{"created":"2023-06-20T14:44:04.538824+00:00","id":11469,"links":{},"metadata":{"_buckets":{"deposit":"4e68f697-f67f-410d-aa91-a560904d172f"},"_deposit":{"created_by":1,"id":"11469","owners":[1],"pid":{"revision_id":0,"type":"depid","value":"11469"},"status":"published"},"_oai":{"id":"oai:jaxa.repo.nii.ac.jp:00011469","sets":["1543:1580:1595","1887:1891"]},"author_link":["100898","100904","100910","100901","100903","100894","100908","100911","100896","100897","100902","100905","100907","100900","100909","100899","100906","100895"],"item_5_alternative_title_2":{"attribute_name":"その他のタイトル（英）","attribute_value_mlt":[{"subitem_alternative_title":"Broadband data downlink for VSOP-2"}]},"item_5_biblio_info_10":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2004-08","bibliographicIssueDateType":"Issued"},"bibliographicPageEnd":"144","bibliographicPageStart":"141","bibliographic_titles":[{"bibliographic_title":"第4回宇宙科学シンポジウム"},{"bibliographic_title":"Proceedings of the 4th Space Science Symposium","bibliographic_titleLang":"en"}]}]},"item_5_description_16":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"「はるか」に続く次期スペースVLBI(VSOP-2)衛星計画における広帯域データ伝送システムについて、技術検討の詳細を報告する。VSOP-2では40GHz帯の送受信周波数を用いて1Gbps以上でのデータ伝送を目指しており、「はるか」でのデータ伝送に対して1)広帯域、降雨減衰などの条件下でのリンクマージンの確保、2)帯域外放射を抑制し、大容量データ伝送を可能にする変調方式の実現が新たに要求される。これまでの検討から、QPSK変調波をOFDM(直交周波数分割多重)方式により合成するマルチキャリア変調方式がVSOP-2衛星での広帯域データ伝送を実現できる最も有力な手法と考えている。本方式について、電力増幅器の非線形歪みの特性がビットエラーレート(BER)に与える影響を計算機シミュレーションにより確認した結果、VSOP-2観測で要求される条件を満たすことが分かった。また現時点での各機器の使用に基づいて回線計算を行った結果、送受信の両方についてリンクマージンを確保できることが分かった。今年度データ伝送系のエンジニアリングモデル開発を行い、本方式の実現可能性の検証を行う。","subitem_description_type":"Abstract"}]},"item_5_description_32":{"attribute_name":"資料番号","attribute_value_mlt":[{"subitem_description":"資料番号: AA0047899033","subitem_description_type":"Other"}]},"item_5_publisher_8":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"宇宙航空研究開発機構宇宙科学研究本部"}]},"item_5_publisher_9":{"attribute_name":"出版者（英）","attribute_value_mlt":[{"subitem_publisher":"Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA/ISAS)"}]},"item_5_text_6":{"attribute_name":"著者所属","attribute_value_mlt":[{"subitem_text_value":"国立天文台"},{"subitem_text_value":"宇宙航空研究開発機構"},{"subitem_text_value":"宇宙航空研究開発機構"},{"subitem_text_value":"宇宙航空研究開発機構"},{"subitem_text_value":"宇宙航空研究開発機構"},{"subitem_text_value":"宇宙航空研究開発機構"},{"subitem_text_value":"宇宙航空研究開発機構"},{"subitem_text_value":"国立天文台"},{"subitem_text_value":"国立天文台"}]},"item_5_text_7":{"attribute_name":"著者所属（英）","attribute_value_mlt":[{"subitem_text_language":"en","subitem_text_value":"National Astronomical Observatory"},{"subitem_text_language":"en","subitem_text_value":"Japan Aerospace Exploration 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interferometry","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"VSOP-2","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"broadband","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"data downlink","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"bit error rate","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"frequency division multiplexing","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"rain attenuation","subitem_subject_language":"en","subitem_subject_scheme":"Other"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"jpn"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"conference 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