{"created":"2023-06-20T14:43:15.020260+00:00","id":10542,"links":{},"metadata":{"_buckets":{"deposit":"5bd6502b-fa5e-41f8-931b-d84e2db88aa0"},"_deposit":{"created_by":1,"id":"10542","owners":[1],"pid":{"revision_id":0,"type":"depid","value":"10542"},"status":"published"},"_oai":{"id":"oai:jaxa.repo.nii.ac.jp:00010542","sets":["1543:1580:1589","1887:1891"]},"author_link":["87839","87854","87847","87853","87845","87855","87851","87843","87850","87848","87842","87844","87852","87856","87857","87846","87840","87849","87841","87858"],"item_5_alternative_title_2":{"attribute_name":"その他のタイトル（英）","attribute_value_mlt":[{"subitem_alternative_title":"Development of ASTRO-G front-end part: Fabrication of EM and performance evaluation"}]},"item_5_biblio_info_10":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2010-01","bibliographicIssueDateType":"Issued"},"bibliographicVolumeNumber":"10","bibliographic_titles":[{"bibliographic_title":"宇宙科学シンポジウム: 講演集録"},{"bibliographic_title":"Proceedings of the Space Science Symposium","bibliographic_titleLang":"en"}]}]},"item_5_description_14":{"attribute_name":"会議概要（会議名, 開催地, 会期, 主催者等）","attribute_value_mlt":[{"subitem_description":"第10回宇宙科学シンポジウム (2010年1月7日-8日. 宇宙航空研究開発機構宇宙科学研究本部)","subitem_description_type":"Other"}]},"item_5_description_15":{"attribute_name":"会議概要（会議名, 開催地, 会期, 主催者等）（英）","attribute_value_mlt":[{"subitem_description":"10th Space Science Symposium (January 7-8, 2010. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)), Sagamihara, Kanagawa Japan","subitem_description_type":"Other"}]},"item_5_description_16":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"ASTRO‐G/VSOP2衛星に搭載される8/22/43GHz帯フロントエンド(電波受信機)EM製作とRF性能試験の結果を報告する。同衛星のフロントエンド部は、観測周波数帯(8/22/43 GHz)毎に独立しており、軌道上での運用時は22/43GHz帯は冷凍機により30K(LNA)および100K(ホーン)まで冷却することで熱雑音を抑える設計である。2008年度にはEMの各構成要素単体での環境試験および性能測定を経て、2008年10月から2009年2月までフロントエンド系を通してのRF性能試験を行なった。22/43 GHz帯については、宇宙科学研究本部内の実験室に整備された冷却真空デュワーの内部にフロントエンド系を組み込み、ヒーターを用いて温度制御することで上記の運用環境を模擬した。測定内容は、振動試験前後における、受信機雑音温度、周波数帯域特性、ビームパターン等である。Y‐Factor法による測定の結果、上記の運用時の温度環境において22GHz帯で約40K、43GHz帯で約60Kの受信機雑音温度が得られた。これはASTRO‐G衛星の目標値を満たすものであり、現在の設計でミッション要求通りの仕様を達成できることが確認された。さらにLNAにおける環境温度に対する受信機雑音温度の依存性を測定し、冷却により雑音温度が抑えられることが確かめられた。","subitem_description_type":"Abstract"}]},"item_5_description_18":{"attribute_name":"内容記述","attribute_value_mlt":[{"subitem_description":"形態: 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(JAXA)"}]},"item_5_text_6":{"attribute_name":"著者所属","attribute_value_mlt":[{"subitem_text_value":"宇宙航空研究開発機構宇宙科学研究本部"},{"subitem_text_value":"宇宙航空研究開発機構宇宙科学研究本部"},{"subitem_text_value":"宇宙航空研究開発機構"},{"subitem_text_value":"法政大学"},{"subitem_text_value":"大阪府立大学"},{"subitem_text_value":"大阪府立大学"},{"subitem_text_value":"大阪府立大学"},{"subitem_text_value":"情報通信研究機構"},{"subitem_text_value":"東京大学"},{"subitem_text_value":"東京大学"}]},"item_5_text_7":{"attribute_name":"著者所属（英）","attribute_value_mlt":[{"subitem_text_language":"en","subitem_text_value":"Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (ISAS)(JAXA)"},{"subitem_text_language":"en","subitem_text_value":"Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (ISAS)(JAXA)"},{"subitem_text_language":"en","subitem_text_value":"Japan Aerospace Exploration Agency (JAXA)"},{"subitem_text_language":"en","subitem_text_value":"Hosei Ujniversity"},{"subitem_text_language":"en","subitem_text_value":"Osaka Prefecture University"},{"subitem_text_language":"en","subitem_text_value":"Osaka Prefecture University"},{"subitem_text_language":"en","subitem_text_value":"Osaka Prefecture University"},{"subitem_text_language":"en","subitem_text_value":"National Institute of Information and Communications Technology (NICT)"},{"subitem_text_language":"en","subitem_text_value":"University of Tokyo"},{"subitem_text_language":"en","subitem_text_value":"University of Tokyo"}]},"item_access_right":{"attribute_name":"アクセス権","attribute_value_mlt":[{"subitem_access_right":"metadata only access","subitem_access_right_uri":"http://purl.org/coar/access_right/c_14cb"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"亀谷, 和久"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"土居, 明広"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"坪井, 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