{"created":"2023-06-20T15:15:17.346850+00:00","id":45364,"links":{},"metadata":{"_buckets":{"deposit":"b96c28ec-7ed9-4815-8383-17869a90df63"},"_deposit":{"created_by":1,"id":"45364","owners":[1],"pid":{"revision_id":0,"type":"depid","value":"45364"},"status":"published"},"_oai":{"id":"oai:jaxa.repo.nii.ac.jp:00045364","sets":["1887:1893","1896:1898:1913:1917"]},"author_link":["474361","474359","474362","474360"],"item_3_alternative_title_2":{"attribute_name":"その他のタイトル（英）","attribute_value_mlt":[{"subitem_alternative_title":"The Observations and Analysis of Selective Availability in GPS"}]},"item_3_biblio_info_10":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"1991-04","bibliographicIssueDateType":"Issued"},"bibliographicPageStart":"20","bibliographicVolumeNumber":"1105","bibliographic_titles":[{"bibliographic_title":"航空宇宙技術研究所報告"},{"bibliographic_title":"Technical Report of National Aerospace Laboratory TR-1105","bibliographic_titleLang":"en"}]}]},"item_3_description_16":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"1990年3月25日から8月28日にかけて,選択利用性SA(Selective Availability)の試験が行われると報じられた。SAとは,意図的な誤差源を放送暦および衛星搭載時計に付加することによって,民間利用者の測位(速度,時刻)精度を劣化させるもので,全世界測位システムGPS(Global Positioning System)の運用段階(1993年半ば)において実施されると考えられている。現在宇宙部分は試験実証用として1980年代初頭に打ち上げられたブロックI型衛星と,運用型として1989年2月から打ち上げの始まったブロックII衛星から構成されており,ブロックII衛星のみがSA機能を有している。そこで,このSAの大きさ,時間的な挙動,動特性,などを推定する目的で,航技研所有のGPS受信機(NAVCORE-1)によって,このSA試験期間に疑似距離およびデルタ疑似距離(積分ドップラ)データを取得し,その高精度解析によって,SA誤差成分を分離した。その結果、以下のことが確認された。①SAはブロックII衛星にのみ実施されており,②疑似距離データにおけるSA誤差は周期が数分の短周期成分と数時間の長周期成分とからなり,その大きさは約30～50m(RMS)となっている.この大きさは水平面内の測位精度100m(95％)に相当し,公表されている米国防総省のポリシィに合致する。③同様にSA誤差はデルタ擬似距離にも入っているが,その大きさは小さく,航法精度への影響は無視できる。","subitem_description_type":"Abstract"}]},"item_3_description_17":{"attribute_name":"抄録（英）","attribute_value_mlt":[{"subitem_description":"Selective Availability(SA) of the Global Positioning System(GPS) was tested from March 25-Augsut 28, 1990. The objective of SA is to degrade the positioning accuracy of civilian GPS users by intentionally adding errors into the broadcast ephemerides and satellite clocks of the GPS navigation message, with SA expected to be implemented in the fully operational phase of GPS(about mid-1993). Presently only Block-II GPS satellites have this capability. In order to estimate the magnitude, time behavior, and dynamic/statistical characteristics of SA errors, both pseudorange and delta-pseudorange observations were taken during the SA test period using a Clear/Acquisition (C/A) code, single chan-nel GPS receiver (NAVCORE-1) of the National Aerospace Laboratory (NAL). SA errors were subsequently analyzed by computing residuals of the pseudorange/delta-pseudorange data. Analysis results show that:① SA was implemented on the Block-II satellites only. ② SA errors in the pseudorange data consisted of both short periodic components with the period of a few minutes and long periodic terms with the period of a few hours, with the magnitude ranging from 30～50m (RMS), which is consistent with the stated policy of U.S.Department of Defense (DoD), ③ The anomalous residuals in the delta-pseudorange data for the Block-II satellites were also observed, but the magnitude of which was well below the formal standard deviation (10cm) of the receiver, and this hardly has an effect on navigation accuracy in velocity.","subitem_description_type":"Other"}]},"item_3_description_32":{"attribute_name":"資料番号","attribute_value_mlt":[{"subitem_description":"資料番号: NALTR1105000","subitem_description_type":"Other"}]},"item_3_description_33":{"attribute_name":"レポート番号","attribute_value_mlt":[{"subitem_description":"レポート番号: NAL TR-1105","subitem_description_type":"Other"}]},"item_3_publisher_8":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"航空宇宙技術研究所"}]},"item_3_publisher_9":{"attribute_name":"出版者（英）","attribute_value_mlt":[{"subitem_publisher":"National Aerospace Laboratory(NAL)"}]},"item_3_source_id_21":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"0389-4010","subitem_source_identifier_type":"ISSN"}]},"item_3_text_6":{"attribute_name":"著者所属","attribute_value_mlt":[{"subitem_text_value":"航空宇宙技術研究所制御部"},{"subitem_text_value":"株式会社東芝"}]},"item_3_text_7":{"attribute_name":"著者所属（英）","attribute_value_mlt":[{"subitem_text_language":"en","subitem_text_value":"Control Systems Division, National Aerospace Laboratory(NAL)"},{"subitem_text_language":"en","subitem_text_value":"TOSHIBA Corporation"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"村田, 正秋"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"張替, 正敏"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"MURATA, Masaaki","creatorNameLang":"en"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"HARIGAE, Masatoshi","creatorNameLang":"en"}],"nameIdentifiers":[{}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2020-01-29"}],"displaytype":"detail","filename":"naltr01105.pdf","filesize":[{"value":"1.6 MB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"naltr01105.pdf","url":"https://jaxa.repo.nii.ac.jp/record/45364/files/naltr01105.pdf"},"version_id":"7136e62f-9a52-4bc3-a55e-15df0d365175"}]},"item_keyword":{"attribute_name":"キーワード","attribute_value_mlt":[{"subitem_subject":"GPS;  Selective Availability;  data analysis; navigation;  satellite positioning","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":"technical report","resourceuri":"http://purl.org/coar/resource_type/c_18gh"}]},"item_title":"GPSにおけるセレクティブ・アベイラビリティ(選択利用性)の観測と評価解析","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"GPSにおけるセレクティブ・アベイラビリティ(選択利用性)の観測と評価解析"}]},"item_type_id":"3","owner":"1","path":["1893","1917"],"pubdate":{"attribute_name":"公開日","attribute_value":"2015-03-26"},"publish_date":"2015-03-26","publish_status":"0","recid":"45364","relation_version_is_last":true,"title":["GPSにおけるセレクティブ・アベイラビリティ(選択利用性)の観測と評価解析"],"weko_creator_id":"1","weko_shared_id":-1},"updated":"2023-06-20T21:40:45.274886+00:00"}