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利用合成孔径技术提取表层海流的新算法
引用本文:薛文虎,韩树宗,朱三文,唐劲松.利用合成孔径技术提取表层海流的新算法[J].现代雷达,2007,29(8):116-120.
作者姓名:薛文虎  韩树宗  朱三文  唐劲松
作者单位:1. 海军工程大学,武汉,430033
2. 中国海洋大学,山东,青岛,266003
基金项目:国家高技术研究发展计划(863计划)
摘    要:为满足高频地波雷达单站提取表层海流的需求,提出了一种利用合成孔径技术提取表层海流的新算法,并通过仿真验证其可行性。首先描述系统组成、实现方式和信号模型,然后基于线性调频信号参数的迭代估计方法提出了流速估计算法,最后实现了在一个海域分辨单元上提取表层海流的仿真试验。结果表明,通过选取适当的方位分辨单元大小,并从方位向回波中提取信号参数,该算法能够估计出表层海流的流速和流向,且精度满足要求。这表明利用高频地波合成孔径雷达实现单站提取表层海流在理论上是可行的。

关 键 词:合成孔径雷达  高频地波  速度估计  表层海流
修稿时间:2007-03-122007-07-16

A Novel Algorithm on Extracting Sea Surface Current by Synthetic Aperture Technique
XUE Wen-hu,HAN Shu-zong,ZHU San-wen,TANG Jin-song.A Novel Algorithm on Extracting Sea Surface Current by Synthetic Aperture Technique[J].Modern Radar,2007,29(8):116-120.
Authors:XUE Wen-hu  HAN Shu-zong  ZHU San-wen  TANG Jin-song
Affiliation:1. Naval Univ. of Eng, Wuhan 430033, China; 2. Ocean Univ. of China, Qingdao 266003, China
Abstract:To meet the requirement of extracting surface current by a single station of HF surface wave radar, we present a novel algorithm by synthetic aperture technique in this paper. Also we verify the feasibility of this algorithm by simulation. Firstly the composition, implementation and signal model are described. Then the velocity estimation algorithm is introduced based on an iterative approach to estimate the parameters of chirp signals. Finally, numerical experiment of extracting surface current is implemented for a single resolution cell. The results show that if the size of a resolution cell in azimuth direction is properly chosen, the velocity of surface current can be estimated by extracting signal parameters from the azimuth echo. The precision is enough to meet the requirements. It indicates that high frequency SAR is theoretically feasible to be used in surface current extraction by a single station.
Keywords:SAR  HF surface wave  velocity estimation  surface current
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