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Commentary : Contributing to the SpaceWire international standard (H. HIHARA et al.)−155−Synthesiology - English edition Vol.11 No.3 (2018) Committee, participated in the Operating Committee as a representative of Japan, and led Japanese technological proposal activities to the SpaceWire international standard.Takayuki TAKAHASHIProfessor, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA-ISAS) until February 15, 2018. Currently, Professor, Kavli Institute for the Physics and Mathematics of the Universe (Kavli-IPMU), the University of Tokyo. Oversees development of common data bus utilizing the SpaceWire international standard in Japan and supervises overall international standardization activities. In this article, created the R&D plan in linkage with proposals for international standard and future prospect of data handling system in scientific satellites, built the framework of international collaboration, and led overall R&D for data handling systems to be installed on satellites.351 (2011).[12]T. Yuasa, T. Takahashi, M. Nomachi and H. Hihara: ASpaceWire router architecture with non-blocking packettransfer mechanism, Proc. Intl. SpaceWire Conference 2014,213–219 (2014).[13]T. Takahashi, Y. Kasaba, K. Takashima, T. Yoshimitsuand T. Yamada: Kagaku eisei data shorikei no shorai tenbo(Future prospect of scientic satellite data handling system),Proceedings of the Space Science Symposium (2005) (inJapanese).[14]ASTRO-H Project Team, Institute of Space andAstronautical Science, JAXA: 8-2 SpaceWire Network –Network type satellite architecture, X sen tenmon eiseiASTRO-H jikken hokokusho (Experimental report forx-ray astronomical satellite ASTRO-H), 812–883 (2016) (inJapanese).[15]European Space Agency: WELL CONNECTED, EuropeanSpace Agency Bulletin (2011).[16]H. Hihara, S. Moriyama, T. Tamura, T. Tohma, K. Kitade,S.Parkes, S. Mills, M. Nomachi, T. Takahashi and T.Takashima: SpaceWire protocol analyzer on Space Cube,Proc. Intl. SpaceWire Conference 2007, 249–252 (2007).[17]T. Yamada: Results of analysis for the SpW-D draftspecication, 15th SpaceWire Working Group (2010).[18]Space Technology Centre, University of Dundee:SpaceWire-D—deterministic control and data delivery overSpaceWire networks, revision: draft B (2010).[19]M. Takada, Y. Chen, H. Takada, T. Yuasa, T. Takahashiand M. Nomachi: SpaceWire no real time sei hosho shuhono kento to software platform no kaihatsu (Investigation ofmethod for maintaining real time property of SpaceWire andthe development of software platform), Proceedings of the13th Space Science Symposium (2013) (in Japanese).[20]SciSys UK Ltd.: Network discovery protocols, protocolspecication, SpaceWire plug-and-play protocol, reference,SSL/08717/DOC/003, Issue: 1.5 (2013).AuthorsHiroki HIHARAJoined NEC Corporation in 1986; also started working at NEC Space Technologies, Ltd. in 2015. Oversees development of network and image processing system for satellites. In this article, worked on negotiations to reflect technological proposals from Japan in the SpaceWire international standard, and oversaw practical development of onboard data handling subsystems for satellites to which the SpaceWire international standard was applied.Masaharu NOMACHIProfessor, Laboratory of Nuclear Studies, Osaka University until September 30, 2011. Currently, Professor, Institute of Radiation Sciences, Osaka University. Oversees technological proposals from Japan for the international standard at the SpaceWire Working Group Committee and is the supervisor for the development of SpaceWire onboard sub-network design standard at the Japan Aerospace Exploration Agency (JAXA). In this article, oversaw Japanese participants in the SpWWG Discussions with Reviewers1 OverallComment (Akira Ono and Motoyuki Akamatsu, AIST)For the international standardization of SpaceWire that is the communication standard for onboard satellite networks, the scenario by which the Japanese proposal was adopted is described from the technological background and the roles of people involved. The Yoshikawa model was applied for the development-type standard establishment, and analysis is done for the behavior patterns of European, American, and Japanese practitioners of standard establishment. This process can generally be applied to any standard development, not limited to the satellite communication standard, and therefore this article is appropriate for publication in Synthesiology.2 Range and role of the participants in standard establishmentQuestion (Akira Ono)So-called international standards include ISO and IEC, and the international standards are created by agreement among the standardization institutions of various countries. For the SpaceWire international standard, the main subject of this article, what kind of people and organizations were involved and agreed to create this international standard? I imagine that the space technology specialists from around the world, space agencies of various countries, ESA, and others were involved, but which entities played what roles in creating the SpaceWire international standard?Answer (Hiroki Hihara)SpaceWire was originally proposed by the European Space Agency/European Space Research and Technology Centre (ESA/ESTEC). It started this investigation with the objective of creating a standard for inter-device communication onboard spacecraft without using special parts for military use that were conventionally used in spacecraft. International standards are established within ESA by the Technical Committee (TC) that is part of ESTEC. However, prior to the establishing process at the TC, the SpaceWire Working Group Committee (SpW WG) was set up to take the role of discussing specications and then submitting the specs to the TC.There is no restriction to the qualifications to participate in the SpW WG. People of any country, regardless of whether they belong to government, academia, or industry can participate.

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