Abstract
The arrival time and amplitude fluctuations of about 230-m propagation were analyzed for various source-receiver configurations using experimental data. The minutes-scale and seconds-scale fluctuations of the arrival time were observed on both the direct, surface-reflection and bottom-reflection arrivals while the minutes-scale fluctuation of the arrival amplitude was only observed on the direct arrivals. Cross-correlation coefficients and frequency spectrum of the fluctuation were calculated to explain the causes of the fluctuations. It shows that the movement of the source is an important cause for the fluctuations of the arrival time and the seconds-scale fluctuations of the arrival amplitude. The variability of the ocean structures contributes to both the arrival time and the amplitude fluctuations of the direct arrivals while the sea-surface scattering is the dominant cause for the surface-reflection arrivals. The fluctuation amplitudes of the bottom-reflection and the surface-reflection arrival ampl...
Published Version
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