scholarly journals Analysis of transmission characteristics of non-line-of-sight ultraviolet light under complex channel conditions

2021 ◽  
Vol 336 ◽  
pp. 01012
Author(s):  
Xuan Zheng ◽  
Yanfeng Tang ◽  
Jingyi Du
Keyword(s):  
Ultraviolet Light ◽  
Path Loss ◽  
Mie Scattering ◽  
Spherical Particles ◽  
Dust Particles ◽  
Line Of Sight ◽  
Communication Link ◽  
Communication Quality ◽  
Long Distance ◽  
Non Line Of Sight

Using the multiple scattering model of non-line-of-sight ultraviolet light to simulate and analyze the atmospheric channel characteristics in the complex environment of haze and dust. The Mie scattering theory and T matrix method are used to analyze the path loss of spherical particles and non-spherical particles with particle concentration at different communication distances. The results show that when the communication distance is less than 50 meters, the communication quality under severe haze is the best, and for long-distance communication, the path loss under severe haze increases almost proportionally. In the non-line-of-sight ultraviolet light communication link, the higher the concentration of dust particles, the better the communication quality of the non-line-of-sight ultraviolet light communication transmission. Analysis of the scattering coefficient of spherical particles is significantly greater than that of non-spherical particles.

Single-scatter path loss model of LED-based non-line-of-sight ultraviolet communications

2021 ◽  
Author(s):  
Tian Cao ◽  
Xinyu Gao ◽  
Tianfeng Wu ◽  
Changyong Pan ◽  
Jian Song
Keyword(s):  
Path Loss ◽  
Line Of Sight ◽  
Loss Model ◽  
Path Loss Model ◽  
Single Scatter ◽  
Non Line Of Sight

Model Calculations of the F-Corona and inner Zodiacal Light

2020 ◽  
Author(s):  
Saliha Eren ◽  
Ingrid Mann
Keyword(s):  
Size Distribution ◽  
White Light ◽  
Scattered Light ◽  
Mie Scattering ◽  
Dust Particles ◽  
Line Of Sight ◽  
The Sun ◽  
Zodiacal Light ◽  
Model Calculations ◽  
Zodiacal Dust

<p>The white-light Fraunhofer corona (F-corona) and inner Zodiacal light are generated by interplanetary (Zodiacal) dust particles that are located between Sun and observer. At visible wavelength the brightness comes from sunlight scattered at the dust particles. F-corona and inner Zodiacal light were recently observed from STEREO (Stenborg et al. 2018) and Parker Solar Probe (Howard et al. 2019) spacecraft which motivates our model calculations. We investigate the brightness by integration of scattered light along the line of sight of observations. We include a three-dimensional distribution of the Zodiacal dust that describes well the brightness of the Zodiacal light at larger elongations, a dust size distribution derived from observations at 1AU and assume Mie scattering at silicate particles to describe the scattered light over a large size distribution from 1 nm to 100 µm. From our simulations, we calculate the flattening index of the F-corona, which is the ratio of the minor axis to the major axis found for isophotes at different distances from the Sun, respectively elongations of the line of sight. Our results agree well with results from STEREO/SECCHI observational data where the flattening index varies from 0.45° and 0.65° at elongations between 5° and 24°. To compare with Parker Solar Probe observations, we investigate how the brightness changes when the observer moves closer to the Sun. This brightness change is influenced by the dust number density along the line of sight and by the changing scattering geometry.</p><p>-Stenborg G., Howard R. A., and Stauffer J. R., 2018: Characterization of the White-light Brightness of the F-corona between 5° and 24° Elongation, Astrophys. J. 862: 168 (21pp).</p><p>-Howard, R.A. and 25 co-authors, 2019: Near-Sun observations of an F-corona decrease and K-corona fine structure, Nature 576, 232–236.</p>

scholarly journals Long distance non-line-of-sight (NLOS) visible light signal detection based on rolling-shutter-patterning of mobile-phone camera

2017 ◽  
Vol 25 (9) ◽  
pp. 10103 ◽  
Author(s):  
Wei-Chung Wang ◽  
Chi-Wai Chow ◽  
Liang-Yu Wei ◽  
Yang Liu ◽  
Chien-Hung Yeh
Keyword(s):  
Visible Light ◽  
Signal Detection ◽  
Mobile Phone ◽  
Light Signal ◽  
Line Of Sight ◽  
Long Distance ◽  
Mobile Phone Camera ◽  
Non Line Of Sight

scholarly journals A single-scatter path loss model for non-line-of-sight ultraviolet channels

2012 ◽  
Vol 20 (9) ◽  
pp. 10359 ◽  
Author(s):  
Yong Zuo ◽  
Houfei Xiao ◽  
Jian Wu ◽  
Yan Li ◽  
Jintong Lin
Keyword(s):  
Path Loss ◽  
Line Of Sight ◽  
Loss Model ◽  
Path Loss Model ◽  
Single Scatter ◽  
Non Line Of Sight

Long‐distance non‐line‐of‐sight ultraviolet communication channel analysis: experimentation and modelling

2015 ◽  
Vol 9 (5) ◽  
pp. 223-231 ◽  
Author(s):  
Linchao Liao ◽  
Robert J. Drost ◽  
Zening Li ◽  
Tian Lang ◽  
Brian M. Sadler ◽  
...  
Keyword(s):  
Communication Channel ◽  
Line Of Sight ◽  
Long Distance ◽  
Channel Analysis ◽  
Ultraviolet Communication ◽  
Non Line Of Sight

Performances of Non-Line-of-Sight Ultraviolet Multi-Scatter Propagation for Noncoplanar Geometries

2012 ◽  
Vol 571 ◽  
pp. 214-218
Author(s):  
Yi Nan Tang ◽  
Xiao Ping Xie ◽  
Wei Zhao
Keyword(s):  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Monte Carlo Method ◽  
Impulse Response ◽  
Mathematical Description ◽  
Pulse Width ◽  
Path Loss ◽  
Propagation Model ◽  
Line Of Sight ◽  
Non Line Of Sight

A multi-scatter propagation model based on Monte Carlo method is presented. This model can be applied to all the geometries, including coplanar or noncoplanar scenario. The mathematical description of this model is deduced. We obtain the spatial positions of photon with three Cartesian coordinates after each propagation step and the received judgment conditions. Employing a photon tracing technique, Monte Carlo simulation is performed to investigate the signal impulse response and the path loss. The results indicate that, when the off-axis angle increases, the amplitude of the impulse response decreases, while the path loss increases. In addition, it is observed that the pulse width increases with the off-axis angle.

scholarly journals Strategies for Deploying a Sensor Network to Explore Planetary Lava Tubes

Sensors ◽  
2021 ◽  
Vol 21 (18) ◽  
pp. 6203
Author(s):  
Himangshu Kalita ◽  
Jekan Thangavelautham
Keyword(s):  
Low Cost ◽  
Line Of Sight ◽  
Communication Link ◽  
Wireless Power ◽  
Lava Tube ◽  
Long Distance ◽  
Lava Tubes ◽  
Distance Communication ◽  
High Resolution Images ◽  
Exploration Mission

Recently discovered pits on the surface of the Moon and Mars are theorized to be remnants of lava tubes, and their interior may be in pristine condition. Current landers and rovers are unable to access these areas of high interest. However, multiple small, low-cost robots that can utilize unconventional mobility through ballistic hopping can work as a team to explore these environments. In this work, we propose strategies for exploring these newly discovered Lunar and Martian pits with the help of a mother-daughter architecture for exploration. In this architecture, a highly capable rover or lander would tactically deploy several spherical robots (SphereX) that would hop into the rugged pit environments without risking the rover or lander. The SphereX robots would operate autonomously and perform science tasks, such as getting inside the pit entrance, obtaining high-resolution images, and generating 3D maps of the environment. The SphereX robot utilizes the rover or lander’s resources, including the power to recharge and a long-distance communication link to Earth. Multiple SphereX robots would be placed along the theorized caves/lava tube to maintain a direct line-of-sight connection link from the rover/lander to the team of robots inside. This direct line-of-sight connection link can be used for multi-hop communication and wireless power transfer to sustain the exploration mission for longer durations and even lay a foundation for future high-risk missions.

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