Wavelet transform has been widely used in signal processing.The wavelet base greatly influences the result of signal processing.The purpose of processing the signal of wireless measurement while drilling is to obtain the optimal wavelet base and its parameters for noise abatement processing.Correlation coefficient is tentatively used as the criterion to estimate the processing result of mud wave signal.7 wavelet bases with different parameters are tried to process a raw signal,then the processed signals are...
【更新日期】
2007-10-24
【分类号】
TE271
【正文快照】
0引言目前国外较多地用钻井液(泥浆柱)作为信道进行信号传输,称为泥浆信道随钻测量MWD(Meas-urement While Drilling)。在泥浆信道MWD中,由于现场测量条件的影响,安装在立管上检测泥浆压力波动的压力传感器的输出,不仅包含井下传来的有用信号,而且含有由于泥浆泵压缩泥浆而引起