tailieunhanh - Ultra Wideband Part 12

Tham khảo tài liệu 'ultra wideband part 12', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 324 Ultra Wideband based on Continuous Wavelet Transform. Pulse radar is considered. Besides ability to detect breathing through 20 cm- thick brick wall is demonstrated. In Narayanan 2008 noise radar is used for breathing detection. Breathing signature is separated from unwanted signal components by means of Hilbert-Huang transform. Finally breathing is clearly detected through 30 cm- thick concrete wall useful signal is 3 dB higher then highest noise peak In Levitas Matuzas 2006 and Levitas et al. 2008 two algorithms for breathing detection are proposed by group from Geozondas Inc. In Levitas Matuzas 2006 breathing is detected as a strong variation in the spectrum of received radar response. However this approach doesn t differentiate between breathing and any other motion in radar cross-section. Algorithm in Levitas et al. 2008 detects breathing as a periodical variation of some waveform. Neither in Levitas Matuzas 2006 nor in Levitas et al. 2008 this waveform is considered to be known a priori in contrast to Chernyak 2006 and Ossberger et al. 2004 . In Levitas et al. 2008 breathing was clearly detected through 16-cm thick brick wall by means of impulse radar. Importantly ability to detect two breathing persons simultaneously is demonstrated. Breathing rate of two persons was deliberately different but this difference is not the only distinction between two persons in received signal since it can be seen that two breathing signatures arrive at different distances to antennas. Historically UWB radars were extensively applied as Ground Penetrating Radars GPR in the fields of geophysics archaeology and for the detection of buried mines prior to using them for the problem described in this chapter. No surprise though that some investigations were carried out in order to determine the efficiency of GPRs for the detection of people buried beneath the rubble Thorough test of GPR as a detector of living person is described in Bechtel Special Technologies Laboratory .

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