| 摘要: |
| 针对同一距离多人生命体征检测和呼吸高次谐波干扰下心跳信号提取的问题，提出了一种基于数字波束合成和正交投影滤波器(Orthogonal Projection Filter,OPF的算法。雷达测得多路基带信号后，首先进行数字波束合成，通过在空间上生成多个指向受试者的波束，得到多人的生命体征信号；接着利用OPF将获得的生命体征信号投影到各自呼吸高次谐波的零空间上，实现呼吸高次谐波干扰去除、心跳信号的实时获取。多人实验结果表明，所提算法能够成功分离多人的生命体征信号检测和心跳信号提取，心跳频率估计的准确率高达99.68%。 |
| 关键词: 多人生命体征检测 呼吸高次谐波 心跳信号提取 数字波束合成 正交投影滤波器 |
| DOI：10.20079/j.issn.1001-893x.240314003 |
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| 基金项目:国家自然科学基金青年科学基金项目（62201259 |
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| A Novel Method for Multi-person Respiratory and Heartbeat Signals Extraction |
| SI Jun,LIU Yingpan,XIONG Junjun,BAI Lei,WU Jian,DING Chuangwei |
| (1.The 723rd Institute of China State Shipbuilding Corporation Limited,Yangzhou 225101,China;2.School of Electronic and Optical Engineering Nanjing University of Science and Technology,Nanjing 210094,China) |
| Abstract: |
| For the problems of multi-person vital sign detection at the same distance and extraction of heartbeat signals under the interference of respiratory higher harmonics,an algorithm based on digital beamforming and orthogonal projection filter(OPF is proposed.After the radar measures multiple baseband signals,digital beamforming is first performed to obtain the vital sign signals of people by generating multiple beams pointing to the subjects in space.Then,using the OPF,the obtained vital sign signals are projected onto the null space of their respective respiratory higher harmonics to achieve the removal of respiratory higher harmonic interference and the real-time acquisition of heartbeat signals.The results of multi-person experiments show that the proposed algorithm can successfully separate the detection of multi-person vital sign signals and the extraction of heartbeat signals,and the accuracy rate of heartbeat frequency estimation is as high as 99.68%. |
| Key words: multi-person vital signs detection respiration harmonic heartbeat signal extraction digital beamforming orthogonal projection filter |
