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卫星通信技术的发展为教育领域提供了一种新型的、有效的教育方式,然而,它毕竟是一种高科技复杂的通信手段,按照国际通信卫星组织规定的标准建立起来的卫星地面站,其机构庞大,系统复杂,造价昂贵,是一般建站部门所难以承受的,更是不易推广和普及的。当然,我们也可以根据自己建站的目的和需担负的任务,尽量降低地面站的性能指数,省去可省的部分,以达到既降低造价又不失它所应担负的任务,这就是一种小型非标准的卫星直播电视单收站。教育单位所用的就是这一类型。一、基本条件要接收好卫星直播电视的广播,首先必须具备以下三个方面的条件: 1.接收点必须置于被接收卫星电视的通信区内。以卫星为顶点,向地球方向作一圆锥体,当该圆锥体所覆盖的地球表面就是该卫星的覆盖区。当
The development of satellite communication technology, however, provides a new and effective way of education in the field of education. However, it is, after all, a high-tech and complex means of communication that has been established by the International Telecommunication Satellite Organization as a satellite ground station Large institutions, complex systems, expensive, is generally unbearable construction station sector, it is not easy to promote and universal. Of course, we can also reduce the performance index of the ground station as far as possible according to the purpose of our own station and the tasks to be undertaken, eliminating the need to save the part so as to achieve the goal of reducing the cost and shouldering the tasks it shoulders. This is a kind of Small non-standard satellite broadcast television stand. Education unit is used in this type. First, the basic conditions To receive a good broadcast of satellite live television, we must first have the following three conditions: 1. The receiving point must be placed within the receiving area of satellite television communications. With the satellite as the vertex, make a cone to the earth direction, when the surface covered by the cone is the coverage area of the satellite. when