从无线电被发明以来,它在国民經济和国防方面的应用日益广泛,包括通信、广播、定向、定位、导航、遙控、遙測等方面。在所有这些应用方面都要遇到无綫电波传播問题。无线电波传播有一定的規律性,只有掌握了这些規律性,运用它們,才能更好地达到上述各个应用方面的目的。我国現在正处在社会主义建設飞跃发展的时代,为了适应全国工农业的大发展,交通运輸业的大发展,以及全国人民对物貭和文化生活日益增 Since the invention of the radio, it has been widely used in national economy and national defense, including communications, broadcasting, orientation, positioning, navigation, remote control and telemetry. The problem of radio wave propagation is encountered in all of these applications. Radio waves have a certain regularity, and only by grasping these regularities and using them can we better achieve the above purposes of various applications. Our country is now in an era of rapid development of socialism. In order to meet the great development of agriculture and industry in our country, the great development of the transportation industry and the ever increasing increase in material and cultural life by the people throughout the country