强混沌背景中频带内谐波信号提取

针对强混沌背景中频带内信号难以提取这一问题,提出了基于正交小波变换与小波软阈值滤波相结合的方法.以Lorenz混沌背景为例,对强混沌背景中的谐波信号进行提取.仿真试验结果表明,该方法比较适合于混沌背景中弱信号的检测与估计,与现有的相空间处理方法相比,简单直接,计算步骤少,可以实现对信号的实时处理.另外,该方法具有普适性,在混沌背景中信号提取领域有一定的发展前景.

Extraction of Harmonic Signal Embedded in Frequency Band from Strong Chaotic Background

A novel harmonic signal extraction algorithm is presented. The extraction of signal embedded in frequency band of chaotic background is always an important and difficult problem in chaotic signal processing field. Aiming at the problem, the authors used orthogonal wavelet transform and wavelet soft-threshold filter algorithm to extract harmonic signal from strong chaotic background (taking example for Lorenz signal). Simulation is given. The simulation results validate the conclusion:This method is suitable for extracting weak signal from chaotic background; comparing with existing methods, it is directer, simpler, the calculation consumption is fewer, and it can do real time processing on signal. The generalization of this method makes it have good prospect in the field of signal extraction from chaotic background.