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美国空军准备招标,再造20颗“布洛克Ⅱ”补充型导航星,预定1994年起将陆续交付发射,以保证九十年代的美国实用导航星网。这些补充卫星将从1988年开始制造。空军以前的全球定位系统导航星是由国际洛克韦尔公司承造的。
The US Air Force prepares for bids and recreates 20 “Brock II” supplemental navigation satellites. It is scheduled to launch deliveries in succession from 1994 to ensure the United States’ practical navigation satellite network in the 1990s. These supplemental satellites will be manufactured starting in 1988. The Air Force’s previous Global Positioning System navigation star was contracted by International Rockwell.