【摘要】：針對(duì)小波閾值去噪傳統(tǒng)方法所使用的閾值函數(shù)存在不連續(xù)或估計(jì)的小波系數(shù)存在偏差導(dǎo)致去噪效果不理想的問(wèn)題,提出了雙重指數(shù)型閾值函數(shù)。該閾值函數(shù)呈雙重指數(shù)形式,不是分段函數(shù),含有一個(gè)調(diào)控參數(shù)控制估計(jì)的小波系數(shù)向分解的小波系數(shù)或0逼近的速度,以閾值和分解的小波系數(shù)的比值是否大于1判定估計(jì)的小波系數(shù)的逼近方向。仿真結(jié)果表明在對(duì)多普勒回波的去噪過(guò)程中,使用雙重指數(shù)型閾值函數(shù)的去噪結(jié)果優(yōu)于使用傳統(tǒng)閾值函數(shù)的去噪結(jié)果。
[Abstract]:In order to solve the problem that the threshold function used in traditional wavelet threshold denoising method is discontinuous or the estimated wavelet coefficients are deviated and the denoising effect is not ideal, a double exponential threshold function is proposed. The threshold function is a double exponential function, not a piecewise function, and contains a regulating parameter to control the speed of the wavelet coefficients being decomposed to the decomposed wavelet coefficients or zero approximation. The approximation direction of the estimated wavelet coefficients is determined by whether the ratio of the threshold and the decomposed wavelet coefficients is greater than 1. The simulation results show that the double exponential threshold function is better than the traditional threshold function in the denoising process of Doppler echo.
【作者單位】： 西安機(jī)電信息技術(shù)研究所;機(jī)電動(dòng)態(tài)控制重點(diǎn)實(shí)驗(yàn)室;
【分類(lèi)號(hào)】：TN911.4

【共引文獻(xiàn)】

相關(guān)期刊論文 前10條

1 周健;龍興武;;小波分析在激光多普勒信號(hào)處理中的應(yīng)用[J];強(qiáng)激光與粒子束;2010年12期

2 董林W，

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