scholarly journals IR-UWB Pulse Generation Using FPGA Scheme for through Obstacle Human Detection

Sensors ◽  
2020 ◽  
Vol 20 (13) ◽  
pp. 3750 ◽  
Author(s):  
Lalida Tantiparimongkol ◽  
Pattarapong Phasukkit
Keyword(s):  
Human Subjects ◽  
Obstacle Detection ◽  
Radar System ◽  
Pulse Generation ◽  
Human Detection ◽  
Ultra Wideband ◽  
Range Estimation ◽  
Clay Bricks ◽  
Uwb Radar ◽  
Wide Range

This research proposes a scheme of field programmable gate array (FPGA) to generate an impulse-radio ultra-wideband (IR-UWB) pulse. The FPGA scheme consists of three parts: digital clock manager, four-delay-paths stratagem, and edge combiner. The IR-UWB radar system is designed to detect human subjects from their respiration underneath the rubble in the aftermath of an earthquake and to locate the human subjects based on range estimation. The proposed IR-UWB radar system is experimented with human subjects lying underneath layers of stacked clay bricks in supine and prone position. The results reveal that the IR-UWB radar system achieves a pulse duration of 540 ps with a bandwidth of 2.073 GHz (fractional bandwidth of 1.797). In addition, the IR-UWB technology can detect human subjects underneath the rubble from respiration and identify the location of human subjects by range estimation. The novelty of this research lies in the use of the FPGA scheme to achieve an IR-UWB pulse with a 2.073 GHz (117 MHz–2.19 GHz) bandwidth, thereby rendering the technology suitable for a wide range of applications, in addition to through-obstacle detection.

scholarly journals A Multiple Target Positioning and Tracking System Behind Brick-Concrete Walls Using Multiple Monostatic IR-UWB Radars

Sensors ◽  
2019 ◽  
Vol 19 (18) ◽  
pp. 4033 ◽  
Author(s):  
Yoo ◽  
Wang ◽  
Seol ◽  
Lee ◽  
Chung ◽  
...  
Keyword(s):  
False Alarm ◽  
False Alarm Rate ◽  
Detection Rate ◽  
Tracking System ◽  
Radar System ◽  
Ultra Wideband ◽  
Radar Signal ◽  
High Detection Rate ◽  
Concrete Walls ◽  
Uwb Radar

Recognizing and tracking the targets located behind walls through impulse radio ultra-wideband (IR-UWB) radar provides a significant advantage, as the characteristics of the IR-UWB radar signal enable it to penetrate obstacles. In this study, we design a through-wall radar system to estimate and track multiple targets behind a wall. The radar signal received through the wall experiences distortion, such as attenuation and delay, and the characteristics of the wall are estimated to compensate the distance error. In addition, unlike general cases, it is difficult to maintain a high detection rate and low false alarm rate in this through-wall radar application due to the attenuation and distortion caused by the wall. In particular, the generally used delay-and-sum algorithm is significantly affected by the motion of targets and distortion caused by the wall, rendering it difficult to obtain a good performance. Thus, we propose a novel method, which calculates the likelihood that a target exists in a certain location through a detection process. Unlike the delay-and-sum algorithm, this method does not use the radar signal directly. Simulations and experiments are conducted in different cases to show the validity of our through-wall radar system. The results obtained by using the proposed algorithm as well as delay-and-sum and trilateration are compared in terms of the detection rate, false alarm rate, and positioning error.

scholarly journals Multi-Human Detection Algorithm Based on an Impulse Radio Ultra-Wideband Radar System

IEEE Access ◽  
2016 ◽  
Vol 4 ◽  
pp. 10300-10309 ◽  
Author(s):  
Jeong Woo Choi ◽  
Sung Sik Nam ◽  
Sung Ho Cho
Keyword(s):  
Detection Algorithm ◽  
Impulse Radio ◽  
Radar System ◽  
Human Detection ◽  
Ultra Wideband ◽  
Wideband Radar

A UWB Through-Wall-Detection Radar System Based on Android Devices

2013 ◽  
Vol 333-335 ◽  
pp. 1518-1522
Author(s):  
Dan Tian ◽  
Yong Wang
Keyword(s):  
Mobile Devices ◽  
Low Cost ◽  
Radar System ◽  
Human Detection ◽  
Experimental Results ◽  
Ultra Wideband ◽  
The Cost

The ultra-wideband through-wall detection radar (UWB-TWDR) system is burgeoning and considered as one of the promising systems for rescue and military use. In this paper, the mechanism and structure of a simple and low-cost UWB-TWDR system are presented. Compared with previous systems, android based mobile devices were used to replace the traditional PC, making the system more portable and affordable for most users. In addition, correlation detectors were applied to simplify the circuit and further reduce the cost. The algorithm for locating and tracking during the process of acquiring and handling data from antennas was also discussed. Experimental results of our system showed a good performance in practical through-wall human detection.

Krypton 85 myocardial blood flow: precordial scintillation versus coronary sinus sampling

1965 ◽  
Vol 209 (4) ◽  
pp. 705-710 ◽  
Author(s):  
Michael D. Klein ◽  
Lawrence S. Cohen ◽  
Richard Gorlin
Keyword(s):  
Blood Flow ◽  
Myocardial Blood Flow ◽  
Coronary Sinus ◽  
Human Subjects ◽  
Radioactive Decay ◽  
Empirical Correction ◽  
Wide Range ◽  
Actual Flow ◽  
Flow Through ◽  
High Degree

Myocardial blood flow in human subjects was assessed by comparative simultaneous measurement of krypton 85 radioactive decay from coronary sinus and precordial scintillation. Empirical correction of postclearance background from precordial curves yielded a high degree of correlation between flows derived from the two sampling sites (r = .889, P < .001). Comparison of left and right coronary flows in nine subjects revealed similarity in flow through the two vessels over a wide range of actual flow values (r = .945, P < .001).

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