|本期目录/Table of Contents|

[1]陈沁根,张兴敢*.基于时频分析-随机Hough变换的微动目标参数快速提取[J].南京大学学报(自然科学),2017,53(6):1178.[doi:10.13232/j.cnki.jnju.2017.06.020]
 Chen Qingen,Zhang Xinggan*.Rapid extraction of parameters of Micro-Motion target based on time-frequency analysis and random Hough transformation[J].Journal of Nanjing University(Natural Sciences),2017,53(6):1178.[doi:10.13232/j.cnki.jnju.2017.06.020]
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基于时频分析-随机Hough变换的微动目标参数快速提取()
     

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

卷:
53
期数:
2017年第6期
页码:
1178
栏目:
出版日期:
2017-12-01

文章信息/Info

Title:
Rapid extraction of parameters of Micro-Motion target based on time-frequency analysis and random Hough transformation
作者:
陈沁根张兴敢*
南京大学电子科学与工程学院,南京,210023
Author(s):
 Chen Qin’genZhang Xinggan*
 School of Electronics Science and Engineering,Nanjing University,Nanjing,210023,China
关键词:
 非线性调频信号时频分析时频脊随机Hough变换
Keywords:
 non-linear frequency modulation signaltime-frequency analysistime-frequency ridgerandom hough transformation
分类号:
TN951
DOI:
10.13232/j.cnki.jnju.2017.06.020
文献标志码:
A
摘要:
研究了微动目标的参数与其微多普勒特征之间的关系,针对旋转目标的微多普勒信号表现为三参数正弦调频信号的特点,提出了一种正弦调频信号参数快速提取算法.该方法对目标信号进行时频分析,并对分析的结果进行时频脊的提取,获得正弦调频信号的频率变换曲线.最后在提取的时频变换曲线上进行正弦曲线的随机Hough变换检测,从而得到正弦调频信号的参数估计.当信噪比较小时,该方法的估计精度优于Time Frequency Distribution-Hough(TFD-Hough)变换方法.当信噪比较大时,两种方法的估计精度相当,但该方法的运算时间优于TFD-Hough变换方法.仿真实验结果表明,相对于TFD-Hough变换方法,该方法的运算量明显减少,当信噪比为0时,该方法的运算时间约为TFD-Hough变换方法的19.9%.在计算精度方面,该方法的计算精度与TFD-Hough变换方法相当.
Abstract:
 The distinction of warhead and decoys is one of the main technological bottlenecks in ballistic missile defense system,which determines the success or failure of the anti-missile system to some extent.Micro-motion is commonly referred to small mechanical vibrations or rotation in addition to mass translation which may induce additional frequency modulation on the received target echoed signal,called micro-Doppler effect.In academia,the characteristic of micro-motion is considered as one of the most effective features in ballistic midcourse target recognition.The extraction of the micro-motion characteristics offers new measures for target recognition in ballistic missile defense,and it plays an important role in target recognition.This paper addresses the relationship between parameters of the micro-motion of micro-target and their micro-Doppler features.Based on the characterization of micro-Doppler signal of rotation target featuring sinusoidal frequency modulation signal with three parameters,we proposed a rapid extraction algorithm with small amount of calculation for sinusoidal frequency modulation signal parameters.Firstly,the time-frequency analysis was used to deal with the signal of the target.Secondly,the time-frequency ridge extraction was utilized to get the curve of the frequency conversion.Finally,the random Hough transformation of sinusoidal curve was applied to evaluate the time-frequency curve which is gotten by time-frequency ridge.When the signal to noise ratio(SNR)is small,the estimation precision of the method given in this paper is better than Time Frequency Distribution Hough transformation(TFD-Hough)and when SNR is relatively large,the estimation accuracy of two methods is equivalent.Results of the simulation experiments indicated that compared with TTFD-Hough,the method given in this paper has a greater advantage in calculated amount.When the SNR is 0,the computation time of the method is about 19.9% of TFD-Hough and when the SNR is -10 dB,the computation time of the method is only 11.2% of TFD-Hough.

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相似文献/References:

备注/Memo

备注/Memo:
 基金项目:江苏省基础研究计划(BK20151391)
收稿日期:2017-04-25
*通讯联系人,E-mail:zhxg@nju.edu.cn
更新日期/Last Update: 2017-11-28