在导弹攻防技术不断进步的今天,空间卫士的任务多样而复杂。如今它已包括新型的预警和导弹跟踪系统,空间地球物理探测卫星系统,轨道激光武器和打击敌卫星的反卫星武器等。搜寻敌人美国从40年代后期就开始建立贯穿阿拉斯加和加拿大的雷达设施,构成了远距离预警系统(DEW防线)。这个系统经过改进变成今日的弹道导弹预警系统(BMEWS)。该系 In the continuous improvement of missile attack and defense technology today, the mission of space guards is diverse and complex. It now includes new types of early warning and missile tracking systems, space geophysical sounding satellite systems, orbiting laser weapons and antisatellite weapons to fight enemy satellites. Search for enemies The United States began building radar facilities throughout Alaska and Canada from the late 1940s to form the long-range early warning system (DEW line of defense). This system has been modified to become today's ballistic missile warning system (BMEWS). Department