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A Deterministic Sea-Clutter Space–Time Model Based on Physical Sea Surface

机译：基于物理海面的确定性海杂波时空模型

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摘要

In the conventional space-time signal model, the statistical amplitude of the clutter is assumed to be a specific distribution. For sea clutter, a pulse-to-pulse correlation matrix is added to the temporal covariance matrix to describe the motion of the sea surface. However, such sea clutter model cannot reflect the property of the sea clutter. In this paper, a space-time model for the sea clutter is presented based on the physical sea surface model, in which the clutter amplitude is deterministic instead of statistic. The reflectivity and the radial velocity of the sea clutter for any specific position and time are computed based on the physical sea surface. Both the aforementioned two factors vary with time, which corresponds to the time variation of the sea surface. Moreover, the spatial channel decorrelation is modeled, which has an effect on the spatial covariance matrix of the sea clutter. The simulated angle-Doppler spectra and the signal-to-clutter-plus-noise-ratio loss show that the reflectivity of the sea clutter makes the space-time-adaptive-processing performance degrade, and the radial velocity of the sea clutter results in a more significant spread of the clutter power spectrum in sea state 4 than sea state 2. The Doppler spectrum can be acquired by the space-time model proposed in this paper instead of the experimental Doppler model for sea clutter. For a given sea state, the low range resolution has a more prominent effect on the power spectrum because of severer spatial channel decorrelation.
机译：在常规的时空信号模型中，杂波的统计幅度被假定为特定分布。对于海杂波，将脉冲间相关矩阵添加到时间协方差矩阵以描述海面的运动。但是，这种海杂波模型不能反映海杂波的特性。本文基于物理海面模型，提出了海杂波的时空模型，其中杂波幅度是确定性的，而不是统计性的。根据物理海面计算任何特定位置和时间的海杂波的反射率和径向速度。前述两个因素均随时间变化，这对应于海面的时间变化。此外，对空间信道去相关进行了建模，这对海杂波的空间协方差矩阵有影响。模拟的角度多普勒谱和信噪比加噪声比表明，海杂波的反射率使得时空自适应处理性能下降，导致杂波的径向速度下降。海态4中的杂波功率谱比海态2中的分布更显着。可以通过本文提出的时空模型而不是实验性的海杂波多普勒模型来获取多普勒频谱。对于给定的海况，由于更严格的空间信道去相关性，低距离分辨率对功率谱的影响更为显着。

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