应用短时Fourier变换对尾流光学信号分析  

Analyzing Signal Applying Time-dependent Fourier Transform

作　　者：纪延俊[1] 何俊华[1] 郑黎[1] 陈良益[1] 

机构地区：[1]中科院西安光学机械精密研究所

出　　处：《光子学报》2004年第12期1533-1536,共4页Acta Photonica Sinica

基　　金：51448国防科技重点实验室资助项目

摘　　要：为弥补声探测尾流的不足,利用激光的独特优势,采用激光探测舰船尾流的方法.根据光信号的随机特性,确定了信号的分析方法短时Fourier变换.在信号的时频分布图中,表征了信号频率随时间的变化关系.通过对气泡幕光学信号时频图的分析,推测舰艇尾流的强弱.把这种探测手段应用于鱼雷自导,可提高鱼雷的作用距离、减小鱼雷半径,增强战斗力.Redeeming the shortage of sonar and making use of the advantage of laser, it was used in detecting the wake of ship. Time Dependent Fourier Transform was used for the reason of the light signal is random signal. The signal time frequency fig tokens the relation of frequency and time. Differentia of time frequency figs between differ air bubbles was used to speculate that the ship′s wake is strive or feebleness. Applying this detection method in the self directing of fish torpedo can increase its effect distance, reduce its radix and build up its battle effectiveness.

关 键 词：尾流 尾流自导 气泡幕 短时傅里叶变换 

分 类 号：O436[机械工程—光学工程]