双树复小波变换在川藏铁路拉林段某隧道超前地质预报中的应用
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杨丹, 李伟, 魏永梁, 宋斌
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Application of dual-tree complex wavelet transform in advanced geological prediction of the tunnel section in Lalin of Sichuan-Tibet Railway
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YANG Dan, LI Wei, WEI Yong-Liang, SONG Bin
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表2 第700道数据去噪效果评价
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Table 2 Evaluation of denoising effect of channel 700 data
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| 评价因子 | 阈值处理方法 | 阈值选择方法 | 通用 阈值 | 无偏似 然估计 | 启发式 阈值 | 极大极 小阈值 | | NRMSE | 软阈值 | 1.3842 | 0.2575 | 0.2575 | 1.0923 | | 硬阈值 | 1.3827 | 0.0492 | 0.0492 | 0.075 | | 半软阈值 | 1.3827 | 0.0513 | 0.0513 | 0.8001 | | 非负消减 | 1.3822 | 0.0289 | 0.0289 | 0.9888 | | SNR/dB | 软阈值 | 27.1385 | 41.7461 | 41.7461 | 29.1958 | | 硬阈值 | 27.1481 | 56.1196 | 56.1196 | 52.4614 | | 半软阈值 | 27.1481 | 55.7661 | 55.7661 | 31.9 | | 非负消减 | 27.1513 | 60.7458 | 60.7458 | 30.0601 | | P/% | 软阈值 | 47.3 | 82.07 | 79.78 | 57.08 | | 硬阈值 | 69.17 | 98.08 | 92.92 | 86 | | 半软阈值 | 56.7 | 96.02 | 91.45 | 74.29 | | 非负消减 | 73.28 | 98.88 | 93.5 | 87.33 |
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