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日本成功发射一颗导航卫星 欲建“日本版GPS”
2017-08-19 17:31:27 中国青年网
新华社东京8月19日电日本19日利用H2A火箭将导航卫星“引路”3号送入预定轨道,这朝着日本初步构建独立的卫星导航系统又迈进了一步。
19日14时29分(北京时间13时29分),H2A火箭从位于日本南部鹿儿岛县的种子岛宇宙中心发射升空。火箭发射约半小时后将“引路”3号卫星送入预定轨道。
“引路”1号于2010年发射升空,今年6月1日日本发射了“引路”2号。“引路”3号卫星原定于本月12日发射,但在发射前约1个小时因为燃料系统问题而临时取消了发射计划。日本计划今年再发射“引路”4号,初步构建一个拥有4颗卫星的卫星导航系统,并力争到2023年进一步扩充到7颗卫星。
日本“引路”系列卫星被称为准天顶卫星系统,该卫星系统包括多颗轨道周期相同的地球同步轨道卫星,这些卫星分布在多个轨道面上,无论何时,总有一颗卫星能够完整覆盖整个日本。这个系统也被称为日本版的GPS(全球卫星定位系统)。
现在日本在卫星定位方面完全依赖美国的GPS系统,日本政府希望建立能兼容美国GPS并能提高定位精度的自有卫星定位系统,未来实现不依赖美国GPS的独立全球卫星定位系统。
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