基于拉依达准则的自适应小波阈值选取方法

Study on the Self-Adaptive Wavelet Threshold Selection Method Based on the Pauta Criterion

根据潜艇磁异常目标信号持续时间短、海浪磁场噪声依赖于时间和位置的特性,应用拉依达准则提出了一种有效区分海洋背景磁噪声和磁目标信号的自适应小波阈值选取方法。采用不同小波阈值选取法对含有海洋背景噪声的潜艇磁目标信号进行降噪处理,通过对比各阈值法降噪后的峰值信噪比(PSNR)和均方误差(MSE),验证了本文提出的自适应小波阈值选取方法的有效性。

According to the properties of short duration of submarine magnetic signal detection and dependence of wave magnetic field noises on time and position, a new self-adaptive wavelet threshold selection method based on the Pauta criterion is presented to effectively distinguish marine background noise and magnetic target signals.Noise reduction is conducted for the submarine magnetic target signals mixed with marine background noise with different wavelet threshold selection methods. The effectiveness of the new wavelet threshold selection method proposed in this paper is proved by comparing the PSNR and MSE of each wavelet threshold selection method.