A JOINT INVERSION ALGORITHM FOR THIN LAYER
IDENTIFICATION USING CEPSTRUM
1)School of Mechanical and Electrical Engineering, Guizhou Normal University, Guiyang 550001
2)School of Information Science and Technology, Xiamen university,Xiamen 361005
Abstract A joint inversion method using cepstrum was presented for solving thin layers recognition problem in the frequencydomain inversion algorithm of layered media. In the case of lack of any priori information, it is possible to use trueficnitious cepstra method to recognizing thin layers, for the quefrency peaks indicate reflection interfaces. The opperating steps are as the followings:(1)moving the phase of the ficnitious part in the spectrum of the coefficient series. (2）adding the results to the real part of the spectrum and calculating the cepstrum of sum. (3）comparing the quefrency spikes on the cepstrum of the sum with that of trueficnitious cepstrum. Thus, one can detemines if the spike represents a thin layer.
