80年代末期以来,如果稍加留意就会发现,楼顶及地面的天线“锅”越来越多,电视节目的套数越来越多,电视屏上的图、声质量越来越好,如此欣喜的局面得益于卫星电视技术的发展。据不完全统计,仅亚太地区的赤道上空,竟分布、集聚着用于通讯和电视广播的同步卫星70多颗,播出节目500多套,可谓群星灿烂。一、同步卫星简介通过运载火箭将卫星送入距地球35786公里(平均值)的太空宇宙轨道。轨道呈圆周形,其平面与地球赤道平面平行。卫星沿宇宙轨道绕地球一周的时间正好与地球自转 Since the late 1980s, if you pay more attention, you will find that there are more and more antennas on the rooftop and on the ground, the number of TV programs is more and more, and the sound quality on the TV screen is getting better and better. The happy situation thanks to the development of satellite television technology. According to incomplete statistics, over the equator of the Asia-Pacific region alone, more than 70 simultaneous satellites for communications and television broadcasting and more than 500 sets of broadcast programs have been distributed and gathered together. I. Synchronous Satellite Introduction The satellite will be launched into the space orbit of 35,786 km (mean) by the launch vehicle. The orbit is circular and its plane is parallel to the Earth’s equatorial plane. A satellite orbiting the Earth just about a week round the Earth rotates with the Earth