一、引言扩展频谱技术(简称扩频技术)是在数字通信的基础上发展起来的。早在四十年代,信息论的形成和发展为它奠定了理论基础,后来由于电路技术的发展,逐渐使扩频通信进入实用阶段,至今已在许多领域中得到广泛的应用。扩频技术在军事上早期应用于测距和跟踪,以后发展到用于卫星、飞船等轨道的测量以及导航和射电天文等技术。扩频技术的另一个重要应用是扩频通信,这种通信 I. INTRODUCTION Spread spectrum technology (referred to as spread spectrum technology) is developed on the basis of digital communications. As early as the 1940s, the formation and development of information theory laid the theoretical foundation for it. Later, due to the development of circuit technology, the spread spectrum communication was gradually put into practical use. So far it has been widely used in many fields. Spread spectrum technology used in the military early ranging and tracking, later developed for satellite, spacecraft and other orbit measurement and navigation and radio astronomy and other technologies. Spread spectrum technology, another important application is spread spectrum communications, such communications