宽带Ricker子波

地震数据处理的理想目标是得到反射系数，即子波是冲激函数。但由于受原始数据的频带和信噪比的限制，最终只能得到具有带限子波的记录。常用的子波是带通子波和Ricker子波。前者延续时间长，旁瓣波形复杂，后者旁瓣幅度比较大，都不是冲激函数的很好的近似。为此，设计了一种新的子波，它由不同宽度的Ricker子波合成，称为宽带Ricker子波。它的主瓣比较窄、旁辩幅度小、波形简单，在同样的主瓣宽度的情况下，振幅谱的峰值频率比较低，因而在保真度和信噪比方面都优于常用的两种子波。

Wide-band Ricker wavelet

The ideal target of seismic data processing is to get reflection coefficient,that is to say,the wavelet is impulse function. But limited by frequency band and signal/noise ratio of raw seismic data,we only get the record of bandlimited wavelets. The wavelets we often use are band--pass wavelet and Ricker wavelet. The former has long lasting period and complicated side--lobe waveforms, and the latter has high side--lobe amplitudes. Both of them are not the satisfactory approximation of im-- pulse function. So, I design a new wavelet, which is composed of some Ricker wavelets with different band widths, and called wide--band Ricker wavelet. The wide--band Ricker wavelet has narrow main lobe,small side--lobe amplitudes,simple waveform and low peak frequency of amplitude spectrum in the case of equal main lobe widths,so that it is superior to the common--used wavelets in the fidelity and signal/noise ratio.