摘要
目的 :提高非接触生命参数检测系统信噪比 .方法 :采用两种基于FFT的频域积累检测方法 ,利用Matlab软件环境编写算法 ,进行仿真实验与实际信号处理 .结果 :该方法提高了非接触检测系统信号的信噪比 ,能够在强噪声背景下检测出生命参数信号 .结论 :该方法适用于低信噪比下的微弱信号提取 。
AIM: To improve signal-to-noise-ratio (SNR) of n on-contact life-parameters signal detecting system.METHODS: W ith the software of Matlab,the method of frequency domain signal integration ba sed on FFT was used to make simulation and real signal processing.RESUL TS: The SNR was improved with this method.The expectant signal could be detected even in strong noise environment. CONCLUSION: The method can be used to obtain weak signals with low SNR and has been well applie d in non-contact life-parameters detecting system.
出处
《第四军医大学学报》
北大核心
2003年第2期172-175,共4页
Journal of the Fourth Military Medical University
基金
国家自然科学基金资助项目 (60 1 71 0 2 1 )
关键词
FFT
频域积累
非接触生命参数
信号检测
frequency domain signal integration
signa l-to-noise-ratio (SNR)
FFT
signal processing,computer-assisted
