卫星通信(wèixīng tōngxìn): Satellite communication is the use of artificial satellites to provide communication links between various points on Earth.
空间光通信(kōngjiān guāng tōngxìn): Free-space optical communication uses light beams to transmit data through space, enabling high-speed wireless communication.
卫星导航(wèixīng dǎoháng): Satellite navigation systems like GPS (Global Positioning System) use satellites to provide positioning and timing information for navigation purposes.