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[1]文 乐,方 晖*,张兴敢.基于MUSIC算法的生命探测雷达信号处理方法[J].南京大学学报(自然科学),2016,52(5):946.[doi:10.13232/j.cnki.jnju.2016.05.022]
 Wen Le,Fang Hui*,Zhang Xinggan.Signal processing for life detection radar based on MUSIC algorithm[J].Journal of Nanjing University(Natural Sciences),2016,52(5):946.[doi:10.13232/j.cnki.jnju.2016.05.022]
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基于MUSIC算法的生命探测雷达信号处理方法()
     

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

卷:
52
期数:
2016年第5期
页码:
946
栏目:
出版日期:
2016-10-01

文章信息/Info

Title:
Signal processing for life detection radar based on MUSIC algorithm
作者:
文 乐方 晖*张兴敢
南京大学电子科学与工程学院,南京,210023
Author(s):
Wen LeFang Hui*Zhang Xinggan
School of Electronic Science and Engineering,Nanjing University,Nanjing,210023,China
关键词:
生命探测雷达多普勒频移生命回波模型MUSIC算法
Keywords:
the life detecton radardoppler frequency shiftlife echo modelMUSIC algorithm
分类号:
TN957.51
DOI:
10.13232/j.cnki.jnju.2016.05.022
文献标志码:
A
摘要:
生命探测雷达根据人体的体动、心跳和呼吸所产生的多普勒效应探测生命信息,是灾后搜救幸存者的重要工具.呼吸具有周期性,起伏的胸腔的回波比较强,其多普勒频移比较容易探测.呼吸频率通常是不均匀的,导致变化的胸腔具有多点反射,环境噪声强,据此建立了多个多普勒频移信号组合生命回波模型.研究用MUSIC谱估计从低信噪比回波中探测生命信息的方法,给出了探测处理框图.针对高信噪比回波和低信噪比回波,分别用FFT和MUSIC谱估计方法在一个雷达距离分辨单元上进行了生命信息探测仿真.仿真结果:FFT对高信噪比回波能检测出目标,低信噪比回波谱中生命信息被噪声谱线淹没;MUSIC谱估计能抑制噪声谱线,低信噪比回波谱中生命信息也比较明显,可以检测生命信息,表明MUSIC谱估计方法可以更可靠地在噪声背景下进行生命信息探测.
Abstract:
The life detection radar is developed for human life signals detection according to the doppler effect of body movements,breathing and heartbeat.It is widely used in rescuing survivors buried after disasters.Since respiratory signal has the characteristics of cyclical,and the echo signal of the undulating chest is strong,the doppler frequency shift is relatively easy to detect.According to the irregular respiratory frequency which lead to the changed thoracic cavity with multiple reflections,and the high noise background,the combination of multiple doppler frequency shift signals is established for the life echo model.In this paper,the method for detecting life information from low signal to noise ratio(SNR)echo signal by using MUSIC spectrum estimation is studied and the block diagram of the detection process is given as well.In the view of high SNR and low SNR,the FFT and MUSIC spectrum estimation methods are used to detect the life information on a radar range resolution unit.A number of tests in simulated conditions have shown the results as follows.In the high SNR echo,the FFT can detect the target,however,the life information of the low SNR echo spectrum is submerged by the noise spectral line;The MUSIC spectrum estimation method can suppress the noise spectrum,and the life information in the low SNR echo spectrum is also very obvious which can be detected.All of these results have indicated that the MUSIC spectrum estimation method can be used to detect the life information more reliably under the background of noise.

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备注/Memo

备注/Memo:
基金项目:毫米波国家重点实验室开放课题(K201514)
收稿日期:2016-03-16
*通讯联系人,E-mail:fanghui@nju.edu.cn
更新日期/Last Update: 2016-09-25