SIMULTANEOUS GROUP AND PHASE CORRECTION FOR THE ESTIMATION OF DISPERSIVE PROPAGATING WAVES IN THE TIME-FREQUENCY PLANE

This paper deals with seismic signal processing. We pro-pose a new algorithm which performs the dispersion filter estimation using a linear array of geophones. This estima-tion enables a robust characterization and extraction of the dispersive propagating waves from a seismic profile. The novelty of our method is the use of a simultaneous time de-lay and phase shift correction in order to estimate the dis-persion filter. The resulting algorithm is semi-automatic and requires very few input parameters. The main advantage of our algorithm is that the signals are analysed in the time-frequency domain using all sensors simultaneously while classical approches are either multi-sensor in the frequency domain or single sensor in the time-frequency domain. Val-idations on synthetic and real data show the reliability of the algorithm. 1