Abstract
Abstract A novel technique for single-channel ultra-wideband (UWB) radar to detect and identify two stationary human subjects in different positions is proposed in this article. To detect two stationary human targets accurately and get their life parameters precisely, space–frequency analysis is performed upon the preprocessed data in horizontal dimension and then a non-linear threshold is calculated for automatic identification. Experiments are conducted to evaluate the effectiveness of the proposed technique. In 61 data sets with two stationary human subjects, the accuracy of identification reaches 72%. The experimental results demonstrate the validity of our approach to detect and identify two stationary human subjects using single-channel UWB radar system. This technique may serve as a basis for further studies on a two-dimensional locator for multi-stationary human subjects via multi-channel UWB radar.
Highlights
Life-detection radar is a novel kind of radar that combines the technology of radar and biomedical engineering
A new UWB radar operating at a center frequency of 400 MHz is developed to improve the detection capability through nonmetallic substances, and a method combined several signal processing techniques for two stationary human targets detection is proposed
True is that the number and each distance of the human subjects are all correct, Missing is that the result shows no-subject while there is a human target in the detection area, False is that the result of the identification shows a subject while in a no-subject situation, and Error is that the distance of the human subject is wrong
Summary
Life-detection radar is a novel kind of radar that combines the technology of radar and biomedical engineering It can detect vital signals (such as respiration, heartbeat, jiggle, etc.) within a certain distance through nonmetallic substances (such as brick walls, rubble, etc.) without using electrodes, and is considered a powerful tool for a variety of civilian, law enforcement, and military applications. The application of CW radar was limited because the reflected wave could not provide range and azimuth information To obtain this essential information, In this article, a new UWB radar operating at a center frequency of 400 MHz is developed to improve the detection capability through nonmetallic substances, and a method combined several signal processing techniques for two stationary human targets detection is proposed.
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