摘要
依据谐波分析法给出的评定信号质量指标的准则,提出了基于小波分析的光栅信号质量评估方法,并讨论了此方法的特征与优点.与谐波分析法相比较,小波分析在时域和频域同时具有良好的局部化性质,每次小波变换所取的都是原信号的最大可能近似值,信号的失真度小,通过变更尺度,可以对信号更细微的瞬态特征进行研究,并最大可能地除去噪声,较快地得到理想的质量评定效果(通常只需3至5次变换即可).在此基础上,给出了相应的小波分析评定光栅信号质量的实验方法.
On the basis of the signal quality standard given by the harmonic analysis method, a quality assessment of grating signal based on wavelet analysis is put forward and its characteristics are discussed. Compared with the harmonic analysis method, wavelet analysis characterize its local excellence both in time and frequency domain for every time of the wavelet transformation, with the wavelet analysis method the transient characteristic of the grating signal can be analyzed more subtly by changing the scale, and all possible noise can be filtered. The most possible approximation of the original signal and the least signal distortion are get with three to five times transformation, the ideal result is then quickly obtained. The corresponding experiment of grating signal quality assessment is given with wavelet analysis.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2005年第3期336-340,共5页
Chinese Journal of Lasers
基金
国家自然科学基金(50079032)资助项目.
关键词
衍射与光栅
谐波分析
质量评估
小波分析
小波脊线
Frequency domain analysis
Harmonic analysis
Time domain analysis
Wavelet transforms
