Model of human breathing reflected signal received by PN-UWB radar

2014 ◽  
Author(s):  
Mohamed Mabrouk ◽  
Sreeraman Rajan ◽  
Miodrag Bolic ◽  
Izmail Batkin ◽  
Hilmi R. Dajani ◽  
...  
Keyword(s):  
Uwb Radar ◽  
Reflected Signal

scholarly journals Through-Wall UWB Radar Based on Sparse Deconvolution with Arctangent Regularization for Locating Human Subjects

Sensors ◽  
2021 ◽  
Vol 21 (7) ◽  
pp. 2488
Author(s):  
Artit Rittiplang ◽  
Pattarapong Phasukkit
Keyword(s):  
Time Series ◽  
Human Subjects ◽  
Convolution Product ◽  
Iterative Technique ◽  
Concrete Wall ◽  
Uwb Radar ◽  
Deconvolution Problem ◽  
Reflected Signal ◽  
Reliable Solution ◽  
Human Position

A common problem in through-wall radar is reflected signals much attenuated by wall and environmental noise. The reflected signal is a convolution product of a wavelet and an unknown object time series. This paper aims to extract the object time series from a noisy receiving signal of through-wall ultrawideband (UWB) radar by sparse deconvolution based on arctangent regularization. Arctangent regularization is one of the suitably nonconvex regularizations that can provide a reliable solution and more accuracy, compared with convex regularizations. An iterative technique for this deconvolution problem is derived by the majorization–minimization (MM) approach so that the problem can be solved efficiently. In the various experiments, sparse deconvolution with the arctangent regularization can identify human positions from the noisy received signals of through- wall UWB radar. Although the proposed method is an odd concept, the interest of this paper is in applying sparse deconvolution, based on arctangent regularization with an S-band UWB radar, to provide a more accurate detection of a human position behind a concrete wall.

Detection of delamination in composites by using electromagnetic penetrating radar

2014 ◽  
Vol 5 (2) ◽  
pp. 151-156
Author(s):  
Z. Mechbal ◽  
A. Khamlichi
Keyword(s):  
Electromagnetic Wave ◽  
Electromagnetic Waves ◽  
Electromagnetic Wave Propagation ◽  
Wave Reflection ◽  
Image Features ◽  
Partial Reflection ◽  
Straight Path ◽  
Reflected Signal ◽  
Short Time ◽  
Intervening Factors

Composites made from E-glass/epoxy or aramid/epoxy are frequently used in aircraft and aerospace industries. These materials are prone to suffer from the presence of delamination, which can reduce severely the performance of aircrafts and even threaten their safety. Since electric conductivity of these composites is rather small, they can propagate electromagnetic waves. Detection of delamination damage can then be monitored by using an electromagnetic penetrating radar scanner, which consists of emitting waves having the form of short time pulses that are centered on a given work frequency. While propagating, these waves undergo partial reflection when running into an obstacle or a material discontinuity. Habitually, the radar is moved at constant speed along a straight path and the reflected signal is processed as a radargram that gives the reflected energy as function of the two-way time and the antenna position.In this work, modeling of electromagnetic wave propagation in composites made from E-glass/epoxy was performed analytically. The electromagnetic wave reflection from a delamination defect was analyzed as function of key intervening factors which include the defect extent and depth, as well as the work frequency. Various simulations were performed and the obtained results have enabled to correlate the reflection pattern image features to the actual delamination defect characteristics which can provide quantification of delamination.

Accurate Imaging Method for Moving Target with Arbitrary Shape for Multi-Static UWB Radar

2013 ◽  
Vol E96.B (7) ◽  
pp. 2014-2023 ◽  
Author(s):  
Ryo YAMAGUCHI ◽  
Shouhei KIDERA ◽  
Tetsuo KIRIMOTO
Keyword(s):  
Arbitrary Shape ◽  
Imaging Method ◽  
Moving Target ◽  
Uwb Radar ◽  
Accurate Imaging

Non-orthogonal Sidelobes Reduction for Virtual Aperture UWB Radar

2013 ◽  
Vol 34 (12) ◽  
pp. 2934-2941 ◽  
Author(s):  
Zhi Li ◽  
Tian Jin ◽  
Zhi-min Zhou
Keyword(s):  
Uwb Radar

An Adaptive-MSSA-Based Algorithm for Detection of Trapped Victims Using UWB Radar

2015 ◽  
Vol 12 (9) ◽  
pp. 1808-1812 ◽  
Author(s):  
Hao Lv ◽  
Teng Jiao ◽  
Yang Zhang ◽  
Qiang An ◽  
Miao Liu ◽  
...  
Keyword(s):  
Uwb Radar

Gait Speed Tracking System Using UWB Radar

2018 ◽  
Author(s):  
B. Lau ◽  
S. Haider ◽  
A. Boroomand ◽  
G. Shaker ◽  
J. Boger ◽  
...  
Keyword(s):  
Gait Speed ◽  
Tracking System ◽  
Speed Tracking ◽  
Uwb Radar
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