A Method for Suppressing Optical Cable Coupling Noise Based on Sparse Optimization in Time-Frequency Domain

Abstract

The invention discloses a cable coupling noise suppression method based on sparse optimization of a time-frequency domain. The method comprises the steps of 01, determining two conversion dictionaries for morphological component analysis according to morphological characteristics of an effective signal waveform and cable coupling noise, and forming an over-complete dictionary; 02, performing single track treatment on original seismic record data by using a segmented coordinate relaxation algorithm to achieve signal and noise separation, thus acquiring primarily noise-suppressed data; 03, performing high-pass filtering treatment on the primarily noise-suppressed data, subtracting the high-pass filtered noise data from the original data to acquire the effective signal data, thus eliminating wave dispersion; and repeating the steps 02-03 until the data of all tracks is processed. According to the method provided by the invention, the problem of interference of the cable coupling noise in the seismic data collected by distributed optical fibers is solved, and the cable coupling noise is thoroughly suppressed. In addition, the method provided by the invention can perform single-shot treatment, is good in adaptation, and can perform treatment in parallel, and meet industrial large-scale computing requirement.

Description

technical field [0001] The invention relates to the field of signal processing, in particular to a method for suppressing optical cable coupling noise in the field of seismic exploration. Background technique [0002] Since the 1970s, with the great development of optical fiber and optical fiber sensing technology, optical fiber has been widely used in the field of communication sensing. Distributed optical fiber sensing technology utilizes the characteristics of optical fiber itself to use optical fiber as a sensitive element, with high resolution, small error, and long measurement distance, which can realize long-distance measurement and monitoring, especially suitable for large-scale multi-point measurement, and can accurately measure the optical fiber Information about temperature, vibration, and damage at each point along the line. Compared with traditional sensors, distributed optical fibers have the advantages of anti-electromagnetic interference, anti-corrosion, hig...

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Problems solved by technology

[0006] (1) This method needs to identify noise channels, and sometimes the individual channel data of weak optical cable coupling noise cannot be detected

[0007] (2) This method is based on obtaining simulated noise and subtracting it, but the form of coupled noise of different seismic data is complex, so sometimes it will lead to incomplete denoising or damage to effective signals

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