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研究了海底表层沉积物的垂直密度梯度对底回波空间相关特性强度的影响。底回波散射截面与空间相关特性间的关系为:随入射角的增大,回波散射截面下降得越快,底回波空间相关特性越强。因此,将密度-深度模型引入海底高频回波模型进行回波仿真,计算回波的空间相关函数,通过分析密度梯度对底回波散射截面大小的影响,考察其对底回波空间相关特性强度的影响。从仿真分析结果可以看出,海底表层沉积物密度梯度对空间相关特性的影响较为显著,随着密度梯度的增大,回波散射截面变大且随入射角的增大下降趋势变快,空间相关半径变长,空间相关特性变强。
The effect of the vertical density gradient of sea floor sediment on the intensity of the bottom echo is studied. The relationship between the bottom echo scattering cross-section and the space-related characteristics is as follows: as the incident angle increases, the echo scattering cross-section decreases more rapidly and the bottom echo spatial correlation characteristics become stronger. Therefore, the density-depth model is introduced into the seafloor high-frequency echo model to simulate the echo and calculate the spatial correlation function of the echo. By analyzing the influence of density gradient on the bottom echo scattering cross-section size, The impact of strength. From the results of simulation analysis, it can be seen that the influence of density gradient of surface sediment on the spatial correlation is significant. As the density gradient increases, the cross section of echo scattering becomes larger and the decreasing trend becomes faster with the increase of incident angle. The relevant radius becomes longer and the space-related characteristics become stronger.