摘要
为了解决正确检测和识别直扩信号的问题,提出一种基于循环谱理论和矩阵变换法的盲估计算法。该算法在先验知识缺乏的情况下,充分利用直扩信号的二阶循环平稳特性,排除噪声干扰,对载频和码速率进行估计。并在此基础上运用矩阵变换法,将基带信号进行分段累加运算处理,实现伪随机序列的盲估计。Matlab仿真结果表明此算法可以在低信噪比情况下正确检测和识别出扩频信号的载频、伪码速率、伪码周期和伪码码形等主要参数。
In order to solve the problem of direct sequence spread spectrum signal＇s check and recognition, a blind estimate algorithm is proposed, it based on cyclic spectrum theory and matrix transform. This algorithm can estimate carrier frequency, and rate of the PN code, eliminate the effect of noise using the second order cyclic stationary characteristic without a prior knowledge. Then using matrix transform, the base band signals are divided into vectors to deal with and cumulate to realize the blind estimate of PN code. The Matlab simulation results show that this algorithm can check and recognize the carrier frequency, PN code rate, period and sequence well on lower SNR.
出处
《弹箭与制导学报》
CSCD
北大核心
2007年第5期258-261,264,共5页
Journal of Projectiles,Rockets,Missiles and Guidance
基金
国家无线电监测中心立项项目(05-MC-KY-30)
关键词
矩阵变换法
循环谱
电子引信系统
直扩信号
估计函数
PN序列
matrix transform
cyclic spectrum
electronic fuze system
direct sequence spread spectrum signal
estimate function
PN code period
