基于实测数据的Ka波段海杂波极化特性研究

文中介绍了获取Ka波段海杂波的试验条件，并利用获取的实测数据进行了杂波特性分析.发现:HH极化与VV极化下海杂波的幅度分布区别不大，与瑞利、韦布尔及K分布拟合程度较为接近，与理论分析基本一致；海杂波时间相关性很短，在不同极化方式下变化不大；其空间相关长度约为4 m，且随着擦地角增加而略有增加.此外比较分析了HH和VV两种极化下海杂波后向散射系数随擦地角的变化趋势，在低擦地角情况下，VV极化条件下的海杂波后向散射系数高于HH极化.本文的研究结果为海杂波背景下低空小目标的检测研究提供了更加丰富有利的支撑.

Polarization characteristics of Ka-band sea clutter based on measured data

An experimental system for Ka-band sea clutter measurement is introduced in this paper. Based on the measured data, the sea clutter characteristics are analyzed. It is found that the amplitude distribution of sea clutter data is close to the Rayleigh, Weibull and K distributions and it has slight differences in horizontal and vertical polarization when the grazing angle is low. The temporal correlation of sea clutter is very short and almost the same in different polarization modes. The spatial correlation length is about 4 m and increases slightly with the increase of grazing angle. In addition, the trend of the backscattering coefficient of sea clutter under the two polarizations of HH and VV is compared and analyzed. The results show that the backscattering coefficient of sea clutter under VV polarization is higher than that under HH polarization, which provides support for low-altitude small target detection concerning the sea clutter.