南京大学学报(自然科学版) ›› 2022, Vol. 58 ›› Issue (4): 680688.doi: 10.13232/j.cnki.jnju.2022.04.012
• • 上一篇
摘要:
变分模态分解方法常被用于生命体征信号检测,针对该方法模态个数确定存在主观性的问题,提出一种改进变分模态分解方法进行非接触式测量生命体征信号.利用毫米波雷达获得生命体征回波信号,经过降噪、目标距离单元定位等处理获得生命体征信号.生命体征信号成分主要包括心跳与呼吸信号.其中心跳信号能量小,受呼吸信号影响大,本方法利用余量与模态分量重构信号的自相关系数确定最优分解模态数量,避免了模态数量的过分解和欠分解,达到自适应分离生命体征信号的目的.实验结果表明,与变分模态分解方法相比,该方法可自适应确定模态分解个数.
中图分类号:
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