海面目标雷达回波中多径延迟的概率模型

为了研究海面多径效应在雷达目标图像中的影响，将海面建模为满足基尔霍夫近似条件的粗糙面，从而建立电磁波在目标散射中心与起伏海面之间传播的几何路径。然后,通过引入海面的波高-斜率联合概率密度函数，导出雷达回波中多径延迟的概率模型。通过与电磁仿真结果的对比验证了模型的有效性，并且分析了多径延迟与散射中心高度、雷达俯仰角以及海面特征参数的密切联系。最后，给出了其在海面目标识别研究领域应用的例子。

Probability model of multipath delay in radar echoes of sea surface objects

To study the effect of multipath propagation on the radar image of sea objects,the work endues the sea surface with the Kirchhoff approximation.Under this assumption,the propagating route of the incident wave is formed geometrically between the object scattering center and the sea surface.The joint probability density function of the sea elevations and slopes is introduced,and the probability model of the multipath delay in radar echoes is accordingly established.The model validation is accomplished through the comparison with electromagnetic simulations.Its relationship with the scattering center height,the radar elevation angle,and the sea characteristic parameters is analyzed.In the end,some examples illustrate the application of the model in the field of sea object recognition.