tailieunhanh - Báo cáo hóa học: " Research Article A New Method for Identifying the Life Parameters via Radar"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article A New Method for Identifying the Life Parameters via Radar | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2007 Article ID31415 8 pages doi 2007 31415 Research Article A New Method for Identifying the Life Parameters via Radar Wang Jianqi 1 2 Zheng Chongxun 1 Lu Guohua 2 and Jing Xijing2 1 The Key Laboratory of Education Ministry of China Xi an Jiaotong University Xi an 710049 China 2 Department of Biomedical Engineering The Fourth Military Medical University Xi an 710032 China Received 10 January 2006 Revised 22 September 2006 Accepted 6 October 2006 Recommended by Ulrich Heute It has been proved that the vital signs can be detected via radar. To better identify the life parameters such as respiration and heartbeat a novel method combined with several signal processing techniques is presented. Firstly to improve the signal-to-noise ratio SNR of the life signals the signal accumulation technique by FFT is used. Then to restrain the interferences produced by moving objects a dual filtering algorithm DFA which is able to remove the interferences by tracing the interfering spectral peaks is proposed. Finally the wavelet transform is applied to separate the heartbeat from the respiration signal. The method cannot only help to automatically detect the existence of human beings effectively but also identifying the parameters like respiration heartbeat and body-moving signals significantly. Experimental results demonstrated that the method is very promising in identifying the life parameters via radar. Copyright 2007 Wang Jianqi et al. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. INTRODUCTION The life-detection system can be used to search living objects after the earthquake and building collapse also to monitor patients in clinic without contacting the subjects. In addition it can be used by law-enforcement services