NON-STATIONARY SPECTRUM ANALYSIS OF OCEAN WAVES

Mehmet Aziz Tayfun, Cheng Yi Yang, George Chia-Chu Hsiao

Abstract


Priestley's method [1, 2, 3] of non-stationary spectral analysis is extended to the case of digitally sampled records. A computation procedure previously proposed in an earlier work [4] is further investigated. This procedure compensates for the inherent difficulties in the theory and computes timedependent spectra from a sample in an iterative manner. Validities of the theory and the iterative procedure are tested with a simulated non-stationary process. Results establish a general agreement with theory, especially when spectra vary smoothly with time and frequency. Consequently, the procedure is applied to estimate non-stationary spectra for two wave records. A comparison is made between the non-stationary estimates and the stationary results derived from the same set of wave records.

Keywords


spectral analysis; non-stationary spectrum analysis

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