北京时间2012年4月30日4时50分,“长征三号乙”运载火箭在西昌卫星发射中心成功发射2颗“北斗”导航卫星,卫星顺利进入预定轨道。这2颗卫星是中国“北斗”导航卫星组网卫星的第12、第13颗,这是中国正在实施的自主发展、独立运行的全球卫星导航系统——“北斗”卫星导航系统首次采用“一箭双星”方式发射导航卫星,也是中国首次采 At 0450 hours on April 30, 2012, the “Long March III B” launch vehicle successfully launched 2 “Beidou” navigation satellites at Xichang Satellite Launch Center, and the satellite successfully entered the scheduled orbit. These two satellites are the 12th and 13th satellites of China’s Beidou navigation satellite network, which is the independently developed and independently operated global satellite navigation system under China’s Beidou navigation satellite system For the first time, the launch of navigation satellites using the “double bow” mode is also China’s first acquisition