Scattering from the Time‐Varying Surface of the Ocean
Scattering from the Time‐Varying Surface of the Ocean
复制标题
从随时间变化的海洋表面散射
DOI：
10.1121/1.1910715
复制
发表时间：
1967
影响因子：
2.4
通讯作者：
B. Parkins
中科院分区：
文献类型：
--
作者：
B. Parkins
使用远区再辐射压力的谱密度来描述由海洋的移动粗糙表面再辐射的单色声学平面波的频率扩展。该压力是使用物理光学方法计算的，用于假设由Neumann-Pierson方向波谱描述的表面。结果专门用于轻微粗糙和非常粗糙的风产生的海洋的情况。对于稍微粗略的情况，谱密度包含入射辐射频率处的镜面反射分量和从入射辐射频率多普勒频移等量的两个单色散射分量。每个多普勒频移频率的偏差大小是相同的，取决于入射角和相对于风向的观测角，也取决于入射频率。对于非常粗糙的表面情况，远区再辐射压力的谱密度为高斯分布。
The frequency spreading of a monochromatic acoustic plane wave reradiated by the moving, rough surface of the ocean is described using the spectral density of the far‐zone reradiated pressure. This pressure is calculated using the method of physical optics for a surface assumed to be described by the Neumann‐Pierson directional wave spectrum. The results are specialized for the cases of slightly rough and very rough wind‐generated seas. For the slightly rough case, the spectral density contains a specularly reflected component at the frequency of the incident radiation and two monochromatic scattered components that are Doppler‐shifted by equal amounts from the frequency of the incident radiation. The magnitude of the deviation of each of the Doppler‐shifted frequencies is the same and depends on the angles of incidence and observation relative to the wind direction and also on the incident frequency. For the very rough surface case, the spectral density of the far‐zone reradiated pressure is of Gaussian ...