Terahertz Radar Signal for Heart and Breath Rate Detection Based on Time-Frequency Analysis
The method of human heartbeat and breath detection in terahertz band is studied in this chapter which uses frequency information extraction with twice T-F (time-frequency) analysis towards echo signal. Firstly, the echo model of human target is built and accurate speed information, containing the micro features of human target,is got by the combination of WVD (Wigner-Ville distribution) T-F analysis and centroid curve. Then, frequency of heartbeat and breath is extracted accurately by the second T-F analysis. According to the comparative analysis, SPWVD (smoothed pseudo Wigner-Ville distribution) based on the windowed WVD can effectively reduce the disturbance of cross-terms which can favor the detection of heartbeat and breath.
KeywordsTerahertz Heartbeat Breath Centroid SPWVD
This work is supported by the Fundamental Research Funds for the Central Universities under Project ZYGX2011J020.
- 2.Wiltse JC (1984) History of millimeter and submillimeter waves. IEEE Trans Microw Theory Tech MTT-32:1118–1127Google Scholar
- 4.Michahelles F, Wicki R Schiele B (2004) Less contact: heart-rate detection without even touching the user. In: Proceedings of the eighth international symposium on wearable computers, ArlingtonGoogle Scholar
- 6.Greneker EF (1997) Radar sensing of heartbeat and respiration at a distance. Radar 97:150–154Google Scholar
- 10.Peltonen V, Tuomi J, Klapure A, Huopaniemi J, Sorsa T (2002) Computational auditory scene recognition. In: Proceedings of the IEEE international conference on acoustics, speech, and signal processing, vol 2. pp 1941–1944Google Scholar