Time-resolved non-sequential ray-tracing modelling of non-line-of-sight picosecond pulse LIDAR

2016 ◽  
Author(s):  
Adam Sroka ◽  
Susan Chan ◽  
Ryan Warburton ◽  
Genevieve Gariepy ◽  
Robert Henderson ◽  
...  
Keyword(s):  
Ray Tracing ◽  
Picosecond Pulse ◽  
Line Of Sight ◽  
Time Resolved ◽  
Non Line Of Sight

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

scholarly journals A dataset for benchmarking time-resolved non-line-of-sight imaging

2019 ◽  
Author(s):  
Miguel Galindo ◽  
Julio Marco ◽  
Matthew O'Toole ◽  
Gordon Wetzstein ◽  
Diego Gutierrez ◽  
...  
Keyword(s):  
Line Of Sight ◽  
Time Resolved ◽  
Non Line Of Sight

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

scholarly journals Ultrafast light field tomography for snapshot transient and non-line-of-sight imaging

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Xiaohua Feng ◽  
Liang Gao
Keyword(s):  
Applied Sciences ◽  
Light Field ◽  
Moving Objects ◽  
Dimensional Space ◽  
Three Dimensional ◽  
Line Of Sight ◽  
Temporal Dimension ◽  
Time Resolved ◽  
Imaging Strategy ◽  
Non Line Of Sight

AbstractCameras with extreme speeds are enabling technologies in both fundamental and applied sciences. However, existing ultrafast cameras are incapable of coping with extended three-dimensional scenes and fall short for non-line-of-sight imaging, which requires a long sequence of time-resolved two-dimensional data. Current non-line-of-sight imagers, therefore, need to perform extensive scanning in the spatial and/or temporal dimension, restricting their use in imaging only static or slowly moving objects. To address these long-standing challenges, we present here ultrafast light field tomography (LIFT), a transient imaging strategy that offers a temporal sequence of over 1000 and enables highly efficient light field acquisition, allowing snapshot acquisition of the complete four-dimensional space and time. With LIFT, we demonstrated three-dimensional imaging of light in flight phenomena with a <10 picoseconds resolution and non-line-of-sight imaging at a 30 Hz video-rate. Furthermore, we showed how LIFT can benefit from deep learning for an improved and accelerated image formation. LIFT may facilitate broad adoption of time-resolved methods in various disciplines.

scholarly journals Dataset for Benchmarking Time-Resolved Non-Line-of-Sight Imaging

2019 ◽  
Vol 7 ◽  
Author(s):  
Miguel Jorge Galindo Ramos ◽  
Julio Marco Murria ◽  
Diego Gutiérrez Pérez ◽  
Adrián Jarabo Torrijos
Keyword(s):  
Real World ◽  
Line Of Sight ◽  
Time Resolved ◽  
Naturally Occurring ◽  
Reconstruction Methods ◽  
Real World Applications ◽  
Order Of Magnitude ◽  
Public Dataset ◽  
Time Resolved Imaging ◽  
Non Line Of Sight

Time-resolved imaging has made it possible to look around corners by exploiting information from indirect light bounces. While there have been successive improvements in the field since its conception, so far it has only been proven to work in very simple and controlled scenarios. We present a public dataset of synthetic time-resolved Non-Line-of-Sight (NLOS) scenes with varied complexity aimed at benchmarking reconstructions. It includes scenes that are common in the real world but remain a challenge for NLOS reconstruction methods due to the ambiguous nature of higher-order diffuse bounces naturally occurring in them. With over 300 reconstructible scenes, the dataset contains an order of magnitude more scenes than what is available currently. The final objective of the dataset it to boost NLOS research to take it closer to its real-world applications.

Integrating the Non-Line of Sight Launching System (NLOS-LS) in the United States Navy

2007 ◽  
Author(s):  
Jonathon Emis ◽  
Bryan Huang ◽  
Timothy Jones ◽  
Mei Li ◽  
Don Tumbocon
Keyword(s):  
United States ◽  
United States Navy ◽  
The United States ◽  
Line Of Sight ◽  
Non Line Of Sight

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.

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