一种基于小波变换的红外导引头信号检测方法  

A Method of Infrared Seeker Signal Detection Based on Wavelet Transform

作　　者：吴冰[1] 刘震[1] 张文琼 梁加红[1] 

机构地区：[1]国防科学技术大学机电工程与自动化学院,湖南长沙410073 [2]第二炮兵网管中心,北京100085

出　　处：《计算机仿真》2007年第10期74-77,122,共5页Computer Simulation

摘　　要：针对某型号红外导引头信号的检测问题,提出了一种基于离散平稳小波变换的微弱脉冲信号检测方法。根据有用脉冲信号与噪声信号在频谱特性上的差异,对导引头信号进行多尺度的离散平稳小波变换,利用分解后得到的低频近似信号逼近信号中的低频噪声来滤出低频噪声的干扰,同时采用阈值去噪的方法处理信号中的白噪声。将该方法应用于仿真信号和真实导引头信号检测,仿真实验结果表明:该方法在有效克服传统离散正交小波变换去噪时容易产生的Gibbs现象的前提下,极大地提高了导引头信号的信噪比,增强了导引头的探测能力。In order to detect signal of one kind of infrared seeker,a method of weak pulse signal detection based on discrete stationary wavelet transform was presented.The method utilized the differences in frequency distribution trait between pure pulse signal and noise signal.The low frequency color noise was removed by the low frequency approximation signal of a multi-resolution analysis based on discrete stationary wavelet transform.The white noise was filtered by soft-threshold de-nosing.By applying this method to simulate noisy pulse signal and real seeker signal,experimental result shows that this method can enhance SNR of seeker signal greatly and detection ability of infrared seeker on the condition that it can avoid the Gibbs phenomena which often occur in traditional discrete wavelet transform de-noising method.

关 键 词：微弱脉冲信号 平稳小波变换 离散小波变换 红外导引头 去噪 

分 类 号：TN957.51[电子电信—信号与信息处理]