小波降噪在引信时频信号处理系统中的应用  

Application of Wavelet De-noising in Time Frequency Signal Processing System of Fuze

作　　者：王学敏[1] 许玉国 孙永泽[1] 权建峰[1] 郑晨皓 

机构地区：[1]西安机电信息技术研究所 [2]解放军92132部队

出　　处：《探测与控制学报》2013年第6期18-22,27,共6页Journal of Detection & Control

摘　　要：针对传统基于短时傅里叶变换算法构建的引信信号处理系统在低信噪比回波条件下性能下降严重,无法完成回波信号处理任务的问题,提出将小波降噪算法引入原引信时频信号处理系统。在原时频信号处理系统之前加入小波降噪环节,选择合适的小波基对引信回波进行小波分解,使用小波阈值法对小波系数进行降噪处理,将系数重构后得到的降噪信号输入原时频信号处理系统。仿真表明,小波降噪环节的引入,能够有效去除回波信号中的杂波干扰,显著提高了引信时频信号处理系统在强杂波、强噪声背景下的性能表现。The traditional fuze signal processing system is usually based on short time Fourier transform.However its processing performance will be degraded dramatically when the signal noise ratio （SNR） is low,hence can not completing the process.To solve the problem,wavelet de-nosing technique was introduced to improve the performance of original system.Wavelet de-noising was completed before the original system.An adequate wavelet base was chosen to decompose the signal,and the coefficients of wavelet transform were manipulated by threshold de-noising method.After the reconstruction of wavelet,the result,which was the de-noised signal,was provided as input signal to the original time frequency signal processing system.The results of the simulations showed that the introduction of wavelet de-noising can remove the clutter and noise in fuse echo effectively,thus improves the performance of time frequency signal processing system in heavily cluttered or noisy background.

关 键 词：小波降噪 引信信号处理 时频信号处理 仿真 

分 类 号：TJ430[兵器科学与技术—火炮、自动武器与弹药工程] TN911[电子电信—通信与信息系统]