摘要：把小波變換模極大值去噪法和小波變換閥值去噪法應(yīng)用于noissin模擬噪聲信號(hào)和某水電站巖石高邊坡安全監(jiān)測(cè)資料,根據(jù)信號(hào)和噪聲在小波變換各尺度上的不同傳播特性,剔除由噪聲產(chǎn)生的模極大值點(diǎn),保留信號(hào)所對(duì)應(yīng)的模極大值點(diǎn),利用剩余模極大值點(diǎn)重構(gòu)小波系數(shù),恢復(fù)原有監(jiān)測(cè)信號(hào)。并通過(guò)信噪比、去噪信號(hào)能量比、去噪信號(hào)與原信號(hào)標(biāo)準(zhǔn)差三個(gè)性能指標(biāo),比較二者的去噪性能。實(shí)例應(yīng)用表明,小波變換模極大值去噪法能夠更有效地去除噪音突變信號(hào),保留原始有用信號(hào)的突變點(diǎn),重構(gòu)信號(hào)能夠更光滑地重現(xiàn)原始信號(hào),比小波變換閥值去噪法性能更佳,具有更好的實(shí)際應(yīng)用價(jià)值。
Wavelet transform is attempted to be applied to safety monitoring.The method eliminates modular maximum caused by the noise,reserves the modular maximum caused by the useful signal using wavelet transform based on the different propagation characteristics of the signal and noise on the different scales,reconstructs wavelet coefficient using maximum residual modular and recoveries the primary monitoring signal.The denoising method of wavelet transform modular maximum and wavelet threshold are applied to two ...
