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海面掠入射散射特性对海洋遥感等问题有着重要应用,海面对雷达波束的镜面反射对海上超低空目标与海面的耦合场有着重要影响,利用海面的布儒斯特效应将有效削弱镜面反射。以西太平洋和东南沿海盐度场与温度场的卫星数据为基础,根据双Debye方程建立修正海水介电模型计算不同海域介电常数;基于Elfouhaily海谱模型,采用修正双尺度模型并考虑不同风速及频率下的截断波数,仿真分析了风速、频率、海水温度与盐度等因素对海面掠入射散射特性及布儒斯特效应的影响,总结归纳了海面布儒斯特效应产生机理和变化规律。分析表明:风速、频率及海水温度均会对海面布儒斯特效应产生影响。该研究为海洋环境的遥感探测及海上超低空目标的监测与跟踪提供了理论支撑。
The grazing incidence and scattering of the sea surface has an important application in ocean remote sensing and other issues. The specular reflection by the sea surface on the radar beam has an important influence on the coupling field between the sea surface and the target at sea, and the Brewster effect on the sea surface will effectively weaken the specular reflection. Based on the satellite data of the salinity and temperature fields in the western and southeastern coastal regions, a modified seawater dielectric model was established based on the double Debye equation to calculate the dielectric constant in different sea areas. Based on the Elfouhaily sea spectrum model, a modified two-scale model was adopted and different wind speeds and Frequency of truncated wavenumbers, the impact of wind speed, frequency, temperature and salinity of seawater on the grazing incidence and scattering characteristics of sea surface and the Brewster effect were simulated and analyzed. The production mechanism and variation rule of sea surface Hubster effect were summarized. The analysis shows that wind speed, frequency and sea temperature affect the Brewster effect of the sea surface. The study provides theoretical support for remote sensing exploration of ocean environment and monitoring and tracking of ultralow-altitude targets at sea.