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卫星通信是现代航天技术和通信技术相结合的产物,是当今通信领域中十分重要的传输手段之一。卫星通信具有容量大、跨地域、抗自然干扰力强等优点,世界上使用卫星通信的国家和地区已达180多个。从1991年我国发行的《社会主义建设成就》邮票第4组邮票中的“西昌卫星发射中心”和四川省邮票公司同期发行的明信片上,我们可以看到火箭发射时尾部喷
Satellite communication is a product of a combination of modern space technology and communications technology and is one of the most important means of transmission in the field of communications. Satellite communications have the advantages of large capacity, geographical area and strong resistance to natural disasters. More than 180 countries and regions in the world are using satellite communications. From the “Xichang Satellite Launch Center” in the stamp No. 4 of the “Socialist Construction Achievements” stamp issued in China in 1991 and the postcards issued by the Sichuan Stamp Company over the same period, we can see that when the rocket is launched, the tail spray