Quick Search:       Advanced Search
WANG Li,CHENG Yunfei,HONG Lijuan,LIU Xinyu. 2018. A novel algorithm for ocean wave direction inversion from X-band radar images based on optical flow method. Acta Oceanologica Sinica, 37(3):88-93
A novel algorithm for ocean wave direction inversion from X-band radar images based on optical flow method
基于光流法的X波段雷达浪向反演研究
Received:May 11, 2017  
DOI:10.1007/s13131-018-1201-9
Key words:X-band radar  optical flow  weighted average  ocean wave direction  radar image
中文关键词:  X波段测波雷达  光流运动估计  加权平均  浪向  雷达图像
基金项目:The National Key Research and Development Program of China under contract No. 2016YFC0800405; the Shanghai Municipal Science and Technology Project of China under contract No. 15DZ0500600; the Specialized Research Fund for the Doctoral Program of Higher Education of China under contract No. 2014212020203.
Author NameAffiliationE-mail
WANG Li 1. Third Research Institute, Ministry of Public Security, Shanghai 200031, China  
CHENG Yunfei 1. Third Research Institute, Ministry of Public Security, Shanghai 200031, China zou2013@whu.edu.cn 
HONG Lijuan 1. Third Research Institute, Ministry of Public Security, Shanghai 200031, China  
LIU Xinyu 1. Third Research Institute, Ministry of Public Security, Shanghai 200031, China  
Hits: 1231
Download times: 1267
Abstract:
      As one of the important sea state parameters for navigation safety and coastal resource management, the ocean wave direction represents the propagation direction of the wave. A novel algorithm based on an optical flow method is developed for the ocean wave direction inversion of the ocean wave fields imaged by the X-band radar continuously. The proposed algorithm utilizes the echo images received by the X-band wave monitoring radar to estimate the optical flow motion, and then the actual wave propagation direction can be obtained by taking a weighted average of the motion vector for each pixel. Compared with the traditional ocean wave direction inversion method based on frequency-domain, the novel algorithm is fully using a time-domain signal processing method without determination of a current velocity and a modulation transfer function (MTF). In the meantime, the novel algorithm is simple, efficient and there is no need to do something more complicated here. Compared with traditional ocean wave direction inversion method, the ocean wave direction of derived by using this proposed method matches well with that measured by an in situ buoy nearby and the simulation data. These promising results demonstrate the efficiency and accuracy of the algorithm proposed in the paper.
中文摘要:
      浪向代表着海浪传播方向,它是海上交通安全以及海岸资源管理的重要海洋环境参数之一。本文针对X波段测波雷达对海杂波的连续成像,提出了一种基于光流法的海浪传播方向反演新方法。该方法利用X波段测波雷达接收的海面回波图像序列直接进行光流运动估计,将得到的每个像素点的运动矢量进行加权平均,最后得到实际的海浪传播方向。与传统基于频域的X波段测波雷达浪向反演方法相比,本文提出的方法直接从时域来进行回波信号处理,无需提前得到调制传递函数以及精确的海流,减少了由于海流估算的不准确以及调制传递函数选取的误差而给雷达浪向反演带来的影响。同时,该方法简单高效,占用资源少,将其应用至仿真雷达回波以及现场实测数据来进行浪向反演,反演得到的浪向与仿真设定浪向值以及浮标实时观测浪向结果都有很好的吻合度,变化趋势也完全一致,进而验证了该方法的有效性以及准确性。
HTML View Full Text   View/Add Comment  Download reader
Close