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7 results on '"Toyoshima Morio"'

1. Development of Advanced HTS Onboard Ka-band Antennas for Engineering Test Satellite 9

Author

Kusano Masaaki, Tsuji Hiroyuki, Kanasashi Arimasa, Yoshimura Naoko, Okawa Mitsugu, Abe Yuma, Orikasa Teruaki, Tanaka Tai, Toyoshima Morio, Sunaga Terumi, Morikawa Eihisa, Tsunoda Toshiyasu, Miura Amane, Uchida Shigeru, Horie Nobuyoshi, Sakai Eiichi, Okura Takuya, and Takahashi Takashi

Subjects
business.industry, Computer science, Astrophysics::Instrumentation and Methods for Astrophysics, Electrical engineering, Spectral efficiency, Communications system, High-throughput satellite, Ka band, Satellite, Antenna (radio), business, Throughput (business), Beam (structure), Computer Science::Information Theory
Abstract

We have developed the advanced onboard antennas for High Throughput Satellite (HTS). They are three types of the antennas utilizing Ka-band frequencies to aim in-orbit verification by the Japanese Engineering Test Satellite 9 (ETS-9). First antenna is the fixed multi-beam antenna (Fixed MBA) employing the miniaturized and integrated feeder unit to enable dense allocation of multi beams for improvement of spectrum efficiency. Second antenna is the Digital Beam Forming antenna (DBF-ANT) to enable flexible beam shape. Third antenna is the common communications system antenna (CCS-ANT) transmitting broad beam which has beacon transmission function etc.

Published
2021
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2. Satellite-to-ground quantum communication using a 50-kg-class micro-satellite

Author

Takenaka, Hideki, Carrasco-Casado, Alberto, Fujiwara, Mikio, Kitamura, Mitsuo, Sasaki, Masahide, and Toyoshima, Morio

Subjects
Quantum Physics, FOS: Physical sciences, Quantum Physics (quant-ph), Physics - Optics, Optics (physics.optics)
Abstract

Recent rapid growth in the number of satellite-constellation programs for remote sensing and communications, thanks to the availability of small-size and low-cost satellites, provides impetus for high capacity laser communication (lasercom) in space. Quantum communication can enhance the overall performance of lasercom, and also enables intrinsically hack-proof secure communication known as Quantum Key Distribution (QKD). Here, we report a quantum communication experiment between a micro-satellite (48 kg and 50 cm cube) in a low earth orbit and a ground station with single-photon counters. Non-orthogonal polarization states were transmitted from the satellite at a 10-MHz repetition rate. On the ground, by post-processing the received quantum states at an average of 0.14 photons/pulse, clock data recovery and polarization reference-frame synchronization were successfully done even under remarkable Doppler shifts. A quantum bit error rate below 5% was measured, demonstrating the feasibility of quantum communication in a real scenario from space., Comment: 12 pages, 5 figures. Published in Nature Photonics (2017), http://www.nature.com/nphoton/journal/vaop/ncurrent/full/nphoton.2017.107.html

Published
2017
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3. Laser Data Downlink System of Micro-satellite RISESAT

Author

Kuwahara, Toshinori, Yoshida, Kazuya, Tomioka, Yoshihiro, Fukuda, Kazufumi, Kunimori, Hiroo, Toyoshima, Morio, Fuse, Tetsuharu, Kubooka, Toshihiro, Kurihara, Junichi, and Takahashi, Yukihiro

Abstract

Tohoku University is developing a 50kg-class international scientific microsatellite named RISESAT. In addition to various scientific instruments including a 5m GSD multi-spectral high-precision Cassegrain telescope (HPT), RISESAT is also equipped with a laser communication terminal VSOTA, developed by Japanese National Institute of Information and Communications Technology (NICT) as technology demonstration mission. VSOTA stands for Very Small Optical Transmitter for Component Validation, which is a dual-band (980nm/1550nm) laser signal transmitter without gimbal mechanism or internal fine pointing mechanism. RISESAT aims to demonstrate satellite-to-ground laser communication by means of accurate attitude control of the satellite body, i.e. the direction of the laser beams fixed to the satellite structure, with an attitude control accuracy of down to 0.04 deg (3σ). Moreover, it is planned that the HPT is utilized to determine the direction of the pilot signal sent from the ground station, which can be fed back to the attitude control system for achieving higher control accuracy. The desired maximum bitrate for this mission is 1 Mbps. The NICT’s 1.5m diameter optical ground station is the primary ground station, supported by 0.3m diameter mobile optical ground stations. This is the first step toward the establishment of future optical communication infrastructures.

Published
2013

4. Updating Quantum Cryptography Report ver. 1

Author

Dodson, Donna, Fujiwara, Mikio, Grangier, Philippe, Hayashi, Masahito, Imafuku, Kentaro, Kitayama, Ken-ichi, Kumar, Prem, Kurtsiefer, Christian, Lenhart, Gaby, Luetkenhaus, Norbert, Matsumoto, Tsutomu, Munro, William J., Nishioka, Tsuyoshi, Peev, Momtchil, Sasaki, Masahide, Sata, Yutaka, Takada, Atsushi, Takeoka, Masahiro, Tamaki, Kiyoshi, Tanaka, Hidema, Tokura, Yasuhiro, Tomita, Akihisa, Toyoshima, Morio, van Meter, Rodney, Yamagishi, Atsuhiro, Yamamoto, Yoshihisa, and Yamamura, Akihiro

Subjects
FOS: Computer and information sciences, Quantum Physics, Computer Science - Cryptography and Security, FOS: Physical sciences, Quantum Physics (quant-ph), Cryptography and Security (cs.CR)
Abstract

Quantum cryptographic technology (QCT) is expected to be a fundamental technology for realizing long-term information security even against as-yet-unknown future technologies. More advanced security could be achieved using QCT together with contemporary cryptographic technologies. To develop and spread the use of QCT, it is necessary to standardize devices, protocols, and security requirements and thus enable interoperability in a multi-vendor, multi-network, and multi-service environment. This report is a technical summary of QCT and related topics from the viewpoints of 1) consensual establishment of specifications and requirements of QCT for standardization and commercialization and 2) the promotion of research and design to realize New-Generation Quantum Cryptography., Comment: 74 pages

Published
2009
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5. DECIGO pathfinder

Author

Ando, Masaki, Kawamura, Seiji, Nakamura, Takashi, Tsubono, Kimio, Tanaka, Takahiro, Funaki, Ikkoh, Seto, Naoki, Numata, Kenji, Sato, Shuichi, Ioka, Kunihito, Kanda, Nobuyuki, Takashima, Takeshi, Agatsuma, Kazuhiro, Akutsu, Tomotada, Akutsu, Tomomi, Aoyanagi, Koh-suke, Arai, Koji, Arase, Yuta, Araya, Akito, Asada, Hideki, Aso, Yoichi, Chiba, Takeshi, Ebisuzaki, Toshikazu, Enoki, Motohiro, Eriguchi, Yoshiharu, Fujimoto, Masa-Katsu, Fujita, Ryuichi, Fukushima, Mitsuhiro, Futamase, Toshifumi, Ganzu, Katsuhiko, Harada, Tomohiro, Hashimoto, Tatsuaki, Hayama, Kazuhiro, Hikida, Wataru, Himemoto, Yoshiaki, Hirabayashi, Hisashi, Hiramatsu, Takashi, Hong, Feng-Lei, Horisawa, Hideyuki, Hosokawa, Mizuhiko, Ichiki, Kiyotomo, Ikegami, Takashi, Inoue, Kaiki T., Ishidoshiro, Koji, Ishihara, Hideki, Ishikawa, Takehiko, Ishizaki, Hideharu, Ito, Hiroyuki, Itoh, Yousuke, Kamagasako, Shogo, Kawashima, Nobuki, Kawazoe, Fumiko, Kirihara, Hiroyuki, Kishimoto, Naoko, Kiuchi, Kenta, Kobayashi, Shiho, Kohri, Kazunori, Koizumi, Hiroyuki, Kojima, Yasufumi, Kokeyama, Keiko, Kokuyama, Wataru, Kotake, Kei, Kozai, Yoshihide, Kudoh, Hideaki, Kunimori, Hiroo, Kuninaka, Hitoshi, Kuroda, Kazuaki, Maeda, Kei-ichi, Matsuhara, Hideo, Mino, Yasushi, Miyakawa, Osamu, Miyoki, Shinji, Morimoto, Mutsuko Y., Morioka, Tomoko, Morisawa, Toshiyuki, Moriwaki, Shigenori, Mukohyama, Shinji, Musha, Mitsuru, Nagano, Shigeo, Naito, Isao, Nakagawa, Noriyasu, Nakamura, Kouji, Nakano, Hiroyuki, Nakao, Kenichi, Nakasuka, Shinichi, Nakayama, Yoshinori, Nishida, Erina, Nishiyama, Kazutaka, Nishizawa, Atsushi, Niwa, Yoshito, Ohashi, Masatake, Ohishi, Naoko, Ohkawa, Masashi, Okutomi, Akira, Onozato, Kouji, Oohara, Kenichi, Sago, Norichika, Saijo, Motoyuki, Sakagami, Masaaki, Sakai, Shin-ichiro, Sakata, Shihori, Sasaki, Misao, Sato, Takashi, Shibata, Masaru, Shinkai, Hisaaki, Somiya, Kentaro, Sotani, Hajime, Sugiyama, Naoshi, Suwa, Yudai, Tagoshi, Hideyuki, Takahashi, Kakeru, Takahashi, Keitaro, Takahashi, Tadayuki, Takahashi, Hirotaka, Takahashi, Ryuichi, Takahashi, Ryutaro, Takamori, Akiteru, Takano, Tadashi, Taniguchi, Keisuke, Taruya, Atsushi, Tashiro, Hiroyuki, Tokuda, Mitsuru, Tokunari, Masao, Toyoshima, Morio, Tsujikawa, Shinji, Tsunesada, Yoshiki, Ueda, Ken-ichi, Utashima, Masayoshi, Yamakawa, Hiroshi, Yamamoto, Kazuhiro, Yamazaki, Toshitaka, Yokoyama, Jun'ichi, Yoo, Chul-Moon, Yoshida, Shijun, and Yoshino, Taizoh

Subjects
History, Computer Science Applications, Education
Abstract

DECIGO pathfinder (DPF) is a milestone satellite mission for DECIGO (DECi-hertz Interferometer Gravitational wave Observatory) which is a future space gravitational wave antenna. DECIGO is expected to provide us fruitful insights into the universe, in particular about dark energy, a formation mechanism of supermassive black holes, and the inflation of the universe. Since DECIGO will be an extremely large mission which will formed by three drag-free spacecraft with 1000m separation, it is significant to gain the technical feasibility of DECIGO before its planned launch in 2024. Thus, we are planning to launch two milestone missions: DPF and pre-DECIGO. The conceptual design and current status of the first milestone mission, DPF, are reviewed in this article.

Published
2008

7. The Japanese space gravitational wave antenna: DECIGO

Author

Chen, Dan, Hong, Feng-Lei, Ichiki, Kiyotomo, Ikegami, Takeshi, Inoue, Kaiki T., Ishidoshiro, Koji, Ishihara, Hideki, Ishizaki, Hideharu, Ito, Hiroyuki, Itoh, Yousuke, Izumi, Kiwamu, Kawashima, Nobuki, Kawazoe, Fumiko, Kishimoto, Naoko, Kiuchi, Kenta, Kobayashi, Shiho, Kohri, Kazunori, Kojima, Yasufumi, Kokeyama, Keiko, Kokuyama, Wataru, Kotake, Kei, Kozai, Yoshihide, Kunimori, Hiroo, Kuroda, Kazuaki, Kuroyanagi, Sachiko, Maeda, Kei-ichi, Matsumoto, Nobuyuki, Michimura, Yuta, Miyakawa, Osamu, Miyamoto, Umpei, Miyoki, Shinji, Morisawa, Toshiyuki, Moriwaki, Shigenori, Mukohyama, Shinji, Musha, Mitsuru, Nagano, Shigeo, Naito, Isao, Nakamura, Kouji, Nakano, Hiroyuki, Nakao, Kenichi, Nakasuka, Shinichi, Nakayama, Yoshinori, Nakazawa, Kazuhiro, Nishida, Erina, Nishizawa, Atsushi, Niwa, Yoshito, Noumi, Taiga, Obuchi, Yoshiyuki, Ohashi, Masatake, Ohishi, Naoko, Ohkawa, Masashi, Okada, Kenshi, Okada, Norio, Oohara, Kenichi, Sago, Norichika, Saijo, Motoyuki, Saito, Ryo, Sakagami, Masaaki, Sakata, Shihori, Sasaki, Misao, Sato, Takashi, Shibata, Masaru, Shinkai, Hisaaki, Shoda, Ayaka, Somiya, Kentaro, Sotani, Hajime, Sugiyama, Naoshi, Suwa, Yudai, Suzuki, Rieko, Tagoshi, Hideyuki, Takahashi, Fuminobu, Takahashi, Kakeru, Takahashi, Keitaro, Takahashi, Ryutaro, Takahashi, Ryuichi, Takahashi, Hirotaka, Akiteru, Takamori, Takano, Tadashi, Tanaka, Nobuyuki, Taniguchi, Keisuke, Taruya, Atsushi, Tashiro, Hiroyuki, Torii, Yasuo, Toyoshima, Morio, Tsujikawa, Shinji, Tsunesada, Yoshiki, Ueda, Akitoshi, Ueda, Ken-ichi, Wakabayashi, Yaka, Yagi, Kent, Yamakawa, Hiroshi, Yamamoto, Kazuhiro, Yamazaki, Toshitaka, Yoo, Chul-Moon, Yoshida, Shijun, Yoshino, Taizoh, Sun, Ke-Xun, Kawamura, Seiji, Ando, Masaki, Seto, Naoki, Sato, Shuichi, Nakamura, Takashi, Tsubono, Kimio, Kanda, Nobuyuki, Tanaka, Takahiro, Yokoyama, Jun'ichi, Funaki, Ikkoh, Numata, Kenji, Ioka, Kunihito, Takashima, Takeshi, Agatsuma, Kazuhiro, Akutsu, Tomotada, Aoyanagi, Koh-suke, Arai, Koji, Araya, Akito, Asada, Hideki, Aso, Yoichi, Chiba, Takeshi, Ebisuzaki, Toshikazu, Ejiri, Yumiko, Enoki, Motohiro, Eriguchi, Yoshiharu, Fujimoto, Masa-Katsu, Fujita, Ryuichi, Fukushima, Mitsuhiro, Futamase, Toshifumi, Harada, Tomohiro, Hashimoto, Tatsuaki, Hayama, Kazuhiro, Hikida, Wataru, Himemoto, Yoshiaki, Hirabayashi, Hisashi, Hiramatsu, Takashi, Horisawa, Hideyuki, Hosokawa, Mizuhiko, Ishikawa, Takehiko, Kawano, Isao, Koizumi, Hiroyuki, Kuninaka, Hitoshi, Matsuhara, Hideo, Morimoto, Mutsuko Y., Nishiyama, Kazutaka, Sakai, Shin-ichiro, Takahashi, Tadayuki, and Utashima, Masayoshi

Subjects
Physics, Optics, Physics and Astronomy (miscellaneous), Gravitational wave, business.industry, Big Bang Observer, Antenna (radio), Space (mathematics), business
Abstract

著者人数: 145名, 資料番号: SA1002921000

Published
2011
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