超寬帶信號穿透塌方體衰減特性及生命特征檢測方法研究
[Abstract]:Coal plays an important role in the energy composition of China, and the safety of coal mine production is concerned. After the accident, how to understand the situation below the collapse as soon as possible is very important and urgent for the rescue work. UWB signal has strong penetration ability, anti-interference, high resolution and small detection blind area, so it is suitable for underground rescue detection. The rescue efficiency can be improved by using UWB signal to detect the life under collapse. Based on the collapse of coal mine roadway, the electromagnetic characteristics of collapse body are analyzed in this paper. The attenuation characteristics of UWB electromagnetic wave are analyzed theoretically. Based on the theory of plane electromagnetic wave and Fresnel formula, the transmission loss and reflection loss characteristics of ultra-broadband electromagnetic wave in rock, concrete and complex collapse medium are analyzed. The numerical simulation results show that the larger the incident angle is, the greater the loss is; the loss of UWB electromagnetic wave increases with the increase of frequency; the transmission loss of parallel polarization wave decreases at first and then increases because of the increase of incident angle; the attenuation effect of collapse medium with large dielectric constant on UWB signal is dominated by reflection loss. On the basis of the above work, the life feature detection algorithm under collapse based on UWB signal is studied. The clutter of UWB signal in mine fluctuates greatly, so the hybrid algorithm of empirical mode decomposition (EMD) and reference independent component analysis (R-ICA) is used. The hash component is filtered by R-ICA method, the echo signal is decomposed into several components by EMD algorithm, and the life characteristic curve is analyzed in time domain, and the respiratory and heartbeat signals are extracted under the condition of high signal-to-interference ratio. The simulation results show that the algorithm can reconstruct the waveform information of breathing and heartbeat of the target life body, and can be used for contactless life detection under collapse.
【學位授予單位】:黑龍江科技大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TN925
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