Abstract: Wavelet Processing is an important technique used to im-prove the resolution of seismic data, in which the key is wavelet estimation. According to the fact that higher order cumulate re-tains phase information, a method of wavelet estimation based on bispectrum of seismic signals is provided in this paper. The method does not need the traditional assumption that the
wavelet must be minimum-phase, and is valid for wavelet of any phase. Applicability of the method is proved by theoretical calculations on seismic wavelet with different phase properties,showing the potential of higher-order signal spectra in wavelet processing and resolution improvement.

Key words: wavelet estimation, higher-order cumulate, higher-order spectra, deconvolution