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31 lugl 2020 anni - 北斗导航

Descrizione:

1994年，中国正式开始北斗卫星导航试验系统（北斗一号系统）的研制，并在2000年10月31日和12月21日相继发射了两颗静止轨道卫星，区域性的导航功能得以实现。
2003年又发射了一颗备份卫星，完成了北斗卫星导航试验系统的组建。
北斗三号系统于2020年7月31日完整开通

Aggiunto al nastro di tempo:

3.3.2战后演化

2 mesi fa

2

0

5499

Data:

31 lugl 2020 anni

Adesso

~ 5 years and 3 months ago

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