基于DBF的超分辨率方位分割算法的初步研究

基于DBF的超分辨率方位分割算法的初步研究 Initial Study on Super-Resolution Direction Subdividing Algorithm Based on DBF 杨绍麟 YANG Shao-lin 1 2 first-author 柯亨玉 KE Heng-yu 1 2 丁毅敏 DING Yi-min 1 2 吴世才 WU Shi-cai 1 2 杨子杰 YANG Zi-jie 1 2 武汉大学电子信息学院 武汉大学电子信息学院 School of Electronic Information, Wuhan University School of Electronic Information, Wuhan University 武汉大学电子信息学院,湖北,武汉,430072 武汉大学电子信息学院,湖北,武汉,430072 针对高频地波雷达海洋环境遥感技术中的角分辨率问题 ,提出了基于数字波束形成 DBF（DigitalBeam Foming）的方位分割 DD（Direction- sub Dividing）算法 .该算法将待测海域分割成小的方位元 /海元 ,以 DBF方式实现接收波束扫描 ,获得陈列在不同指向的接收波束下海洋回波的多个接收值 ,再通过奇异值分解得到最小二乘意义上每个海元的后向散射回波 ,进而实现方位超分辨率的海洋环境参数的提取 .文中阐述了算法的基本思想 ,给出了部分模拟结果 ,最后指出了算法目前存在的不足 In this paper, a super-resolution Direction subDividing （DD） algorithm based on Digital Beam Forming（DBF） is developed for ocean environment remote sensing with HF ground wave radar. The algorithm separates the sea echo from different bearings in the radar’s transmitting beam to realize super-resolution extraction of ocean surface parameters, such as wave, wind and surface current. In the algorithm processing, a range cell of the illuminated area of the radar is firstly subdivided into smaller direction cells or sea cells. DBF is applied to scan the receiving beam, and gets sea echo power in each scanning direction. Singular Value Decomposition （SVD） is then applied to get the sea echo cross-section from every direction cell in the least-squared sense. Spatial super-resolution for ocean environmental parameters extraction is realized in this way. The advantages and disadvantages of the DD algorithm are analyzed, and some simulation results are given in the end of this paper. 高频地波雷达 海洋回波 空间超分辨率算法 数字波束形成 HF ground wave radar sea echo spatial super-resolution algorithm digital beam forming TN959.52 国家 8 63计划资助项目 （863 -818-0 1-0 2 ） 2001-05-01 2021-04-01 5