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To improve the life detection accuracy of UWB bi-radar in ruin scene, the paper put forward a layering detection approach based on segmented time window to achieve the goal. Firstly, a bio-radar hardware which can accomplish the layering detection function was implemented. Besides that, to eliminate the influence of individual difference, a frequency and displacement quantitatively adjustable system...
Recently the increasing anti-terrorism and disaster rescue operations underscore the requirement for effective detection and recognition of finer-grained human activity. Currently, the most effective technology is usually realized by exploiting time-frequency analysis to extract the micro-Doppler (MD) signature difference formed by different parts of the body movement. However, for inherently nonlinear...
Millimeter wave radar provides a promising alternative for conducting human speech. However, the 94 GHz radar speech signal are easy to be polluted by sources of noise which mainly include electromagnetic and channel noise. Thus, the quality of the radar speech was found to be unsatisfactory. In order to improve the quality of the radar speech, a signal subspace algorithm was used to remove the noise...
Due to the complexity of ruin scenes in the post-disaster search and rescue operations, the UWB echo signal reflected from the human target is often contaminated by the clutters and noises from the surrounding environment, which makes it difficult to extract the chest-wall micro-motion information that indicating the presence of human target, causing misjudgment and leakage. Thus, it remains as a...
Ultrawideband synthetic aperture radar (SAR) (UWB SAR) is a sufficient approach to detecting land mines over large areas from a safe standoff distance. UWB SAR detection involves three steps: imaging, prescreening, and discrimination. Many studies have concentrated on imaging and discrimination, whereas few have highlighted prescreening. We propose a novel prescreening method for extracting the region...
It is efficient to enlarge the radar bandwidth based on multi-band fusion. However, the former research on multi-band fusion did not take velocity into consideration. When the velocity is very high or pulse width is long, ignoring the impact of high speed the range resolution will deteriorate heavily. In this paper the authors develop a new method of forming high resolution range profile of fast moving...
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