Ray-tracing model calibration for underground mines propagation prediction at high UHF frequencies

2010 ◽  
Author(s):  
M M Moutairou ◽  
G Y Delisle ◽  
D Grenier
Keyword(s):  
Ray Tracing ◽  
Model Calibration ◽  
Underground Mines ◽  
Propagation Prediction ◽  
Ray Tracing Model

INTERCOMPARATIVE STUDY OF LONG-YEAR WAVE HINDCASTING DATA SAMPLES BY USE OF BACKWARD RAY TRACING MODEL AND SWAN MODEL UNDER MSM-BASED WINDS CONDITION PROVIDED BY JMA

2018 ◽  
Vol 74 (4) ◽  
pp. I_457-I_462
Author(s):  
Masataka YAMAGUCHI ◽  
Hirokazu NONAKA ◽  
Yoshio HATADA ◽  
Yoshihiro UTSUNOMIYA ◽  
Kunimitsu INOUCHI ◽  
...  
Keyword(s):  
Ray Tracing ◽  
Swan Model ◽  
Wave Hindcasting ◽  
Ray Tracing Model

Evaluation of Empirical Ray-Tracing Model for an Urban Outdoor Scenario at 73 GHz E-Band

2014 ◽  
Author(s):  
Huan Cong Nguyen ◽  
George R. MacCartney ◽  
Timothy Thomas ◽  
Theodore S. Rappaport ◽  
Benny Vejlgaard ◽  
...  
Keyword(s):  
Ray Tracing ◽  
Ray Tracing Model

scholarly journals Bidimensional Ray Tracing Model for the Underwater Noise Propagation Prediction

Fluids ◽  
2021 ◽  
Vol 6 (1) ◽  
pp. 19
Author(s):  
Emmanuele D’Andrea ◽  
Maurizio Arena ◽  
Massimo Viscardi ◽  
Tommaso Coppola
Keyword(s):  
Ray Tracing ◽  
Research Collaboration ◽  
Transmission Loss ◽  
International Treaties ◽  
Underwater Noise ◽  
Noise Propagation ◽  
Simulation Code ◽  
Emission Limits ◽  
Propagation Prediction ◽  
Marine Wildlife

An increasing attention has recently been paid to the effect of the underwater noise field generated by ship activities on the marine environment. Although this problem is widely discussed in international treaties and conventions, it has not yet found a consolidated technical-scientific treatment capable of quantifying the level of underwater noise emissions produced by naval systems. As part of a national research collaboration, a novel code has been developed to predict noise propagation according to the Ray Tracing approach. Such optical geometry-based technique allows for calculating the Transmission Loss (TL) trend in its respective contributions: geometrical loss (due to the distance between the source and receiver), dissipation loss (due to the characteristics of the propagation environment), and reflection loss (due to the surfaces that delimit the field). The simulation requires as input parameters the source info as spatial position, frequency, and sound pressure level (SPL) as well as the sea properties like seabed depth, the speed of sound profile, the layers thickness the water column is divided into, the sea salinity, temperature, and pH. The simulation code provides the SPL spatial distribution useful as a fast industrial tool in the future studies addressed to identify the emission limits for the protection of marine wildlife.

Generalized Ray-tracing Model for Modified Geodesic Luneburg Lens Antennas

2021 ◽  
Author(s):  
Qingbi Liao ◽  
Francisco Mesa ◽  
Oskar Zetterstrom ◽  
Nelson J. G. Fonseca ◽  
Oscar Quevedo-Teruel
Keyword(s):  
Ray Tracing ◽  
Lens Antennas ◽  
Luneburg Lens ◽  
Ray Tracing Model
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