Line of Sight Procedure for Dijkstra-Algorithm Based Ray-Tracing

2017 ◽  
pp. 741-753
Author(s):  
Kazunori Uchida ◽  
Leonard Barolli
Keyword(s):  
Ray Tracing ◽  
Line Of Sight ◽  
Dijkstra Algorithm

scholarly journals Channel Impulse Response at 60 GHz and Impact of Electrical Parameters Properties on Ray Tracing Validations

Electronics ◽  
2021 ◽  
Vol 10 (4) ◽  
pp. 393
Author(s):  
Huthaifa Obeidat ◽  
Atta Ullah ◽  
Ali AlAbdullah ◽  
Waqas Manan ◽  
Omar Obeidat ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Ray Tracing ◽  
Impulse Response ◽  
Line Of Sight ◽  
Indoor Propagation ◽  
60 Ghz ◽  
Environment Design ◽  
Electrical Parameters ◽  
Concrete Walls ◽  
Properties Of Materials

This paper outlines a study of the effect of changing the electrical properties of materials when applied in the Wireless InSite (WI) ray-tracing software. The study was performed at 60 GHz in an indoor propagation environment and supported by Line of Sight (LoS) and Non-LoS measurements data. The study also investigates other factors that may affect the WI sensitivity, including antenna dimensions, antenna pattern, and accuracy of the environment design. In the experiment, single and double reflections from concrete walls and wooden doors are analysed. Experimental results were compared to those obtained from simulation using the WI. It was found that materials selected from the literature should be similar to those of the environment under study in order to have accurate results. WI was found to have an acceptable performance provided certain conditions are met.

scholarly journals Measurements and Ray Tracing Simulations for Non-Line-of-Sight Millimeter-Wave Channels in a Confined Corridor Environment

IEEE Access ◽  
2019 ◽  
Vol 7 ◽  
pp. 85066-85081 ◽  
Author(s):  
Guangrong Yue ◽  
Daizhong Yu ◽  
Hao Qiu ◽  
Ke Guan ◽  
Lin Yang ◽  
...  
Keyword(s):  
Ray Tracing ◽  
Millimeter Wave ◽  
Line Of Sight ◽  
Non Line Of Sight

Dijkstra algorithm-based ray tracing for tunnel-like structures

2020 ◽  
Vol 11 (1) ◽  
pp. 84
Author(s):  
Kazunori Uchida ◽  
Leonard Barolli
Keyword(s):  
Ray Tracing ◽  
Dijkstra Algorithm

Ray-tracing analysis of the radio propagation on the line-of-sight maritime wireless environments

2018 ◽  
Vol 8 (4) ◽  
pp. 196
Author(s):  
Yoshinori Matsuura ◽  
Kohei Shimada ◽  
Yasuhiro Sato ◽  
Masaaki Yamanaka ◽  
Daiki Hashimoto
Keyword(s):  
Ray Tracing ◽  
Radio Propagation ◽  
Line Of Sight ◽  
Wireless Environments

The Study of Diffraction Ray Tracing on the Surface of Airplane

2012 ◽  
Vol 433-440 ◽  
pp. 6345-6349
Author(s):  
Li Peng Deng ◽  
Xiao Ying Zhao ◽  
You Feng Chen ◽  
Wang Jing
Keyword(s):  
Ray Tracing ◽  
Shortest Path ◽  
Convex Surface ◽  
Local Algorithm ◽  
Dijkstra Algorithm ◽  
End Point

This article makes the surface of airplane into quadrilateral gridding by using the method of discrete gridding generation, and calculates the data of gridding by using the classical Dijkstra algorithm (local algorithm) which can seek the shortest path from the start point and the end point. With that we can achieve diffraction ray tracing. This method can be used for any convex surface of the diffraction ray tracing.

scholarly journals A Ray-Tracing Technique to Characterize GPS Multipath in the Frequency Domain

2015 ◽  
Vol 2015 ◽  
pp. 1-16 ◽  
Author(s):  
Naveen S. Gowdayyanadoddi ◽  
James T. Curran ◽  
Ali Broumandan ◽  
Gérard Lachapelle
Keyword(s):  
Frequency Domain ◽  
Ray Tracing ◽  
Multipath Propagation ◽  
Doppler Frequency ◽  
Real Data ◽  
Frequency Difference ◽  
Line Of Sight ◽  
Gps Measurements ◽  
Sources Of Error ◽  
Non Line Of Sight

Multipath propagation is one of the major sources of error in GPS measurements. In this research, a ray-tracing technique is proposed to study the frequency domain characteristics of multipath propagation. The Doppler frequency difference, also known as multipath phase rate and fading frequency, between direct (line-of-sight, LOS) and reflected (non-line-of-sight, NLOS) signals is studied as a function of satellite elevation and azimuth, as well as distance between the reflector and the static receiver. The accuracy of the method is verified with measured Doppler differences from real data collected in a downtown environment. The use of ray-tracing derived predicted Doppler differences in a receiver, as a means of alleviating the multipath induced errors in the measurement, is presented and discussed.

Improving Accuracy of Ray-Tracing Prediction in Non Line-of-Sight (NLOS) Urban Street Cell Environment beyond 6GHz

2017 ◽  
Vol E100.B (4) ◽  
pp. 566-574
Author(s):  
Nobutaka OMAKI ◽  
Tetsuro IMAI ◽  
Koshiro KITAO ◽  
Yukihiko OKUMURA
Keyword(s):  
Ray Tracing ◽  
Line Of Sight ◽  
Urban Street ◽  
Improving Accuracy ◽  
Non Line Of Sight

The appearance of the objects rolling at relativistic speeds

2008 ◽  
Vol 86 (12) ◽  
pp. 1437-1441 ◽  
Author(s):  
A Sfarti
Keyword(s):  
Ray Tracing ◽  
Three Dimensional ◽  
Line Of Sight ◽  
Rectilinear Motion ◽  
Complex Type ◽  
Computer Representation ◽  
Tracing Algorithm ◽  
Moving Bodies ◽  
Circular Outline ◽  
Relativistic Equations

In the late 1950s Terrell and Penrose produced a series of papers dealing with the appearance of the rapidly moving bodies while in rectilinear motion as photographed by a simple, pinhole camera. A few more articles on the same subject followed, for example, Penrose showed that a sphere is always seen having an exactly circular outline, at any velocity, at any distance and for any line of sight. In the present paper, we will deal with a more complex type of motion, the combination of translation and rotation that can be seen when observing the wheels of a vehicle passing by. Since Terrell and Penrose wrote their papers, great advances in the camera simulation via computer representation have been made. The field that deals with the simulation of realistic cameras via computers is called ray tracing. In the current paper, we will combine two different disciplines, relativistic physics and three-dimensional graphics to derive new results. Our paper is divided in two main parts, in the first half, we will derive the relativistic equations for rolling motion without slip and we will make some connections with the physical requirements of a relativistic ray-tracing algorithm. In the second half, we will review the foundations of classical ray-tracing algorithms and we will introduce the additional features for operation at relativistic speeds. We will demonstrate an interesting self-canceling effect of the relativistic Doppler shift on the colors wavelengths of the moving object.PACS No.: 03.30.+p

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