扩频信号的捕获与跟踪

Acquisition and Tracking of Signal in Spread Spectrum System

针对直接序列扩频信号,介绍了其发射和接收部分基本组成,给出了系统接收部分的具体设计框图。重点讨论了对扩频信号的捕获与跟踪的方法,其中包括扩频码的捕获与跟踪以及载波的捕获与跟踪。对各模块的性能进行了分析,提出了在高速信号处理板(以FPGA和DSP为基础)中对扩频信号的捕获与跟踪的实现方案。经工程验证,能够实现伪码同步和载波同步,解调出所需信号。

The paper introduces the basic composition of transmitter and receiver in direct-sequence spread spectrum system and gives the detailed design block diagram of the receiver.The paper focuses on the techniques of acquisition and tracking of signal in direct-sequence spectrum system,including acquisition and tracking of pseudo noise sequence and carrier.The performance of each block in the system is analyzed.The implementation scheme of acquisition and tracking of signal in direct-sequence system on high-speed digital signal board（based on FPGA and DSP） is presented.It is proved that the PN code and the carrier can be captured and tracked,and the required signal can be demodulated.