S变换时变滤波在去噪处理中的应用研究

针对常用的滤波去噪方法都受到使用条件的限制,实际资料的滤波去噪不能达到良好效果,S变换时变滤波克服了传统滤波去噪方法滤波因子不能随时间、频率变化而变化的缺陷。将地震资料用S变换方法变换到时频域,对不同时间内不同频率的噪声部分充零,再将去噪后的地震数据利用S反变换到时间域,以获得所需要的有效信号。通过理论计算分析和实例计算表明,S变换时变滤波能够有效去除不同时段、不同频率的噪声。该方法具有一定的可行性。

APPLICATION RESEARCH ON TIME VARIABLE FILTERING WITH S-TRANSFORM IN DENOISING PROCESSING

There are several kinds of filtering methods to diminish the noises.However,all of them are restricted by operating conditions,as a result,a satisfactory effect of filtering can not be obtained from actual data.Time variable filtering with S-transform overcomes the shortage that the filtering factors in traditional filtering and denoising approaches will not change with time and frequency variation.Seismic data are transformed to time-frequency domain by using the S-transformation methods,then,the noises at different time intervals and with different frequencies are zeroized partly.Finally,the seismic data after noise elimination are transformed into time domain again by using S-inverse transformation to achieve the effective signals needed.Based on theoretical and real seismic data calculation,it is believed that S-transform is really an effective method eliminating noises at different time intervals and with different frequencies.