GPS Block IIF, or GPS IIF is an interim class of GPS (satellite), which are used to keep the Navstar Global Positioning System operational until the GPS Block IIIA satellites become operational. They were built by Boeing, to be operated by the United States Air Force being launched by United Launch Alliance (ULA), using Evolved Expendable Launch Vehicles (EELV). They are the final component of the Block II GPS constellation to be launched. On 5 February 2016, the final satellite in the GPS Block IIF was successfully launched, completing the block.
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| - GPS Block IIF (en)
- GPS Block IIF (zh)
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| - GPS Block IIF卫星，或称GPS IIF卫星是GPS（卫星）的一个过渡类型，用于在GPS Block IIIA卫星开始运行前保持“导航星”全球定位系统运行。这些卫星由波音公司制造，美国空军运营，美国联合发射联盟（ULA）使用进化型消耗性运载火箭（EELV）发射。这是GPS星座Block II卫星中要发射的最后一部分。2016年2月5日，GPS Block IIF中的最后一颗卫星成功发射，完成了该区块。 该航天器的质量为1633kg（3600磅），设计寿命为12年。与先前的GPS卫星一样，Block IIF卫星运行在半同步中地球轨道，高度约20460km（12710英里），轨道周期为12小时。 该卫星代替了GPS Block IIA卫星，后者于1990-1997年间发射，设计寿命7.5年。Block IIA系列的最后一颗卫星于2016年1月25日退役。目前运行的星座现在包括Block IIR、IIRM和IIF变体。 由于进化型消耗性运载火箭（EELV）比德尔塔II（Delta II）运载能力更强，后者曾用于将Block II先前的GPS卫星送入轨道，前者可将卫星直接送入其运行轨道。因此，Block IIF卫星并不携带。Block IIF最初的合同于1996年签订，需要33颗卫星。后来减少到12颗卫星，并且计划推迟，技术问题导致第一次发射从2006年推迟到2010年。 (zh)
- GPS Block IIF, or GPS IIF is an interim class of GPS (satellite), which are used to keep the Navstar Global Positioning System operational until the GPS Block IIIA satellites become operational. They were built by Boeing, to be operated by the United States Air Force being launched by United Launch Alliance (ULA), using Evolved Expendable Launch Vehicles (EELV). They are the final component of the Block II GPS constellation to be launched. On 5 February 2016, the final satellite in the GPS Block IIF was successfully launched, completing the block. (en)
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| - Artist's impression of a Block IIF GPS satellite in orbit (en)
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| - GPS Block IIF, or GPS IIF is an interim class of GPS (satellite), which are used to keep the Navstar Global Positioning System operational until the GPS Block IIIA satellites become operational. They were built by Boeing, to be operated by the United States Air Force being launched by United Launch Alliance (ULA), using Evolved Expendable Launch Vehicles (EELV). They are the final component of the Block II GPS constellation to be launched. On 5 February 2016, the final satellite in the GPS Block IIF was successfully launched, completing the block. The spacecraft have a mass of 1,633 kg (3,600 lb) and a design life of 12 years. Like earlier GPS satellites, Block IIF spacecraft operate in semi-synchronous medium Earth orbits, with an altitude of approximately 20,460 km (12,710 mi), and an orbital period of twelve hours. The satellites replace the GPS Block IIA satellites that were launched between 1990 and 1997 and were designed to last 7.5 years. The final satellite of the Block IIA series was decommissioned on 25 January 2016. The operational constellation now includes Block IIR, IIRM, IIF and III variants. Because the Evolved Expendable Launch Vehicles are more powerful than the Delta II, which was used to orbit earlier Block II GPS satellites, they can place the satellites directly into their operational orbits. As a result, Block IIF satellites do not carry apogee kick motors. The original contract for Block IIF, signed in 1996, called for 33 spacecraft. This was later reduced to 12, and program delays and technical problems pushed the first launch from 2006 to 2010. (en)
- GPS Block IIF卫星，或称GPS IIF卫星是GPS（卫星）的一个过渡类型，用于在GPS Block IIIA卫星开始运行前保持“导航星”全球定位系统运行。这些卫星由波音公司制造，美国空军运营，美国联合发射联盟（ULA）使用进化型消耗性运载火箭（EELV）发射。这是GPS星座Block II卫星中要发射的最后一部分。2016年2月5日，GPS Block IIF中的最后一颗卫星成功发射，完成了该区块。 该航天器的质量为1633kg（3600磅），设计寿命为12年。与先前的GPS卫星一样，Block IIF卫星运行在半同步中地球轨道，高度约20460km（12710英里），轨道周期为12小时。 该卫星代替了GPS Block IIA卫星，后者于1990-1997年间发射，设计寿命7.5年。Block IIA系列的最后一颗卫星于2016年1月25日退役。目前运行的星座现在包括Block IIR、IIRM和IIF变体。 由于进化型消耗性运载火箭（EELV）比德尔塔II（Delta II）运载能力更强，后者曾用于将Block II先前的GPS卫星送入轨道，前者可将卫星直接送入其运行轨道。因此，Block IIF卫星并不携带。Block IIF最初的合同于1996年签订，需要33颗卫星。后来减少到12颗卫星，并且计划推迟，技术问题导致第一次发射从2006年推迟到2010年。 (zh)
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