8XIANG Min, WANG Zhu-wen, LIU Jing-hua. Extrac-ting array acoustic logging signal information by combi- ning fractional Fourier transform and Choi-Williams dis- tribution [ J ]. Applied Acoustics, 2015, 90 : 111-115.
9Morris R L, Grine D R, Arkfeld T E. Using compres- sional and shear acoustic amplitudes for the location of fractures [ J]. Journal of Petroleum Technology, 1964, 16 (6) : 623-632.
10Cohen L. Generalized phase-space distribution functions [J]. Journal of Mathematical Physics, 1966, 7 (5): 781-786.