随着空间技术的不断发展,美苏两国在空间的角逐也日趋激烈。为了争夺空间霸权,双方都在加紧空间战的各项准备,一方面研制进攻性的反卫星武器,一方面加强防御性的防天(Space Defense)能力。本文将简单介绍美国的防天现状。在苏联拦截卫星获得成功之时,这种反卫星武器就构成了对美国C~3系统工作网的威胁,美国卫星的生存能力就开始遇到了难题。为此, With the continuous development of space technology, the competition between the United States and the Soviet Union in space has also become increasingly fierce. In order to fight for space hegemony, both sides are stepping up their preparations for space warfare. On the one hand, they are developing offensive anti-satellite weapons while strengthening their defensive space defense capabilities. This article will briefly introduce the U.S. anti-terrorism status quo. When the Soviet Union successfully intercepted satellites, such anti-satellite weapons posed a threat to the US C-3 system working network. The viability of U.S. satellites began to encounter problems. to this end,