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GPS Block III (previously Block IIIA) consists of the first ten GPS III satellites, which will be used to keep the Navstar Global Positioning System operational. Lockheed Martin designed, developed and manufactured the GPS III Non-Flight Satellite Testbed (GNST) and all ten Block III satellites. The first satellite in the series was launched in December 2018. The tenth and final GPS Block III launch is projected in 2023. (en) GPSブロックIII（過去にはブロックIIIAとも呼ばれていた）は、10基のGPSIII衛星で構成され、ナブスターGPSの運用継続を目的とするシステムである。ブロックIIIの10基すべての衛星および試験用テストベッドの設計、開発および製造は、ロッキード・マーティン社により行われた。最初の衛星は、2018年12月に打ち上げられた。最後の10回目のGPSブロックIIIの打ち上げは、2023年に予定されている。 (ja) GPS 블록 IIIA는 미국의 최신형 GPS 위성이다. (ko) GPS III（旧称“GPS IIIA”）是由洛克希德·马丁公司负责设计、制造的首批第三代全球定位系统（GPS）导航卫星，共由10颗卫星组成。第一颗GPS III卫星原定于2014年发射，但实际的发射时间因故推迟至了2018年12月23日，最后一颗GPS III卫星则计划于2023年的第二季度发射升空。 GPS III是GPS现代化建设的一部分。相较于先前的GPS卫星系列，GPS III上增设了L1C码作为第四民用测距码，其导航信号的设计精度提高了三倍，设计抗干扰能力提高了八倍，可靠性和完备性也均有所提升。GPS III卫星的设计使用寿命为15年，较先前最新的GPS卫星提升了约25%。此外，GPS III使用的L1C导航信号还能与伽利略定位系統的E1信号及北斗卫星导航系统的B1C导航信号相兼容，这使得GPS III成为了首批能与其他全球卫星导航系统的信号相兼容的GPS导航卫星。 (zh) |
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http://www.gpsworld.com/gnss-system/gps-modernization/the-modernized-l2-civil-signal-730%7Ctitle=The http://www.space.commerce.gov/gps/modernization.shtml%7Ctitle=GPS https://web.archive.org/web/20091031043858/http:/www.space.commerce.gov/gps/modernization.shtml%7Carchive-date=2009-10-31 https://web.archive.org/web/20110614015919/http:/www.navcen.uscg.gov/pdf/cgsicMeetings/46/15%20CGSIC%20GPS%20Prog%2046.pdf%7Carchive-date=2011-06-14 https://web.archive.org/web/20110614020046/http:/www.navcen.uscg.gov/pdf/cgsicMeetings/38/clarke.ppt%7Carchive-date=2011-06-14 https://web.archive.org/web/20110709170255/http:/www.gpsworld.com/gnss-system/gps-modernization/the-modernized-l2-civil-signal-730%7Carchive-date=2011-07-09 https://web.archive.org/web/20110709170325/http:/www.gpsworld.com/defense/precision-guidance/getting-m-955%7Carchive-date=2011-07-09 https://www.mitre.org/sites/default/files/pdf/betz_overview.pdf%7Ctitle=Overview http://www.navcen.uscg.gov/pdf/cgsicMeetings/38/clarke.ppt%7Cformat=PPT%7Cfirst=Lt. http://www.navcen.uscg.gov/pdf/cgsicMeetings/46/15%20CGSIC%20GPS%20Prog%2046.pdf%7Cfirst=Col. http://www.gpsworld.com/defense/precision-guidance/getting-m-955%7Ctitle=Getting http://www.globalsecurity.org/space/systems/gps_3-ocx.htm%7Ctitle=GPS http://www.globalsecurity.org/space/systems/gps_3.htm%7Ctitle=GPS https://www.engadget.com/2006/01/25/government-turns-up-volume-on-gps/%7Ctitle=Government |
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GPS Block III (previously Block IIIA) consists of the first ten GPS III satellites, which will be used to keep the Navstar Global Positioning System operational. Lockheed Martin designed, developed and manufactured the GPS III Non-Flight Satellite Testbed (GNST) and all ten Block III satellites. The first satellite in the series was launched in December 2018. The tenth and final GPS Block III launch is projected in 2023. (en) GPSブロックIII（過去にはブロックIIIAとも呼ばれていた）は、10基のGPSIII衛星で構成され、ナブスターGPSの運用継続を目的とするシステムである。ブロックIIIの10基すべての衛星および試験用テストベッドの設計、開発および製造は、ロッキード・マーティン社により行われた。最初の衛星は、2018年12月に打ち上げられた。最後の10回目のGPSブロックIIIの打ち上げは、2023年に予定されている。 (ja) GPS 블록 IIIA는 미국의 최신형 GPS 위성이다. (ko) GPS III（旧称“GPS IIIA”）是由洛克希德·马丁公司负责设计、制造的首批第三代全球定位系统（GPS）导航卫星，共由10颗卫星组成。第一颗GPS III卫星原定于2014年发射，但实际的发射时间因故推迟至了2018年12月23日，最后一颗GPS III卫星则计划于2023年的第二季度发射升空。 GPS III是GPS现代化建设的一部分。相较于先前的GPS卫星系列，GPS III上增设了L1C码作为第四民用测距码，其导航信号的设计精度提高了三倍，设计抗干扰能力提高了八倍，可靠性和完备性也均有所提升。GPS III卫星的设计使用寿命为15年，较先前最新的GPS卫星提升了约25%。此外，GPS III使用的L1C导航信号还能与伽利略定位系統的E1信号及北斗卫星导航系统的B1C导航信号相兼容，这使得GPS III成为了首批能与其他全球卫星导航系统的信号相兼容的GPS导航卫星。 (zh) |
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GPS Block III (en) グローバル・ポジショニング・システム ブロックIII (ja) GPS 블록 IIIA (ko) GPS III (zh) |
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