BSAT-2a廣播衛星

BSAT-2a
所属组织 日本廣播衛星系統公司（日语：放送衛星システム）
主制造商 美国軌道科學公司
卫星平台STAR-1
任务类型广播卫星
发射时间2001年3月8日 22:51 (UTC) (2001-03-08T22:51Z)[1]
运载火箭亞利安5G運載火箭
发射地点圭亞那太空中心ELA-3號工位
任务时长10年 → 11.5年
COSPAR ID2001-011B
SATCAT no.26720
质量1,317公斤（2,903英磅）（起飛重量）
轨道参数
轨道类型地球同步軌道
静止经度东经110°E

BSAT-2a，為日本一枚已退役的广播卫星，由該國各公、私營電視台合營的「廣播衛星系統公司」持有[2]，於2001年發射升空。於服役期間，此衛星定位於東經110°E的婆羅洲上空[3]，透過Ku波段轉播日本各模擬及數碼衛星電視頻道，亦是該國第一枚為數碼電視廣播而設的同類衛星，與後來發射的BSAT-2c相輔相成。

由於運作壽命屆滿，BSAT-2a已於2013年退役，其空缺由2007年發射的BSAT-3系列廣播衛星取代。

概況

與前型BSAT-1a及1b不同，BSAT-2a由美國軌道科學公司製造，採用該公司設計的STAR-1衛星平台[4]。此衛星的尺寸為3.76米 × 2.49米 × 2.03米，兩側各有一組兩塊的太陽能板，展開後總長為16.1米[3]。在轉播設備方面，BSAT-2a與前型一樣，均設有8個轉發器（4個常用、4個備用），但行波管功率增至130W[3]。

除必要的轉播設備，此衛星亦備有姿態控制系統及供電裝置，當中前者包括與BSAT-1系列衛星相同的Star-30BP型變軌用火箭引擎，並備有200公斤推進劑[4]。

而在電力供應方面，上方提及的兩組太陽能板，最多可為此衛星產生2,600W的電力。

历史

1999年3月，廣播衛星系統公司下訂兩枚採用STAR-1平台的廣播衛星，包括此衛星及BSAT-2b[5]，以配合日本於2000年尾開始推行數碼衛星電視廣播[6]。

按照原來的計劃，此衛星將於2000年內升空。然而，由於不明緣故，BSAT-2a最後延誤至2001年3月8日，才連同歐洲通訊衛星33A號[7]，一併由亞利安5G V-140運載火箭搭載升空[8]，並於同年4月26日正式投入運作[1]。而在此衛星投用前的空窗期內，數碼衛星電視訊號暫由BSAT-1b負責傳送[5]。

2011年7月24日，隨著日本全面停播模擬電視（包括地面波及衛星電視）[9]，此衛星亦相應改為專門轉播數碼電視訊號。

由於衛星的推進劑已經接近耗盡，並已超期服役1年多，BSAT-2a於2013年1月正式退役，並被調至墓地軌道[10]。

参考文献

  1. ^ 1.0 1.1 BSAT 2A. NASA Space Science Data Coordinated Archive. 2016-04-27 [2016-09-07]. （原始内容存档于2021-11-06）. 
  2. ^ Broadcasting Satellite System Corporation (B-SAT). Global Security. [2016-09-09]. （原始内容存档于2021-08-25）. 
  3. ^ 3.0 3.1 3.2 Launch Kit V-140 (PDF). Arianespace. May 22, 2001 [2016-09-06]. （原始内容 (PDF)存档于2001-07-06）. 
  4. ^ 4.0 4.1 Richmond, Christopher W. The Growth of Orbital Sciences and the Market for Small GEO Satellites (PDF). Space Japan Review (English version) (AIAA JFSC). 2008, (55) [2016-09-06]. （原始内容 (PDF)存档于2016-09-06）. 
  5. ^ 5.0 5.1 沿革 [History]. 放送衛星系統株式會社. [2016-09-07]. （原始内容存档于2021-11-02）. 
  6. ^ 崔保国. BS数字卫星电视——日本电视竞争的新焦点[J]. 中国记者, 2001(6):78-79.
  7. ^ Wade, Mark. Star Bus. Astronautix.com. Encyclopaedia Astronautica. [2016-09-07]. （原始内容存档于2022-03-02）. 
  8. ^ Ray, Justin. Arianespace launches first Ariane 5 rocket of 2001. Space Flight Now. 2001-03-08 [2016-09-08]. （原始内容存档于2021-10-29）. 
  9. ^ 谢丰奕. 日本迎来全新的BS数字广播时代[J]. 卫星电视与宽带多媒体, 2012(7):18-19.
  10. ^ BSAT-2 Series (PDF). Orbital ATK. 2015 [2016-09-06]. （原始内容 (PDF)存档于2016-09-06）. 

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