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自1957年10月4日苏联发射了第一颗人造地球卫星以来,美国亦积极发展了人造卫星技术。继而其他国家也发射了人造卫星。我国于1970年4月22日成功地发射了第一颗人造地球卫星,1971年又发射了第二颗人造卫星。今天,已有1000个以上的人造天体云游在太空之中。各种人造卫星具备着各不相同的用途,诸如科学研究、宇宙探测、气象观测、卫星通信及军事应用等。本文就卫星通信方面作一概述。
Since the Soviet Union launched its first man-made earth satellite on October 4, 1957, the United States has also actively developed satellite technology. Then other countries also launched satellites. My country successfully launched its first artificial Earth satellite on April 22, 1970 and the second artificial satellite in 1971. Today, more than 1,000 man-made objects are roaming in space. Various satellites have different uses, such as scientific research, space exploration, meteorological observation, satellite communications and military applications. This article gives an overview of satellite communications.