Kelvin尾迹SAR图像仿真研究  

Study on the SAR imaging simulation of Kelvin ship wake

作　　者：巩彪[1] 黄韦艮[1] 陈鹏[1] 

机构地区：[1]国家海洋局第二海洋研究所卫星海洋环境动力学国家重点实验室,浙江杭州310012

出　　处：《海洋通报》2013年第2期208-213,共6页Marine Science Bulletin

摘　　要：一方面利用Kelvin尾迹水动力模型,通过对同一吃水深度(4 m)、不同船速(1-20 m/s)下的Kelvin尾迹波的仿真,提出了此模型适用的船只航行速度范围以及随着船速的变化,Kelvin尾迹波的变化情况。另一方面结合海表面波模型和雷达后向散射模型,比较同一船速、不同吃水深度(4 m、6 m和8 m)下的SAR仿真图像。结果表明,仅考虑Kelvin尾迹水动力模型时,当吃水深度不变时,在一定速度范围内,随船速的增大,Kelvin尾迹的横波波长逐渐增大,尖波变的逐渐清晰,超出此范围,Kelvin尾迹水动力模型就不再适用了;当同时考虑3种模型时,不同吃水深度下,在一定速度范围内,同一船速所仿真出的Kelvin尾迹SAR图像是不一样的,随着吃水深度的加深,Kelvin尾迹横波也随之清晰,超出此速度范围则无法看到横波。Based on the Kelvin ship wake model, this paper, on the one hand, simulated the Kelvin wake wave and proposed applicable range of ship speed and the changes of Kelvin wake wave with the change of ship speed, using the same draft （4 m） and different ship speeds （1-20 m/s）. On the other hand, combined with the sea surface model and Radar scattering model, the simulations of SAR imaging by the same ship speed and different drafts （4 m,6 m and 8 re）were compared. The results showed that in a certain speed range, ＇when draft was constant, with the increase of ship speed, the transve^e wave of Kelvin wake was getting longer and cusp wave became more clear gradually if only considering Kelvin wake model, and outside the range, Kelvin wake model was no longer useable. Based on the Kelvin ship wake model, the sea surface model and Radar scattering model, in a certain speed range, when ship speed was constant, the simulation of Kelvin ship wake SAR imaging was not the same under different drafts, and the deeper the draft was, the more clear the transverse wave of Kelvin wake was, and outside the range, the transverse wave eould not be seen any longer.

关 键 词：SAR 仿真 Kelvin尾迹 Kelvin尾迹水动力模型 海表面波模型 雷达后向散射模型 

分 类 号：TP75[自动化与计算机技术—检测技术与自动化装置]