基于虚拟仪器技术的生命特征识别方法的研究  

Study on life feature recognition method based on virtual instrument

作　　者：庹立权[1] 覃武[1] 王凤歌[2] 缪灵[1] 

机构地区：[1]华中科技大学电子科学与技术系智能电子学研究所,武汉430074 [2]西北机电工程研究所,咸阳712099

出　　处：《电子测量技术》2011年第12期84-87,共4页Electronic Measurement Technology

摘　　要：针对目前虚拟仪器技术实现生命探测的反应时间长、灵敏度不高等问题,提出利用平均功率比的变化来识别生命体的方法。基于多普勒频移理论提取出生命特征频率下的微动信号,按照生命特征的不同频段计算提取信号的平均功率,以不同频段平均功率比值的变化来表征生命体的有无。利用虚拟仪器技术及LABVIEW图形化编程软件进行了模拟分析及实测分析,两者分析结果一致,证实用功率比值变化来表征生命体有无的可行性。此方法可以减小外界干扰信号以及滤波不完全的影响,提高了生命信号判断的准确率。As the problems of slow speed and Low sensitivity existed in life detector recognition system implemented by using virtual instruments,a new method of recognition life using the change of power ratio is proposed.Micro-signal that contains certain life characteristic frequency is extracted based on the theory of Doppler frequency shift.Then average power of the extracted signal is calculated by different frequency domain of life characteristic.Average power ratio in different frequency domain is utilized to represent the existence of life.Simulation and experimental analysis are finished by using virtual instruments and LABVIEW.The experimental results are consistent with the simulation.The results show that this method is feasible and can reduce influence from the external interference signal and incomplete filtering noise.The accuracy of life detection is greatly improved.

关 键 词：生命探测 虚拟仪器技术 多普勒频移 

分 类 号：TN911.7[电子电信—通信与信息系统]