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美国从六十年代初期开始了预警卫星的研究。第一代预警卫星米达斯(意即导弹探测和监视系统)主要采用红外技术。第二代预警卫星除红外技术外,开始采用其他的辅助探测手段。第二代预警卫星中编号为647的卫星(曾用461、266、949等编号)是1970年开始发射的。第一次发射未达到同步轨道,没有起到预定的作用,改为窥测我国导弹试验时的红外辐射,并对卫星上各种器件进行试验。1971年5月第二次发射的卫星,据说已开始第一个阶段的工作。这个卫星约长6公尺,重700公斤,(一说900公斤),以每秒几周的速度自旋,
The United States started the study of early warning satellites from the early 1960s. The first generation of early warning satellite Midas (that is, the missile detection and surveillance system) mainly uses infrared technology. The second generation of early warning satellites in addition to infrared technology, began to use other auxiliary detection methods. The No. 647 satellites of the second generation of early warning satellites (formerly numbered 461, 266, 949, etc.) were launched in 1970. The first launch did not reach the geostationary orbit, did not play a predetermined role, instead peep at the time of our missile test of infrared radiation, and various devices on the satellite test. The second satellite launched in May 1971 is said to have begun the first phase of its work. The satellite is about 6 meters long and weighs 700 kilos (say 900 kilos), spins at a rate of a few weeks per second,