基于数字信道化与能量检测的跳时刻捕获与跟踪  

HopTiming Estimation Algorithm Based on Digital Channelization and Channelized Energy Detection

作　　者：王昊[1] 罗进军[1] 王世练[1] 张尔扬[1] 

机构地区：[1]国防科学技术大学电子科学与工程学院,湖南长沙410073

出　　处：《通信对抗》2013年第2期12-16,共5页Communication Countermeasures

摘　　要：针对非合作接收宽带跳频信号的跳时刻估计问题,提出一种基于数字信道化和脉冲能量检测的跳频信号跳时刻捕获与跟踪方法。利用频率跳变时的脉冲能量分配信息,对数字化信号化输出信号分别进行超前-滞后能量检波,对两者的能量差进行二阶环路滤波,反馈调整跳时刻起始位置,实现对跳时刻的捕获与跳周期校正。理论推导和硬件实现表明:当信噪比及采样率一定时,采用适当的二阶环路滤波参数,该算法能有效估计出信号的跳变时刻,并能在出现时钟频率漂移时实现有效跟踪,系统估计误差可以小于10-3。This paper proposes a new hop timing estimation algorithm for frequency hopping signals based on digital channelization and energy detection which gives users a proper way to estimate parameter for non-co- operative broadband frequency hopping signal.The algorithm uses information of energy distribution and fre- quency diversity at the point of frequency hopping to allocate channel and filter signal with second-order loop. The algorithm estimates wide band and high FH signals to generate precise estimate of hopping time.The anal- ysis and hardware implementation results show that the hop timing estimation performs welt depending on proper parameters of second-order loop filter and SNR and sample rate condition.And the algorithm can track and hold the value when carier frequency drifting.The estimation error is less than 10^-3.

关 键 词：跳频信号 数字信道化 能量检测 二阶环路滤波 

分 类 号：TN911.23[电子电信—通信与信息系统]