TY - JOUR T1 - A time-frequency application with the Stokes-Woodward technique A1 - Elfouhaily,Tanos A1 - Guignard,S A1 - Branger,H A1 - Thompson,D A1 - Chapron,Bertrand A1 - Vandemark,D AD - CNRS, Inst Rech Phenomenes Hors Equilibre, F-13384 Marseille, France. AD - Johns Hopkins Univ, Appl Phys Lab, Laurel, MD 20723 USA. AD - IFREMER, Dept Oceanog Spatiale, F-92138 Issy Les Moulineaux, France. AD - Univ New Hampshire, OPAL, Durham, NH 03824 USA. UR - https://archimer.ifremer.fr/doc/00000/744/ DO - 10.1109/TGRS.2003.817202 KW - Wind waves KW - Wave wave interaction KW - Vertical asymmetry KW - Time frequency distributions KW - Nonlinear hydrodynamic processes KW - Mode coupling KW - Instantaneous frequency KW - Instantaneous amplitude KW - Horizontal asymmetry KW - AM FM KW - Amplitude modulation frequency modulation N2 - In a recent paper, we have generalized Woodward's theorem and applied it to the case of random signals jointly modulated in amplitude and frequency. This generalization yields a new spectral technique to estimate the amount of energy due to mode coupling without calling for higher order statistics. Two power spectra are detected; the first is related to the independent modes, and the second contains extra energy caused by mode coupling. This detection is now extended from frequency to time-frequency domain. A comparison between a wavelet transform and our time-frequency technique shows good agreement along with new insight into the time occurrence of the nonlinearities or mode coupling. An application to water surface waves is given in this letter as an example. Y1 - 2003/11 PB - IEEE JF - IEEE Transactions on Geoscience and Remote Sensing SN - 0196-2892 VL - 41 IS - 11 SP - 2670 EP - 2673 ID - 744 ER -