Suppression of Regular Acoustic Impulse Noise on Sub-Bottom Profiling: A MAD-Based Switching Median Filtering

Xiao Yibao; Li Xishuang; Liu Lejun; Ma Long; Liu Chengguang; Guo Ruoshun

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Xiao Yibao，Li Xishuang，Liu Lejun, et al. Suppression of Regular Acoustic Impulse Noise on Sub-Bottom Profiling: A MAD-Based Switching Median Filtering[J]. Haiyang Xuebao，2025, 47(x)：1–9

Citation:

Xiao Yibao，Li Xishuang，Liu Lejun, et al. Suppression of Regular Acoustic Impulse Noise on Sub-Bottom Profiling: A MAD-Based Switching Median Filtering[J]. Haiyang Xuebao，2025, 47(x)：1–9

Citation:

Xiao Yibao，Li Xishuang，Liu Lejun, et al. Suppression of Regular Acoustic Impulse Noise on Sub-Bottom Profiling: A MAD-Based Switching Median Filtering[J]. Haiyang Xuebao，2025, 47(x)：1–9

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Suppression of Regular Acoustic Impulse Noise on Sub-Bottom Profiling: A MAD-Based Switching Median Filtering

1.
First Institute of Oceanography, Ministry of Natural Resources, Qingdao, Shandong 266000, China
2.
Shandong University, Qingdao, Shandong 266000, China
3.
Qingdao Ocean Engineering Survey and Design Institute Co., Ltd, Qingdao, Shandong 266000, China

Received Date: 2024-12-06
Rev Recd Date: 2025-03-05

Available Online: 2025-04-24

Abstract

Abstract

In the process of marine integrated geophysical surveys, in the absence of an acoustic synchronizer, acoustic pulses emitted by multibeam and other acoustic equipment become noise for sub-bottom profiling, severely affecting the signal-to-noise ratio and resolution of sub-bottom data as a form of interference. These types of noise have frequencies similar to those of effective signals, exhibit strong amplitudes, and can appear anywhere on seismic records. Although existing median filtering techniques can suppress such interference waves, they may also degrade the effective signals to a certain extent. This paper proposes an improved switching median filtering method. The method first identifies the location of the interference waves in the sub-bottom profile using the Median Absolute Deviation (MAD) criterion, and then applies median filtering to denoise signals in the vicinity of interference, while leaving noise-free signals unaltered. Applying this method to sub-bottom profiles obtained from the South Yellow Sea shelf showed that the proposed improved switching median filter could effectively attenuate acoustic interference similar to multibeam pulses while minimizing the loss of effective signals compared to previous methods.
- sub-bottom profiling,
- multibeam pulse,
- MAD,
- switching median filter.

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References(25)

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