{"created":"2023-07-27T06:57:59.893247+00:00","id":55572,"links":{},"metadata":{"_buckets":{"deposit":"6ca2de4b-a7f5-4d0d-bd41-04fd27000c2b"},"_deposit":{"created_by":18,"id":"55572","owners":[18],"pid":{"revision_id":0,"type":"depid","value":"55572"},"status":"published"},"_oai":{"id":"oai:kanazawa-u.repo.nii.ac.jp:00055572","sets":["2812:2813:2826"]},"author_link":["88110","61"],"item_9_biblio_info_8":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2010-02-03","bibliographicIssueDateType":"Issued"},"bibliographicPageStart":"2p.","bibliographicVolumeNumber":"2005 – 2007","bibliographic_titles":[{"bibliographic_title":"平成19(2007)年度 科学研究費補助金 基盤研究(C) 研究成果報告書概要"},{"bibliographic_title":"2007 Fiscal Year Final Research Report Summary","bibliographic_titleLang":"en"}]}]},"item_9_creator_33":{"attribute_name":"著者別表示","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{}],"nameIdentifiers":[{},{}]}]},"item_9_description_21":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"科学衛星上で自律的にデータの選別・圧縮を行なうコンパクトかつ処理負荷が軽い超小型デジタル電波受信器の基礎技術について研究した。具体的な検討内容と成果は以下の通りである。\n1計算負荷の見積もりと機上のデータフローの実現評価手法の検討電磁界センサで得た広帯域波形データをCPU上で周波数解析するための最適な処理手順を検討し、現状の宇宙機用CPUで処理可能な最適手順を示した。特に低周波数帯での高周波数分解能スペクトルを、低計算負荷・低消費メモリで機上処理する方法を提案した。\n2各種データ圧縮アルゴリズムの既存計測データを用いた比較研究と定量評価「あけぼの」「かぐや」衛星による実観測電磁波データを用い、衛星上で取得・生成したスペクトル・波形双方について効率的なデータ圧縮法の検討を行なった。限られたテレメトリ容量下で、可逆圧縮と単純平均の併用より、科学的意義を損失なわない低歪みの非可逆圧縮法を提案した。\n3データ選別・自動抽出機能に関する技術的課題の検討デジタル電波受信器に実装した自動データ選別機能の性能を検証し、適切な選別基準の設定により限られた伝送帯域で有用データが効率的に取得できることを示した。また雷起源ホイスラを効率的に検出・分散値を求める方法を考案した。","subitem_description_type":"Abstract"},{"subitem_description":"We studied optimal algorithms for a software receiver onboard scientific satellite. For the purpose of designing optimal onboard software which obtains the maximum scientific output of the plasma physics, we examined several algorithms for data selection and data compression as well as signal processing for spectral analysis to be performed on a plasma wave instrument onboard the satellite. The main conclusions are summarized as follows:\n1. In order to obtain spectral data from wideband waveform capture using software installed on an onboard CPU, we proposed an optimal analyses method, especially for very low frequency range with a high frequency resolution.\n2. Data compression algorithm is also important to achieve higher data compression ratio as well as to keep fine data quality for scientific objectives. Both lossless and lossy algorithms are taken into account for the spectrum data. We demonstrated that higher data quality can be obtained by JPEG applying to higher time resolution data than by adaptive range-coder applying to nominal resolution data. As for the waveform data, we proposed a new sub-band ceding method.\n3. Onboard software processing was simulated using a small CPU, which is compatible to the one used for a scientific satellite. We measure execution times for the proposed data processing methods, and showed optimal parameters for the data processing.\n4. Automatic data detection and estimation of the dispersion characteristics of the lightning whistlers was developed. We demonstrated that the proposed method is applicable for the data selection for lightning whistlers, and the derived dispersion properties are useful for the reconstruction of a spatial profile of electron density in the plasma sphere.","subitem_description_type":"Abstract"}]},"item_9_description_22":{"attribute_name":"内容記述","attribute_value_mlt":[{"subitem_description":"研究課題/領域番号:17560370, 研究期間(年度):2006 – 2007","subitem_description_type":"Other"},{"subitem_description":"出典：「自律制御によるデータ選別・圧縮機能を備えた科学衛星搭載用電磁波計測器の開発」研究成果報告書　課題番号17560370\n（KAKEN：科学研究費助成事業データベース（国立情報学研究所））\n（https://kaken.nii.ac.jp/ja/report/KAKENHI-PROJECT-17560370/175603702007kenkyu_seika_hokoku_gaiyo/)を加工して作成","subitem_description_type":"Other"}]},"item_9_description_5":{"attribute_name":"提供者所属","attribute_value_mlt":[{"subitem_description":"金沢大学総合メディア基盤センター","subitem_description_type":"Other"}]},"item_9_identifier_registration":{"attribute_name":"ID登録","attribute_value_mlt":[{"subitem_identifier_reg_text":"10.24517/00061847","subitem_identifier_reg_type":"JaLC"}]},"item_9_relation_28":{"attribute_name":"関連URI","attribute_value_mlt":[{"subitem_relation_name":[{"subitem_relation_name_text":"https://kaken.nii.ac.jp/ja/search/?kw=50243051"}],"subitem_relation_type_id":{"subitem_relation_type_id_text":"https://kaken.nii.ac.jp/ja/search/?kw=50243051","subitem_relation_type_select":"URI"}},{"subitem_relation_name":[{"subitem_relation_name_text":"https://kaken.nii.ac.jp/ja/grant/KAKENHI-PROJECT-17560370/"}],"subitem_relation_type_id":{"subitem_relation_type_id_text":"https://kaken.nii.ac.jp/ja/grant/KAKENHI-PROJECT-17560370/","subitem_relation_type_select":"URI"}},{"subitem_relation_name":[{"subitem_relation_name_text":"https://kaken.nii.ac.jp/ja/report/KAKENHI-PROJECT-17560370/175603702007kenkyu_seika_hokoku_gaiyo/"}],"subitem_relation_type_id":{"subitem_relation_type_id_text":"https://kaken.nii.ac.jp/ja/report/KAKENHI-PROJECT-17560370/175603702007kenkyu_seika_hokoku_gaiyo/","subitem_relation_type_select":"URI"}}]},"item_9_version_type_25":{"attribute_name":"著者版フラグ","attribute_value_mlt":[{"subitem_version_resource":"http://purl.org/coar/version/c_ab4af688f83e57aa","subitem_version_type":"AM"}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2021-05-17"}],"displaytype":"detail","filename":"INF-PR-KASAHARA-Y-kaken 2010-2p.pdf","filesize":[{"value":"149.1 kB"}],"format":"application/pdf","licensetype":"license_11","mimetype":"application/pdf","url":{"label":"INF-PR-KASAHARA-Y-kaken 2010-2p.pdf","url":"https://kanazawa-u.repo.nii.ac.jp/record/55572/files/INF-PR-KASAHARA-Y-kaken 2010-2p.pdf"},"version_id":"aec6ada6-3747-4a0c-b3a6-e57fb5d55177"}]},"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":"research report","resourceuri":"http://purl.org/coar/resource_type/c_18ws"}]},"item_title":"自律制御によるデータ選別・圧縮機能を備えた科学衛星搭載用電磁波計測器の開発","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"自律制御によるデータ選別・圧縮機能を備えた科学衛星搭載用電磁波計測器の開発"},{"subitem_title":"Study on a high performance and multifunictional software receiver for plasma wave instrument","subitem_title_language":"en"}]},"item_type_id":"9","owner":"18","path":["2826"],"pubdate":{"attribute_name":"公開日","attribute_value":"2021-05-17"},"publish_date":"2021-05-17","publish_status":"0","recid":"55572","relation_version_is_last":true,"title":["自律制御によるデータ選別・圧縮機能を備えた科学衛星搭載用電磁波計測器の開発"],"weko_creator_id":"18","weko_shared_id":-1},"updated":"2023-07-27T14:22:26.840213+00:00"}