混沌滤波器对水声信号非线性动力学特性的影响  

Influence of Chaotic IIR Filter on Nonlinear Dynamic Characteristic of Underwater Acoustic Signal

作　　者：李作川[1] 张宇[1] 许芳[1] 孙海信[1] 

机构地区：[1]厦门大学海洋与环境学院,水声通信与海洋信息技术教育部重点实验室,福建厦门361005

出　　处：《电子学报》2011年第10期2378-2381,共4页Acta Electronica Sinica

摘　　要：本文探讨了混沌滤波器在水声信号处理中的一种新的应用.混沌蔡氏电路产生的信号进行频带调制和高通IIR滤波后,由水声换能器发射并经过水池传播和接收.实验结果表明混沌滤波器实现了频带搬移,且接收到的水声信号具有与原始的混沌发射信号相似的宽频带特性.进一步,运用非线性动力学方法对原始混沌电路信号和接收水声信号进行时间序列分析比较.发现接收的水声信号具有比发射的原始混沌信号更为不规则的重建相空间和更高的分形维数.混沌滤波器运用于水声信道提高了接收信号的非线性复杂特性.A new application of chaotic filter in underwater acoustic signal processing is described.After frequency modulation and high-pass IIR filtering,the chaotic signal generated by the Chua＇s circuit was transmitted through a underwater sound channel.The received acoustic signal shows similar frequency band characteristic with chaotic circuit.Furthermore,nonlinear dynamic analysis is applied to compare the underwater acoustic signal and the original circuit signals.The results show that the acoustic signal has more irregular phase space and higher fractal dimension than chaotic circuit signals.Chaotic filter increases the complexity of the underwater signal.

关 键 词：混沌滤波器 水声信号处理 非线性 

分 类 号：TN911[电子电信—通信与信息系统]