Ray-tracing based modeling of ultra-wideband pulse propagation in railway tunnels

2011 ◽  
Author(s):  
N. Sood ◽  
Liang Liang ◽  
S. V. Hum ◽  
C. D. Sarris
Keyword(s):  
Ray Tracing ◽  
Pulse Propagation ◽  
Ultra Wideband

FREQUENCY RESPONSE OF UWB SIGNAL IN A BEATING HEART

2020 ◽  
pp. 2050041
Author(s):  
Kedar Nath Sahu ◽  
Challa Dhanunjaya Naidu ◽  
Ravindharan Ethiraj ◽  
Jaya Sankar Kottareddygari
Keyword(s):  
Transmission Coefficient ◽  
Pulse Propagation ◽  
Continuous Wave ◽  
Power Transmission ◽  
Cardiac Activity ◽  
Ultra Wideband ◽  
Human Beings ◽  
Rescue Operation ◽  
Modeling And Analysis ◽  
Measurement Monitoring

The measurement, monitoring of heartbeat and its rate are necessary to know the health of the heart of human beings. In addition, they are needed for extended applications like criminal investigation, law enforcement, defense and military usage, search, rescue operation, etc. The ultra-wideband (UWB) radars found growing interest in recent years as they are able to overcome the limitations of continuous-wave (CW) Doppler radars in detecting human heartbeat. Modeling and analysis of the UWB pulse propagation behavior through a human body is important before developing a practical UWB radar. Several researchers have estimated the reflected signals to study if their variations correlate with the heartbeat rate. However, the reflected signal strength carrying Doppler information received at the radar after a two-way propagation of the RF signal was found to be too weak for detection. This paper presents (i) a model for UWB wave propagation through a human thorax and (ii) estimation via simulation, of transmission coefficient at various frequencies in the UWB range 1–10[Formula: see text]GHz using CST Microwave Studio. The study clearly indicates that the variation of power transmission coefficient of UWB signal has a strong correlation to the instantaneous dimension of the heart in a cardiac cycle, a feature that can be exploited in detecting cardiac activity of human being using radar-based principles.

An Accelerated Frequency Domain Ray-tracing Simulator for Ultra-Wideband Communications

PIERS Online ◽  
2009 ◽  
Vol 5 (3) ◽  
pp. 226-230
Author(s):  
John Diskin ◽  
Akram Alomainy ◽  
Conor Brennan
Keyword(s):  
Frequency Domain ◽  
Ray Tracing ◽  
Ultra Wideband ◽  
Wideband Communications

A Hybrid Deterministic-Stochastic Propagation Model for Short-Range MIMO-UWB Communication Systems

Frequenz ◽  
2012 ◽  
Vol 66 (7-8) ◽  
Author(s):  
Malgorzata Janson ◽  
Juan Pontes ◽  
Thomas Fügen ◽  
Thomas Zwick
Keyword(s):  
Ray Tracing ◽  
Communication Systems ◽  
Short Range ◽  
Direction Selectivity ◽  
Propagation Model ◽  
Ultra Wideband ◽  
Frequency Range ◽  
Channel Characteristics ◽  
Proposed Model ◽  
Ray Tracing Model

AbstractThis paper presents a computationally effective approach for including dense multipath components in ray tracing simulations of ultra wideband (UWB) channels. Through a combination of a standard ray tracing model with a simple geometric-stochastic model realistic scenario-specific simulations are possible. The frequency and direction selectivity of the channel are reproduced accurately by the model. The structure and parameters of the stochastic part of the model are derived from measurements in the FCC-UWB frequency range. Compared to conventional ray tracing simulations the proposed model reduces considerably the differences between simulated and measured channel characteristics.

scholarly journals Efficient Time-Domain Ray-Tracing Technique for the Analysis of Ultra-Wideband Indoor Environments including Lossy Materials and Multiple Effects

2009 ◽  
Vol 2009 ◽  
pp. 1-8 ◽  
Author(s):  
F. Saez de Adana ◽  
O. Gutiérrez ◽  
M. A. Navarro ◽  
A. S. Mohan
Keyword(s):  
Ray Tracing ◽  
Mobile Communications ◽  
Time Domain ◽  
Ultra Wideband ◽  
Indoor Environments ◽  
Acceleration Technique ◽  
Uniform Theory Of Diffraction ◽  
The Time Domain ◽  
The University ◽  
Lossy Materials

This paper presents an efficient application of the Time-Domain Uniform Theory of Diffraction (TD-UTD) for the analysis of Ultra-Wideband (UWB) mobile communications for indoor environments. The classical TD-UTD formulation is modified to include the contribution of lossy materials and multiple-ray interactions with the environment. The electromagnetic analysis is combined with a ray-tracing acceleration technique to treat realistic and complex environments. The validity of this method is tested with measurements performed inside the Polytechnic building of the University of Alcala and shows good performance of the model for the analysis of UWB propagation.

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