CAJ | 학술논문

探讨在地震勘探中小波变换处理非平稳信号的时频分析方法，从强噪声地震信号中除去干扰进而提取有效信号。在 D．L．Dohono 提出的小波阈值去噪方法的基础上，提出了一种新的阈值函数用于非平稳强震降噪。该函数是介于硬、软阈值函数之间的一个可调函数，具有计算稳定性好、精度高、收敛速度快、对模型参数α的选择简单易于操作等特征。通过仿真实验和实际地震处理验证，表明所构造的新阈值函数能有效改善地震剖面处理效果，达到提高信噪比的目的。
탐토재지진감탐중소파변환처리비평은신호적시빈분석방법，종강조성지진신호중제거간우진이제취유효신호。재 D．L．Dohono 제출적소파역치거조방법적기출상，제출료일충신적역치함수용우비평은강진강조。해함수시개우경、연역치함수지간적일개가조함수，구유계산은정성호、정도고、수렴속도쾌、대모형삼수α적선택간단역우조작등특정。통과방진실험화실제지진처리험증，표명소구조적신역치함수능유효개선지진부면처리효과，체도제고신조비적목적。
In seismic exploration,how to remove the interference from the seismic signal with strong background noises and extract the effective signal is the key of the seismic data processing.Wavelet transform is a time-frequency analysis to process non-stationary signals.Based on the wavelet threshold de-noising method proposed by D.L.Dohono,a new threshold function used in the non-stationary earthquake reduction noise is presented.This function is an adjustable function between hard and soft threshold functions and has the good stability of computation,high precision,fast convergence speed.Its choice of model parameters is simple and easy to operate.The simulation results and the actual seismic data processing show that the new constructed threshold function can effectively improve the seismic data processing,in order to increase the signal to noise ratio.