小波模极大值匹配算法的瞬变信号检测

Transient Signal Detection Method Based on Wavelet Transform Matched Modulus-maximum

分析了井下电磁脉冲数据传输中接收到的瞬变信号和噪声的小波变换模极大值在各尺度上的特点。在此基础上,结合匹配滤波器理论提出了瞬变弱信号小波变换模极大值匹配算法,该算法可以有效的区分信号与噪声的最佳尺度模极大值并检测信号。仿真结果表明,与小波模极大值方法相比,匹配算法实现瞬变弱信号的检测更为有效。

The characteristics of wavelet transform modulus-maximum of transient signal and noise which are re- ceived from electromagnetic-pulse along the well bore are analyzed. An algorithm which combines the wavelet trans- form modulus-maximum method with matched filter theory is proposed for weak-transient signal detection. The algo- rithm is used to distinguish the best scale modulus-maxima of transient signal from that of noise. Simulation results indicate that the proposed algorithm is more effective for weak-transient signal detect than traditional modulus-maxi- ma method.