摘要
在分析激光主动探测中回波信号的噪声特性和小波变换去噪原理的基础上,提出了一种基于最大信噪比准则的小波阈值去噪方法。首先用最大信噪比准则对小波变换系数进行阈值选取,然后采用软阈值方法对小波系数进行量化处理后再重构。仿真结果表明最大信噪比准则小波去噪方法改善信噪比效果十分显著,检测下限达到-16.2dB。证明了该方法在激光主动探测系统回波信号检测中的有效性。
Based on the analysis of noise characteristics and wavelet transform de-noising principle, a novel wavelet de-noising method based on maximal SNR principle is proposed. Maximal SNR principle is used to select the threshold and then soft-threshold method is used to quantify the wavelet coefficient. The simulation results show that maximal SNR principle method has an important effect on SNR improvement and it can detect signal in 16. 2 dB SNR. The results also show its validity in active laser detection.
出处
《光学与光电技术》
2007年第6期72-74,共3页
Optics & Optoelectronic Technology
关键词
激光主动探测
小波变换
最大信噪比准则
软阈值方法
active laser detection
wavelet transform
maximal SNR principle
soft-threshold method
