多噪声背景下船舶轴频电场信号的提取  

Extraction of Shaft-rate Modulated Electric Fields of Ship-based under Kinds of Noise

作　　者：沈滨[1,2] 李俊[1] 陈信钦[1] 

机构地区：[1]海军工程大学,湖北武汉430033 [2]军械士官学校,湖北武汉430075

出　　处：《现代电子技术》2009年第19期44-46,共3页Modern Electronics Technique

摘　　要：船舶轴频电场信号是船舶的固有特征之一。浅海船舶轴频电场测量信号受到了低频周期噪声和海洋环境电场噪声等噪声的多重干扰,使得信号的提纯存在困难。这里具有针对性地对浅海船舶轴频电场信号进行分析,先通过时频分析方法对所得信号进行预处理,最后利用基于LMS算法的自适应滤波方法对测量信号进行噪声抵消。结果证明,这种方法确实使得干扰噪声得到大幅度抵消。The electric field is the intrinsic characteristic of a ship. Measurement of the electric field of a ship is greatly disturbed by noise in shallow sea. As far as time frequency method is concerned,the original signals are first analyzed within the frequency band, and then they are compared with the measured ambient signals. After the range of shaft -modulated signals are found, the signals of required frequency band are extracted for further IFFT transform. After that, the measured signals can be processed using adaptive filtering. At last, the better result is brought out.

关 键 词：自适应滤波 LMS算法 时频分析 轴频电场 

分 类 号：TN911[电子电信—通信与信息系统]