubomir Prech, Nicola Rando, Francesco Ratti, Hanna Rothkaehl, Alessandra Rotundi, Martin Rubin, Naoya Sakatani, Joan Pau Sánchez, Cyril Simon Wedlund, Anamarija Stankov, Nicolas Thomas, Imre Toth, Geronimo Villanueva, Jean-Baptiste Vincent, Martin Volwerk, Peter Wurz, Arno Wielders, Kazuo Yoshioka, Konrad Aleksiejuk, Fernando Alvarez, Carine Amoros, Shahid Aslam, Barbara Atamaniuk, Jędrzej Baran, Tomasz Barciński, Thomas Beck, Thomas Behnke, Martin Berglund, Ivano Bertini, Marcin Bieda, Piotr Binczyk, Martin-Diego Busch, Andrei Cacovean, Maria Teresa Capria, Chris Carr, José María Castro Marín, Matteo Ceriotti, Paolo Chioetto, Agata Chuchra-Konrad, Lorenzo Cocola, Fabrice Colin, Chiaki Crews, Victoria Cripps, Emanuele Cupido, Alberto Dassatti, Björn J. R. Davidsson, Thierry De Roche, Jan Deca, Simone Del Togno, Frederik Dhooghe, Kerri Donaldson Hanna, Anders Eriksson, Andrey Fedorov, Estela Fernández-Valenzuela, Stefano Ferretti, Johan Floriot, Fabio Frassetto, Jesper Fredriksson, Philippe Garnier, Dorota Gaweł, Vincent Génot, Thomas Gerber, Karl-Heinz Glassmeier, Mikael Granvik, Benjamin Grison, Herbert Gunell, Tedjani Hachemi, Christian Hagen, Rajkumar Hajra, Yuki Harada, Johann Hasiba, Nico Haslebacher, Miguel Luis Herranz De La Revilla, Daniel Hestroffer, Tilak Hewagama, Carrie Holt, Stubbe Hviid, Iaroslav Iakubivskyi, Laura Inno, Patrick Irwin, Stavro Ivanovski, Jiri Jansky, Irmgard Jernej, Harald Jeszenszky, Jaime Jimenéz, Laurent Jorda, Mihkel Kama, Shingo Kameda, Michael S. P. Kelley, Kamil Klepacki, Tomáš Kohout, Hirotsugu Kojima, Tomasz Kowalski, Masaki Kuwabara, Michal Ladno, Gunter Laky, Helmut Lammer, Radek Lan, Benoit Lavraud, Monica Lazzarin, Olivier Le Duff, Qiu-Mei Lee, Cezary Lesniak, Zoe Lewis, Zhong-Yi Lin, Tim Lister, Stephen Lowry, Werner Magnes, Johannes Markkanen, Ignacio Martinez Navajas, Zita Martins, Ayako Matsuoka, Barbara Matyjasiak, Christian Mazelle, Elena Mazzotta Epifani, Mirko Meier, Harald Michaelis, Marco Micheli, Alessandra Migliorini, Aude-Lyse Millet, Fernando Moreno, Stefano Mottola, Bruno Moutounaick, Karri Muinonen, Daniel R. Müller, Go Murakami, Naofumi Murata, Kamil Myszka, Shintaro Nakajima, Zoltan Nemeth, Artiom Nikolajev, Simone Nordera, Dan Ohlsson, Aire Olesk, Harald Ottacher, Naoya Ozaki, Christophe Oziol, Manish Patel, Aditya Savio Paul, Antti Penttilä, Claudio Pernechele, Joakim Peterson, Enrico Petraglio, Alice Maria Piccirillo, Ferdinand Plaschke, Szymon Polak, Frank Postberg, Herman Proosa, Silvia Protopapa, Walter Puccio, Sylvain Ranvier, Sean Raymond, Ingo Richter, Martin Rieder, Roberto Rigamonti, Irene Ruiz Rodriguez, Ondrej Santolik, Takahiro Sasaki, Rolf Schrödter, Katherine Shirley, Andris Slavinskis, Balint Sodor, Jan Soucek, Peter Stephenson, Linus Stöckli, Paweł Szewczyk, Gabor Troznai, Ludek Uhlir, Naoto Usami, Aris Valavanoglou, Jakub Vaverka, Wei Wang, Xiao-Dong Wang, Gaëtan Wattieaux, Martin Wieser, Sebastian Wolf, Hajime Yano, Ichiro Yoshikawa, Vladimir Zakharov, Tomasz Zawistowski, Paola Zuppella, Giovanna Rinaldi, Hantao Ji
    Space Science Reviews, 220(1), Jan 24, 2024  Peer-reviewed
    Abstract Here we describe the novel, multi-point Comet Interceptor mission. It is dedicated to the exploration of a little-processed long-period comet, possibly entering the inner Solar System for the first time, or to encounter an interstellar object originating at another star. The objectives of the mission are to address the following questions: What are the surface composition, shape, morphology, and structure of the target object? What is the composition of the gas and dust in the coma, its connection to the nucleus, and the nature of its interaction with the solar wind? The mission was proposed to the European Space Agency in 2018, and formally adopted by the agency in June 2022, for launch in 2029 together with the Ariel mission. Comet Interceptor will take advantage of the opportunity presented by ESA’s F-Class call for fast, flexible, low-cost missions to which it was proposed. The call required a launch to a halo orbit around the Sun-Earth L2 point. The mission can take advantage of this placement to wait for the discovery of a suitable comet reachable with its minimum $\varDelta $V capability of $600\text{ ms}^{-1}$. Comet Interceptor will be unique in encountering and studying, at a nominal closest approach distance of 1000 km, a comet that represents a near-pristine sample of material from the formation of the Solar System. It will also add a capability that no previous cometary mission has had, which is to deploy two sub-probes – B1, provided by the Japanese space agency, JAXA, and B2 – that will follow different trajectories through the coma. While the main probe passes at a nominal 1000 km distance, probes B1 and B2 will follow different chords through the coma at distances of 850 km and 400 km, respectively. The result will be unique, simultaneous, spatially resolved information of the 3-dimensional properties of the target comet and its interaction with the space environment. We present the mission’s science background leading to these objectives, as well as an overview of the scientific instruments, mission design, and schedule.
  • NAKAJIMA Shintaro, OZAKI Naoya, USAMI Naoto, SASAKI Takahiro, FUNASE Ryu
    Journal of Evolving Space Activities, 2 n/a, 2024  
    Comet Interceptor is ESA's F-class mission to explore a long-period comet. Comet Interceptor performs a flyby observation with 3 spacecraft: 1 main spacecraft (spacecraft A) and 2 small probes (probe B1 and probe B2). JAXA will provide one of the small probes, probe B1, taking advantage of its past achievements in micro spacecraft. The probe B1 is a micro spacecraft weighing about 35 kg. The bus size is about 24U, and the envelope including protrusions is about 50 cm cubic. This probe will carry three types of science instruments for complementary observations with ESA's instruments onboard the main spacecraft and another small probe at multiple points. The first instrument is a wide-angle camera and a narrow-angle camera (WAC/NAC) for optical observations of the nucleus. The second is Hydrogen Lyman-alpha Imager (HI) to observe a Lyman-alpha of coma, and the third is a Plasma Suite (PS) to observe plasma using an ion sensor and a magnetometer. The probe B1 performs a flyby observation without any commands from the ground, considering dust impacts during the closest approach to the comet. This paper presents the result of conceptual design for the small probe under severe constraints and its future challenges.
  • 深井 稜汰, 菊地 翔太, 久保 勇貴, 坂谷 尚哉, 嶌生 有理, 木村 駿太, 尾崎 直哉, 村上 豪
    日本惑星科学会誌遊星人, 32(4) 288-295, Dec, 2023  Peer-reviewed
  • Hiroyuki TOYOTA, Takeshi TAKASHIMA, Hiroshi IMAMURA, Kazutaka NISHIYAMA, Takayuki YAMAMOTO, Takeshi MIYABARA, Masayuki OHTA, Yoshitaka MOCHIHARA, Naoya OZAKI, Hiroyuki NAGAMATSU, Takakazu OKAHASHI, Junko TAKAHASHI, Toshiaki OKUDAIRA, Takayuki HIRAI, Masanori KOBAYASHI, Ko ISHIBASHI, Peng HONG, Osamu OKUDAIRA, Tomoko ARAI
    Journal of Evolving Space Activities, 1, Dec, 2023  Peer-reviewed
  • Naoya Ozaki, Ryuki Hyodo, Yuki Takao, Darryl Z. Seligman, Michael E. Brown, Sonia Hernandez, Makoto Yoshikawa, Masaki Fujimoto
    8th IAA Planetary Defense Conference, Apr, 2023  Lead authorCorresponding author
  • Naoya Ozaki, Takayuki Yamamoto, Ferran Gonzalez-Franquesa, Roger Gutierrez-Ramon, Nishanth Pushparaj, Takuya Chikazawa, Diogene Alessandro Dei Tos, Onur Çelik, Nicola Marmo, Yasuhiro Kawakatsu, Tomoko Arai, Kazutaka Nishiyama, Takeshi Takashima
    Acta Astronautica, 196 42-56, Jul, 2022  Peer-reviewedLead authorCorresponding author
  • Naoya Ozaki, Kenshiro Oguri, Ryu Funase
    The Journal of the Astronautical Sciences, Feb 4, 2022  Peer-reviewedLead authorCorresponding author
  • Naoya Ozaki, Kanta Yanagida, Takuya Chikazawa, Nishanth Pushparaj, Naoya Takeishi, Ryuki Hyodo
    Journal of Guidance, Control, and Dynamics, 2022  Peer-reviewedLead authorCorresponding author
  • Tomoki Nakamura, Hitoshi Ikeda, Toru Kouyama, Hiromu Nakagawa, Hiroki Kusano, Hiroki Senshu, Shingo Kameda, Koji Matsumoto, Ferran Gonzalez-Franquesa, Naoya Ozaki, Yosuke Takeo, Nicola Baresi, Yusuke Oki, David J. Lawrence, Nancy L. Chabot, Patrick N. Peplowski, Maria Antonietta Barucci, Eric Sawyer, Shoichiro Yokota, Naoki Terada, Stephan Ulamec, Patrick Michel, Masanori Kobayashi, Sho Sasaki, Naru Hirata, Koji Wada, Hideaki Miyamoto, Takeshi Imamura, Naoko Ogawa, Kazunori Ogawa, Takahiro Iwata, Takane Imada, Hisashi Otake, Elisabet Canalias, Laurence Lorda, Simon Tardivel, Stephane Mary, Makoto Kunugi, Seiji Mitsuhashi, Alain Doressoundiram, Frederic Merlin, Sonia Fornasier, Jean-Michel Reess, Pernelle Bernardi, Shigeru Imai, Yasuyuki Ito, Hatsumi Ishida, Kiyoshi Kuramoto, Yasuhiro Kawakatsu
    EARTH PLANETS AND SPACE, 73(1), Dec, 2021  
  • Takuya Chikazawa, Nicola Baresi, Stefano Campagnola, Naoya Ozaki, Yasuhiro Kawakatsu
    Acta Astronautica, 180 679-692, Mar, 2021  
  • Naoya Ozaki, Stefano Campagnola, Ryu Funase
    Journal of Guidance, Control, and Dynamics, 43(4) 645-655, Mar, 2020  Peer-reviewedLead authorCorresponding author
    Recent low-thrust space missions have highlighted the importance of designing trajectories that are robust against uncertainties. In its complete form, this process is formulated as a nonlinear constrained stochastic optimal control problem. This problem is among the most complex in control theory, and no practically applicable method to low-thrust trajectory optimization problems has been proposed to date. This paper presents a new algorithm to solve stochastic optimal control problems with nonlinear systems and constraints. The proposed algorithm uses the unscented transform to convert a stochastic optimal control problem into a deterministic problem, which is then solved by trajectory optimization methods such as differential dynamic programming. Two numerical examples, one of which applies the proposed method to low-thrust trajectory design, illustrate that it automatically introduces margins that improve robustness. Finally, Monte Carlo simulations are used to evaluate the robustness and optimality of the solution.
  • Pablo Machuca, Naoya Ozaki, Joan Pau Sánchez, Leonard Felicetti, Ryu Funase
    Proceedings of the International Astronautical Congress, IAC, 2020-, 2020  
  • Kanta Yanagida, Naoya Ozaki, Ryu Funase
    AIAA Scitech 2020 Forum, 1, 2020  
  • Kota Kakihara, Naoya Ozaki, Akihiro Ishikawa, Takuya Chikazawa, Ryu Funase
    AIAA Scitech 2020 Forum, 1, 2020  
  • Rei Kawashima, Willem Herman Steyn, Naoya Ozaki, Ryu Funase, Munetaka Ueno, Rainer Sandau, Chris Welch, Yukihito Kitazawa, Shinichi Nakasuka
    Proceedings of the International Astronautical Congress, IAC, 2020-October, 2020  
  • Yasuhiro Kawakatsu, Kiyoshi Kuramoto, Tomohiro Usui, Hitoshi Ikeda, Kent Yoshikawa, Hirotaka Sawada, Naoya Ozaki, Takane Imada, Hisashi Otake, Kenichiro Maki, Masatsugu Otsuki, Robert Muller, Kris Zacny, Yasutaka Satoh, Stephane Mary, Markus Grebenstein, Ayumu Tokaji, Liang Yuying, Ferran Gonzalez Franquesa, Nishanth Pushparaj, Takuya Chikazawa
    Proceedings of the International Astronautical Congress, IAC, 2020-October, 2020  
  • Diogene A. Dei Tos, Takayuki Yamamoto, Naoya Ozaki, Yu Tanaka, Ferran Gonzalez-Franquesa, Nishanth Pushparaj, Onur Celik, Takeshi Takashima, Kazutaka Nishiyama, Yasuhiro Kawakatsu
    AIAA Scitech 2020 Forum, 1 PartF, 2020  
  • Naoya Ozaki, Takuya Chikazawa, Kota Kakihara, Akihiro Ishikawa, Yasuhiro Kawakatsu
    Journal of Spacecraft and Rockets, 1 PartF, 2020  Peer-reviewedLead author
  • Kenshiro Oguri, Kenta Oshima, Stefano Campagnola, Kota Kakihara, Naoya Ozaki, Nicola Baresi, Yasuhiro Kawakatsu, Ryu Funase
    JOURNAL OF THE ASTRONAUTICAL SCIENCES, 67(3) 950-976, Jan, 2020  Peer-reviewed
  • Ryu Funase, Satoshi Ikari, Kota Miyoshi, Yosuke Kawabata, Shintaro Nakajima, Shunichiro Nomura, Nobuhiro Funabiki, Akihiro Ishikawa, Kota Kakihara, Shuhei Matsushita, Ryohei Takahashi, Kanta Yanagida, Daiko Mori, Yusuke Murata, Toshihiro Shibukawa, Ryo Suzumoto, Masahiro Fujiwara, Kento Tomita, Hiroki Aohama, Keidai Iiyama, Sho Ishiwata, Hirotaka Kondo, Wataru Mikuriya, Hiroto Seki, Hiroyuki Koizumi, Jun Asakawa, Keita Nishii, Akihiro Hattori, Yuji Saito, Kosei Kikuchi, Yuta Kobayashi, Atsushi Tomiki, Wataru Torii, Taichi Ito, Stefano Campagnola, Naoya Ozaki, Nicola Baresi, Ichiro Yoshikawa, Kazuo Yoshioka, Masaki Kuwabara, Reina Hikida, Shogo Arao, Shinsuke Abe, Masahisa Yanagisawa, Ryota Fuse, Yosuke Masuda, Hajime Yano, Takayuki Hirai, Kazuyoshi Arai, Ritsuko Jitsukawa, Eigo Ishioka, Haruki Nakano, Toshinori Ikenaga, Tatsuaki Hashimoto
    IEEE Aerospace & Electro. Systems Magazine, Nov, 2019  Peer-reviewed
  • 尾崎 直哉, 山本 高行, ディトス・ディオジェネ, 佐藤 峻介, セリク・オヌル, ゴンサレス・ファラン, プシュパラジ・ニシャント, 田中 悠, 藤原 航太郎, 町井 佳菜子, 岡本 丈, 北出 知也, 近澤 拓弥, 川勝 康弘
    第63回宇宙科学技術連合講演会, Oct, 2019  Lead author
  • Ryu Funase, Satoshi Ikari, Yosuke Kawabata, Shintaro Nakajima, Shunichiro Nomura, Kota Kakihara, Ryohei Takahashi, Kanta Yanagida, Shuhei Matsushita, Akihiro Ishikawa, Nobuhiro Funabiki, Yusuke Murata, Ryo Suzumoto, Toshihiro Shibukawa, Daiko Mori, Masahiro Fujiwara, Kento Tomita, Hiroyuki Koizumi, Jun Asakawa, Keita Nishii, Ichiro Yoshikawa, Kazuo Yoshioka, Takayuki Hirai, Shinsuke Abe, Ryota Fuse, Masahisa Yanagisawa, Kota Miyoshi, Yuta Kobayashi, Atsushi Tomiki, Wataru Torii, Taichi Ito, Masaki Kuwabara, Hajime Yano, Naoya Ozaki, Toshinori Ikenaga, Tatsuaki Hashimoto
    33rd Annual AIAA/USU Conference on Small Satellites, SSC18(VII-05) 1-5, Aug 3, 2019  Peer-reviewed
  • Stefano Campagnola, Javier Hernando-Ayuso, Kota Kakihara, Yosuke Kawabata, Takuya Chikazawa, Ryu Funase, Naoya Ozaki, Nicola Baresi, Tatsuaki Hashimoto, Yasuhiro Kawakatsu, Toshinori Ikenaga, Kenshiro Oguri, Kenta Oshima
    IEEE AEROSPACE AND ELECTRONIC SYSTEMS MAGAZINE, 34(4) 38-44, Apr, 2019  Peer-reviewed
  • Naoya Ozaki, Stefano Campagnola, Ryu Funase
    Advances in the Astronautical Sciences, 168 281-300, 2019  
  • Kota Kakihara, Naoya Ozaki, Ryu Funase, Shinichi Nakasuka
    Advances in the Astronautical Sciences, 168 4015-4026, 2019  
  • Kanta Yanagida, Naoya Ozaki, Ryu Funase
    Advances in the Astronautical Sciences, 168 301-318, 2019  
  • Takayuki Yamamoto, Naoya Ozaki, Diogene Alessandro Dei Tos, Onur Celik, Yu Tanaka, Ferran Gonzalez-Franquesa, Yasuhiro Kawakatsu
    Proceedings of the International Astronautical Congress, IAC, 2019-October, 2019  
  • Takuya Chikazawa, Nicola Baresi, Naoya Ozaki, Stefano Campagnola, Yasuhiro Kawakatsu
    Advances in the Astronautical Sciences, 168 653-667, 2019  
  • Takuya Chikazawa, Nicola Baresi, Naoya Ozaki, Stefano Campagnola, Yasuhiro Kawakatsu
    SPACEFLIGHT MECHANICS 2019, VOL 168, PTS I-IV, 168 653-667, 2019  
  • Kota Kakihara, Naoya Ozaki, Ryu Funase, Shinichi Nakasuka
    SPACEFLIGHT MECHANICS 2019, VOL 168, PTS I-IV, 168 4015-4026, 2019  Peer-reviewed
  • Kanta Yanagida, Naoya Ozaki, Ryu Funase
    SPACEFLIGHT MECHANICS 2019, VOL 168, PTS I-IV, 168 301-318, 2019  Peer-reviewed
  • Naoya Ozaki, Stefano Campagnola, Ryu Funase
    SPACEFLIGHT MECHANICS 2019, VOL 168, PTS I-IV, 168 281-300, 2019  Peer-reviewedLead author
  • 49 8p, Apr 19, 2018  
  • Naoya Ozaki
    the University of Tokyo, Mar, 2018  Peer-reviewed
  • Naoya Ozaki, Stefano Campagnola, Ryu Funase, Chit Hong Yam
    JOURNAL OF GUIDANCE CONTROL AND DYNAMICS, 41(2) 377-387, Feb, 2018  Peer-reviewed
  • Stefano Campagnola, Javier Hernando-Ayuso, Kota Kakihara, Yosuke Kawabata, Takuya Chikazawa, Ryu Funase, Naoya Ozaki, Nicola Baresi, Tatsuaki Hashimoto, Yasuhiro Kawakatsu, Toshinori Ikenaga, Kenshiro Oguri, Kenta Oshima
    Proceedings of the International Astronautical Congress, IAC, 2018-October, 2018  
  • Naoya Ozaki, Ryu Funase
    AIAA Guidance, Navigation, and Control Conference, 2018, (210039), Jan 1, 2018  Peer-reviewed
  • Yasuhiro Kawakatsu, Kiyoshi Kuramoto, Tomohiro Usui, Hitoshi Ikeda, Naoya Ozaki, Nicola Baresi, Go Ono, Takane Imada, Takanobu Shimada, Hiroki Kusano, Hirotaka Sawada, Takashi Ozawa, Mitsuhisa Baba, Hisashi Otake
    Proceedings of the International Astronautical Congress, IAC, 2018-October, 2018  Peer-reviewed
  • KOSHIRO Yuki, OZAKI Naoya, FUNASE Ryu, NAKASUKA Shinichi
    JOURNAL OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, 65(6) 219-226, 2017  Peer-reviewed
    Earth observation satellites can improve the flexibility of observation sites by having “maneuverability,” and low-thrust obtained by ion thruster will be a promising method for orbital change for micro-satellites. Designing low-thrust trajectories for these satellites is a multi-revolution and multi-objective (time/fuel-optimal) optimization problem, which usually requires high computational cost to solve numerically. This paper derives an analytical and approximate optimal orbit change strategy between two circular orbits with the same semi-major axis and different local time of ascending node, and proposes a graph-based method to optimize the multi-objective criteria. The optimal control problem results in a problem to search a switching point on the proposed graph, and mission designers can design an approximate switching point on this graph, by using two heuristic and reasonable assumptions that 1) the optimal thrust direction should be tangential to orbit and 2) the optimal thrust magnitude should be bang-bang control with an intermediate coast. Finally, numerical simulation with feedback control algorithm taking thrust margin demonstrates that the proposed method can be applicable in the presence of deterministic and stochastic fluctuation of aerodynamic disturbances.
  • Naoya Ozaki, Yosuke Kawabata, Hiroshi Takeuchi, Tsutomu Ichikawa, Ryu Funase, Yasuhiro Kawakatsu
    SICE Journal of Control, Measurement, and System Integration, 10(3) 192-197, 2017  Peer-reviewed
  • 船瀬龍, 三好航太, 五十里哲, 川端洋輔, 尾崎直哉, 中島晋太郎, 小栗健士朗, 神代優季, 友岡雅志, 野村俊一郎, 和地瞭良, 工藤匠, 石川晃寛, 柿原浩太, 高橋亮平, 柳田幹太, 船曳敦漠, 松下周平, 井倉幹大, 小泉宏之, 浅川純, 小林雄太, 冨木淳史, 伊藤大智, 吉川一朗, 矢野創, 阿部新助, 橋本樹明
    宇宙科学技術連合講演会講演集(CD-ROM), 61st ROMBUNNO.3G04, 2017  
  • Naoya Ozaki, Yosuke Kawabata, Hiroshi Takeuchi, Tsutomu Ichikawa, Sho Taniguchi, Tomoko Yagami, Ryu Funase, Yasuhiro Kawakatsu
    2016 55th Annual Conference of the Society of Instrument and Control Engineers of Japan, SICE 2016, 654-659, Nov 18, 2016  Peer-reviewed
  • 60 6p, Sep 6, 2016  
  • 60 6p, Sep 6, 2016  
  • Naoya Ozaki, Ryu Funase, Stefano Campagnola
    第60回宇宙科学技術連合講演会, Sep, 2016  

Misc.

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Professional Memberships

 2

Major Works

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Major Research Projects

 9
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Media Coverage

 3
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