Sound signals are imperfectly reflected and partly scattered by sea surfaces that are randomly rough. Fluctuations of the sound reflected from the sea surface affect the sound propagation characteristics for ocean measurements. In this paper, we present the experimental estimation results on fluctuations of sound reflected from the sea surface. The quadrature components of the received signal were plotted on the complex plane. The relation between the fluctuation and the rough surface statistics was discussed. The distribution of the component vector is asymmetrical on the complex plane. The reflected points below the average height of surface are more than the points above the average surface. The fluctuation of the reflected points below the average surface is smaller than the fluctuation of the reflected points above the average surface.

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