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近年来,随着卫星通讯技术的迅速发展,电视传播的时效越来越快,范围越来越广。借助于定点在赤道上方距地面3万多公里的同步卫星,电波载着信息以每秒30万公里的速度传播。美国总统竞选演说,伊拉克战火时起时伏,实况转播令人大开眼界,一饱眼福。目前全世界已有很多卫星电视接收机在工作,我国起步较晚,现也有3万多部在工作。由于卫星电视
In recent years, with the rapid development of satellite communication technology, the aging of television has become faster and faster and its scope is wider and wider. With the aid of fixed-satellite geostationary satellites over 30,000 kilometers above the equator above the equator, radio waves carried information at a rate of 300,000 kilometers per second. U.S. presidential campaign speeches staged an upsurge of war in Iraq. The live broadcast has an eye-opener and a full-fledged vision. At present, many satellite television receivers are working in the world, and our country started late. There are now more than 30,000 of them at work. Thanks to satellite TV