低信噪比高动态条件下的载波同步技术  

Carrier Synchronization Technique for Low SNR and High Dynamic Condition

作　　者：卢辉斌[1] 王伟伟[1] 谷青川[1] 

机构地区：[1]燕山大学信息科学与工程学院,河北秦皇岛066004

出　　处：《信息与控制》2010年第4期451-454,共4页Information and Control

摘　　要：针对极低信噪比高动态条件下载波同步问题,采用锁频环(FLL)和锁相环(PLL)相结合的方法来实现载波跟踪.对常用的叉积自动频率控制(CPAFC)环进行了改进,改进后的鉴频算法具有更快的捕获速度.对整体环路进行仿真,结果表明了该环路能有效地解决载波快速捕获与精确跟踪的问题.To actualize carrier synchronization under low signal-to-noise ratio（SNR） and high dynamic condition,a carrier tracking method combining FLL（frequency-locked loop） with PLL（phase-locked loop） is presented.An improvement on cross-product automatic frequency control（CPAFC） loop,which be commonly used,is preformed.The improved frequency discrimination algorithm has higher capture speed than CPAFC loop.The whole loops are simulated by MATLAB and the results show that the question of fast carrier acquisition and accurate tracking is solved effectually by these loops.

关 键 词：载波跟踪 高动态 叉积自动频率控制环 COSTAS环 

分 类 号：TN911.6[电子电信—通信与信息系统]