SAR探测水下运动物体波浪尾迹的模拟研究

水下运动物体可以在海面产生波浪,这种波浪与海洋表面波相互作用改变了海浪谱的高低频分布而形成波浪尾迹。将这样的波-波相互作用处理为对背景海浪谱的扰动,利用海面微波散射的二尺度模型,分析波浪尾迹对雷达散射系数的影响,并给出相应的数值计算模型;对水下不同运动状态物体的波浪用汇源分布法计算出波面函数,将它们分别与一些特定海况的海浪波面函数叠加,并对之进行微波后向散射测量仿真计算,给出波浪尾迹的SAR(Synthetic Aperture Radar、合成孔径雷达)探测图像;再利用二维谱分析技术对模拟SAR图像进行处理,提取波浪尾迹信息。初步结果表明,SAR探测下运动物体是可行的。

Simulation Research of Wave Wake Detect of Underwater Mobile Using SAR

Submerged mobile bodies can produce waves on the sea surface. These waves' interacting with sea waves can change the distribution of high or low frequency of sea wave spectrum, and form the wave wake of the submerged mobile bodies. In the article, the wave-wave interaction is viewed as the perturbing of waves spectrum to the backgrounds. In the article, we analyze the effect of waves wake on the radar backscatter coefficient according to the two-scale model and get the numerical simulations model. Then,we calculate the wave function with the converge-source distribution methods on the submerged mobilebodies in different moving states, which is added to the wave functions of different states of the sea; we carry on the emulating calculation of the radar backscatter variations, and get the simulated SAR detecting image. At last, we process to the simulated SAR image with the 2D spectrum analysis technique, and extract the info of waves wake. The preliminary results indicate that the detection of submerged mobile bodies with SAR is feasible.