扩谱技术的基本原理和几个主要问题

扩谱技术已广泛应用于很多领域,特别在军用抗干扰通讯、卫星多路通讯、无线电定位等方面发展很快。本文首先论述扩谱的基本原理,说明扩谱为什么有高的抗干扰性能;接着介绍了扩谱系统的分类,并以直接序列扩谱系统为重点,分析说明了它的工作原理,最后提出了扩谱系统设计所要解决的几个主要问题,重点讨论了扩谱码的性能和扩谱系统的截获和跟踪问题。

FUNDAMENTAL PRINCIPLE OF SPREAD SPECTRUM TECHNIQUE AND SOME PROBLEMS

The spread spectrum technique, which has been widely used in many fields, is getting a rapid development especially in military anti-interference communications, multiple satellite communications, radio locating, etc. This paper first deals with the fundamental principle of spread spectrum technique, and shows why it has high performance of anti-interference. Then the classification of spread spectrum systems is given . with the emphasis placed on the operational principle of direct sequence system. Finally, some problems in designing spread spectrum system are presented and the properties of the acquisition and tracking of the spread spectrum systems are discussed in detail.