近年来，低轨卫星（LEO, Low Earth Orbit）成为全球科技与通信领域的“香饽饽”。所谓低轨卫星，是指运行在距地球表面约300至2000公里轨道上的卫星。相比传统的地球同步轨道（GEO）卫星，低轨卫星具有传输延迟低、信号衰减小、部署灵活等显著优势。首先，低轨卫星的轨道高度低，使得信号往返时间大幅缩短，特别适合对实时性要求高的应用场景，如视频通话、在线游戏和自动驾驶通信。其次，由于距离地面更近，其信号强度更高，终端设备可以更小型化、功耗更低，有利于普及到普通消费者手中。此外，通过构建由成百上千颗卫星组成的“星座”系统（如SpaceX的Starlink、OneWeb等），可实现全球无缝覆盖，尤其能为偏远地区、海洋、空中等传统通信难以覆盖的区域提供互联网接入服务。随着发射成本因可回收火箭技术而大幅下降，以及芯片、材料等技术的进步，低轨卫星的商业可行性显著提升。各国政府与企业纷纷布局，不仅看重其通信价值，也关注其在导航增强、遥感监测、应急通信乃至国防安全方面的战略意义。因此，低轨卫星不仅是技术热点，更是未来数字基础设施的关键组成部分。
In recent years, Low Earth Orbit (LEO) satellites have become a highly sought-after asset in the global tech and communications sectors. LEO satellites operate at altitudes between approximately 300 and 2,000 kilometers above Earth—much closer than traditional geostationary (GEO) satellites. This proximity offers significant advantages: lower signal latency, reduced signal attenuation, and greater deployment flexibility.Firstly, the short distance dramatically reduces round-trip communication delay, making LEO ideal for real-time applications such as video calls, online gaming, and autonomous vehicle connectivity. Secondly, stronger signal strength enables smaller, lower-power user terminals, facilitating mass-market adoption. Moreover, mega-constellations comprising thousands of LEO satellites—like SpaceX’s Starlink and OneWeb—can deliver seamless global internet coverage, especially benefiting remote regions, oceans, and airspace where conventional infrastructure is unavailable.Thanks to reusable rocket technology, launch costs have plummeted, while advances in microelectronics and materials have further enhanced commercial viability. Governments and corporations worldwide are now racing to deploy LEO systems, recognizing not only their communication potential but also their strategic value in navigation augmentation, Earth observation, emergency response, and national security. As such, LEO satellites represent both a technological frontier and a cornerstone of future digital infrastructure.
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