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2015年1月20日,美国“宇宙神”-5火箭将“移动用户目标系统”的第3颗通信卫星送入太空。美国“移动用户目标系统”卫星星座将于2015年底建成,最终由4颗工作星、1颗在轨备份星和4个地面站组成。它用于替代美国海军现役的“特高频后继星”星座,主要提供类似智能手机服务的窄带移动通信服务,可为移动作战人员提供安全通信(包括为移动中的军方用户提供实时语音、视频和数据服务),首次实现为手持用户终端提供超高频卫星通信,极大地增强了
On January 20, 2015, the United States “cosmic god ” - 5 rocket into the spacecraft “mobile user target system” third communication satellite. The United States “Mobile Subscriber System” satellite constellation will be completed by the end of 2015 and eventually will be composed of four working stars, one on-board backup star and four ground stations. It is used to replace the U.S. Navy’s existing UHF Successor Star constellation, which provides narrowband mobile communications services like smartphones to provide secure communications to mobile warfighters (including real-time Voice, video and data services), for the first time to provide UHF satellite communications for handheld user terminals, greatly enhancing