基于多普勒谱非广延熵的海面目标检测方法  

Small Target Detection in Sea Clutter Background Based on Tsallis Entropy of Doppler Spectrum

作　　者：陈世超[1] 罗丰[1] 胡冲 聂学雅 CHEN Shichao;LUO Feng;HU Chong;NIE Xueya(National Laboratory of Radar Signal Processing,Xidian University,Xi’an 710071,China;Southwest China Institute of Electronic Technology,Chengdu 610036,China)

机构地区：[1]西安电子科技大学雷达信号处理国家重点实验室,西安710071 [2]西南电子技术研究所,成都610036

出　　处：《雷达学报（中英文）》2019年第3期344-354,共11页Journal of Radars

基　　金：国家重大科学仪器设备开发专项资金(2013YQ20060705)~~

摘　　要：根据海杂波和目标多普勒谱的聚集性差异,可以用熵特征来检测海杂波背景下的小目标,然而常用的香农熵仅仅是统计学角度的宏观量值,并不能反映出海杂波的非线性特性。非广延熵是香农熵的推广,可以描述海杂波已被证实的多重分形特性。该文首先给出了非广延熵与分形维数的关系,然后结合有目标单元回波的多普勒谱较纯杂波单元回波的多普勒谱聚集性更强以及海杂波回波具有多重分形特性的特点,提出了基于多普勒谱非广延熵的海杂波背景下的小目标检测方法,最后通过实测数据进行实验比较,验证了该文算法的有效性,在观测时间较短的情况下,与现有的多重分形频域Hurst指数方法和基于香农熵的方法相比,该文算法具有更好的检测性能。According to the different concentration levels of Doppler spectrum between sea clutter and target,small target in sea clutter background can be detected using Shannon entropy.However,Shannon entropy is merely a special case of Tsallis entropy and cannot reflect the multifractality of sea clutter.In this paper,the relation between Tsallis entropy and the generalized fractal dimension is first presented,and then the Doppler spectrum’s concentrative level and multifractality of sea clutter are combined;finally an algorithm for detecting small target in sea clutter background based on Tsallis entropy of Doppler spectrum rather than of Shannon entropy is proposed.By comparison via IPIX dataset,the detection’s performance of Tsallis entropy is better than that of Shannon entropy and Hurst exponent as per short observations.

关 键 词：海杂波 目标检测 多普勒谱 非广延熵 多重分形 

分 类 号：TN959.72[电子电信—信号与信息处理]