基于多通道的调频连续波雷达生命信号提取

屈乐乐; 刘淑杰; 杨天虹; 孙延鹏

doi:10.11999/JEIT211073

基于多通道的调频连续波雷达生命信号提取

doi: 10.11999/JEIT211073

沈阳航空航天大学电子信息工程学院沈阳 110136

基金项目: 国家自然科学基金(61671310)，辽宁省兴辽英才计划基金(XLYC1907134)，航空科学基金(2019ZC054004)，辽宁省教育厅科学研究基金(LJKZ0172, JYT2020015)

详细信息

作者简介:
屈乐乐：男，1983年生，教授，研究方向为超宽带雷达信号处理技术

刘淑杰：女，1996年生，硕士生，研究方向为生命雷达信号处理技术

杨天虹：女，1982年生，讲师，研究方向为雷达信号处理技术

孙延鹏：男，1973年生，教授，研究方向为雷达信号处理技术

通讯作者:
屈乐乐　qulele83@126.com

中图分类号: TN957
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- 被引次数: 6
出版历程
- 收稿日期: 2021-10-08
- 修回日期: 2022-03-15
- 录用日期: 2022-03-16
- 网络出版日期: 2022-03-21
- 刊出日期: 2022-04-18

Life Signal Extraction Based on Multi-channel Frequency Modulated Continuous Wave Radar

College of Electronic Information Engineering, Shenyang Aerospace University, Shenyang 110136, China

Funds: The National Natural Science Foundation of China (61671310), The Xingliao Talents Program Foundation of Liaoning Province (XLYC1907134), The Aeronautical Science Foundation of China (2019ZC054004), The Scientific Research Foundation of the Education Department of Liaoning Province (LJKZ0172, JYT2020015)

摘要

摘要: 针对单通道调频连续波(FMCW)雷达不能保证生命信号检测准确度的问题，该文提出一种基于多通道的FMCW雷达生命信号提取方法。所提方法对各等效接收通道进行距离像重构和相位信号提取后，首先采用最大比率融合(MRC)技术对各通道提取的相位信号进行融合，接着对融合后的相位信号进行变分模态分解(VMD)并对生命信号进行重构，最后对重构信号进行快速傅里叶变换(FFT)得到呼吸和心跳信号频率。实测数据处理结果表明相比于单通道FMCW雷达，所提多通道方法能够更加稳健准确地提取生命体征信号，且结合MRC技术与VMD的信号处理方法明显优于结合MRC技术与带通滤波(BPF)的信号处理方法。
- 多通道FMCW雷达 /
- 最大比率融合 /
- 变分模态分解 /
- 生命信号重构
Abstract: In order to solve the problem that the Frequency Modulated Continuous Wave (FMCW) radar could not guarantee the detection accuracy of life signal, a life signal extraction method based on multichannel FMCW radar is proposed in this paper. After the proposed method achieves the reconstruction of the range profiles and the extraction of phase signal corresponding to each equivalent receiving channel, the Maximum Ratio Combining (MRC) technique is used to fuse the phase signals from the multiple receiving channels. Then the Variational Mode Decomposition (VMD) is adopted to decompose the fused phase signal to reconstruct the life signal. Finally, the Fast Fourier Transform (FFT) is performed on the reconstructed the life signal to obtain the respiration rate and heartbeat rate. The experimental results show that the proposed life signal extraction method based on multichannel FMCW radar can extract the life signal more robustly and accurately compared to single channel FMCW radar. In addition, the combined MRC and VMD signal processing method outperforms the combined MRC and Band-Pass Filter (BPF) method.
- Multi-channel Frequency Modulated Continuous Wave (FMCW) radar /
- Maximum Ratio Combining (MRC) /
- Variational Mode Decomposition (VMD) /
- Life signal reconstruction

HTML全文

图 1 多通道FMCW雷达生命信号提取流程图

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图 2 实验场景

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图 3 距离剖面图

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图 4 多通道FMCW雷达相位信号

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图 5 多通道FMCW雷达相位信号VMD分解结果

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图 6 多通道FMCW雷达VMD重构的生命信号频谱

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图 7 多通道FMCW雷达相位融合信号BPF滤波后生命信号频谱

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图 8 呼吸和心跳频率RE比较曲线

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表 1 多通道FMCW雷达参数

	起始频率 ${f_{\text{c}}}$	带宽 $B$	Chirp波形持续时间 $T$	慢时间维采样周期 ${T_{\text{s}}}$	慢时间维采样数 $L$	快时间维采样数 $K$
参数值	24 GHz	2 GHz	1 ms	1 ms	10000	256

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表 2 重构结果SNR(dB)

重构结果SNR	测量通道	目标距离 (1 m)	目标距离 (2 m)
1号志愿者呼吸重构结果SNR	相位融合	36.87	36.76
	1通道	36.83	36.53
	2通道	36.88	36.62
	3通道	36.81	36.50
	4通道	36.83	36.53
1号志愿者心跳重构结果SNR	相位融合	36.06	35.88
	1通道	32.42	34.55
	2通道	32.14	32.78
	3通道	34.62	30.74
	4通道	32.42	34.26
2号志愿者呼吸重构结果SNR	相位融合	37.29	36.35
	1通道	37.24	35.26
	2通道	37.41	34.43
	3通道	37.24	34.28
	4通道	37.24	34.93
2号志愿者心跳重构结果SNR	相位融合	33.12	33.70
	1通道	32.61	30.99
	2通道	32.95	32.73
	3通道	32.42	31.69
	4通道	32.61	30.98

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