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[1]顾智敏,张兴敢*,王 琼. FRFT域内的海杂波多重分形特性与目标检测[J].南京大学学报(自然科学),2017,53(4):731.[doi:10.13232/j.cnki.jnju.2017.04.016]
 Gu Zhimin,Zhang Xinggan*,Wang Qiong. Multifractal property and target detection of sea clutter in FRFT domain[J].Journal of Nanjing University(Natural Sciences),2017,53(4):731.[doi:10.13232/j.cnki.jnju.2017.04.016]
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 FRFT域内的海杂波多重分形特性与目标检测()
     

《南京大学学报(自然科学)》[ISSN:0469-5097/CN:32-1169/N]

卷:
53
期数:
2017年第4期
页码:
731
栏目:
出版日期:
2017-08-03

文章信息/Info

Title:
 Multifractal property and target detection of sea clutter in FRFT domain
作者:
 顾智敏张兴敢*王 琼
 南京大学电子科学与工程学院,南京,210023
Author(s):
 Gu ZhiminZhang Xinggan*Wang Qiong
 School of Electronic Science and Engineering,Nanjing University,Nanjing,210023,China
关键词:
 小目标分数阶傅里叶变换分形维轨迹截 距
Keywords:
 small targetFRFTfractal dimension trajectoryintercept
分类号:
TN957.51
DOI:
10.13232/j.cnki.jnju.2017.04.016
文献标志码:
A
摘要:
 如何从海杂波中检测小目标是雷达信号处理研究中的一个热点问题.海杂波具有多重分形特性,利用海杂波和目标回波分形特性的不同进行区分:海杂波的复杂性决定了其分形维值一般较大,而海面目标由于表面规则平滑而分形维值较小.实际检测小目标时,海杂波较强,需要对其进行抑制,提高信杂比.分数阶傅里叶变换(Fractional fourier transform,FRFT)是一种提高信杂比(Signal to clutter ratio,SCR)的良好方法:动目标经过FRFT后,在最佳变换域可形成峰值,而海杂波难以积累出有效峰值.结合这些特性,本文提出了在FRFT域内多重分形特性联合检测小目标的方法.在多重分形基础上,比较了时域和FRFT域分形维轨迹,证明了FRFT能有效聚集目标单元能量,加大了纯海杂波与目标的差异.将FRFT域多重分形维和截距联合起来作为检测小目标的二维判决空间,用实测数据证明了海杂波和小目标在判决空间存在明显的差异性,验证了本文所提方法有效地提高了海杂波中小目标检测的能力.
Abstract:
 How to detect small targets from sea clutter is a hot issue in radar signal processing.The sea clutter has multiple fractal characteristics and the small target detection is carried out by using different fractal characteristics between sea clutter and the target echo.The complexity of the sea clutter determines that the fractal dimension is generally larger and fractal dimension of target is smaller due to the smoothness of the surface.When detecting small targets,the sea clutter is strong and need to be suppressed.Fractional Fourier Transform(FRFT)is a good way to improve the signal to clutter ratio(SCR).After the FRFT of the moving target,the peak can be formed in the best transform domain.But the sea clutter is difficult to accumulate the effective peak.Combined with these characteristics,this paper proposes a method of combining multifractal features in FRFT domain.On the basis of multifractal characteristic,this paper compares the fractal dimension of time domain and FRFT domain,which proves that FRFT can effectively gather the energy of target unit and increases the difference between pure sea clutter and target unit.The multifractal dimension and intercept in FRFT domain are combined as a two-dimensional decision space for detecting small targets.Simulation with data of Ice Multiparameter Imaging X-Band Radar,the results proves that there is a significant difference between the sea clutter and the small target in the decision space.Meanwhile,it is verified that the method proposed in this paper can effectively improve the ability of small target detection in sea clutter.

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备注/Memo

备注/Memo:
 基金项目:江苏省基础研究计划(BK20151391)
收稿日期:2017-04-17
*通讯联系人,E-mail:zhxg@nju.edu.cn
更新日期/Last Update: 2017-08-02