数字Costas环的设计与实现  

Design and Implementation of Digital Costas-loop

作　　者：陈荣[1] 管吉兴[1] 张喜明[1] 

机构地区：[1]中国电子科技集团公司第五十四研究所,河北石家庄050081

出　　处：《无线电工程》2010年第3期24-26,64,共4页Radio Engineering

摘　　要：针对扩频系统的载波同步,研究了数字Costas环的设计和实现方法。介绍了数字Costas环的结构、实现载波同步的基本方法。以二阶环为例,分析了数字锁相环的环路滤波器的参数设计方法,为数字Costas环的设计提供了参考。提出了在高速信号处理板(以FPGA和DSP为基础)中数字Costas环的实现方案,经工程验证,能够实现载波同步,解调出所需信号。The paper introduces the design and implementation of digital Costas-loop for realization of carrier-synchronization in spread spectrum system, and presents its structure as well as the basic method of realizing carrier synchronization. The paper, with second-order loop taken as example, analyzes the parameter design of loop filter of Digital Phase Locked Loop, which provides a reference for the design of digital Costas-loop. The implementation scheme of digital Costas-loop in high-speed digital signal board （based on FPGA and DSP） is presented, and it is proven by engineering validation that the Costas-loop can realize carrier synchronization and demodulate the needed signal.

关 键 词：数字COSTAS环 载波同步 环路滤波器 数字锁相环 

分 类 号：TN914.42[电子电信—通信与信息系统]