说明：  本论文主要研究并设计实现了扩频通信接收系统的跟踪模块，接收系统主要由数字下变频、数字匹配滤波器、差分解调、自动频率跟踪处理等模块组成。
(This paper mostly introduces and implementes the receiving system, the receiver unit mainly consisted of the digital down converter, matched filter, differential demodulator, output processor and AFC module. )