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一、引言在民用航空地面与空中飞机间的各类话音通信方式中，甚高频（VHF）通信以其较好的话音质量和较经济的建设投资，目前已在世界范围内广泛使用。发达国家更是在一二十年前就已经完成了在陆地范围内的各航路的地空之间甚高频通信覆盖。许多大型的国际机场、空中交通管制中
I. INTRODUCTION VHF communication is widely used all over the world because of its good voice quality and more economical construction investment among various types of voice communication between civil aviation ground and airborne aircraft. Developed countries even completed the very high frequency communications coverage of the terrestrial routes on the land routes within a decade or two ago. Many large international airports, air traffic control