scholarly journals Frontier Progress of Unmanned Aerial Vehicles Optical Wireless Technologies

Sensors ◽  
2020 ◽  
Vol 20 (19) ◽  
pp. 5476
Author(s):  
Jupeng Ding ◽  
Hongye Mei ◽  
Chih-Lin I ◽  
Hui Zhang ◽  
Wenwen Liu
Keyword(s):  
Unmanned Aerial Vehicles ◽  
Transmission Rate ◽  
Experimental Testing ◽  
High Reliability ◽  
Communication Link ◽  
Optical Wireless ◽  
Wireless Technology ◽  
Technical Problems ◽  
Practical Applications ◽  
Aerial Vehicles

With the continuous maturity of unmanned aerial vehicles (UAV) in materials, communications, and other related technologies, the UAV industry has developed rapidly in recent years. In order to cope with the diversified emerging business forms, the explosive growth of the scale of data traffic, number of terminal connections, high reliability, low-latency, and high transmission rate provided by the fifth generation (5G) network will inject new vitality into the development of the UAVs industry. In this paper, optical wireless technology is introduced into the UAV platform, combining theory with practical applications. We explain many research advances and key technologies in the four aspects of “air, space, earth, and sea” to achieve a strong and broadband communication link. This discussion focuses on link modeling, parameter optimization, experimental testing, and the status quo of UAVs in different application scenarios with optical wireless link configurations. At the same time, based on the current situation of UAV optical wireless technology, the technical problems and the research direction in the future are also discussed.

Impact of Various Parameters on the Performance of Inter-aircraft Optical Wireless Communication Link

2017 ◽  
Vol 39 (1) ◽  
Author(s):  
Mehtab Singh
Keyword(s):  
Wireless Communication ◽  
Transmission Rate ◽  
Power Level ◽  
Communication Link ◽  
Optical Wireless Communication ◽  
Optical Wireless ◽  
Antenna Aperture ◽  
Aperture Diameter ◽  
Pointing Error ◽  
The Impact

AbstractOptical wireless communication (OWC) systems also known as Free space optics (FSO) are capable of providing high channel bandwidth, high data transmission rates, low power consumption, and high security. OWC links are being considered in different applications such as inter-satellite links, terrestrial links, and inter-aircraft communication links. This paper investigates the impact of different system parameters such as transmission power level, operating wavelength, transmitter pointing error angle, bit transmission rate, atmospheric attenuation, antenna aperture diameter, geometric losses, the responsivity of the photodetector, and link range on the performance of inter-aircraft optical wireless communication link.

scholarly journals Practical Endurance Estimation for Minimizing Energy Consumption of Multirotor Unmanned Aerial Vehicles

Energies ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 2221 ◽  
Author(s):  
Myeong-hwan Hwang ◽  
Hyun-Rok Cha ◽  
Sung Yong Jung
Keyword(s):  
Drag Coefficient ◽  
Unmanned Aerial Vehicles ◽  
Estimation Method ◽  
Flight Test ◽  
Flight Time ◽  
Average Error ◽  
Practical Applications ◽  
Aerial Vehicles ◽  
Vehicle Shape ◽  
Battery Discharge

The practically applicable endurance estimation method for multirotor unmanned aerial vehicles (UAVs) using a battery as a power source is proposed. The method considers both hovering and steady-level flights. The endurance, thrust, efficiency, and battery discharge are determined with generally available data from the manufacturer. The effects of the drag coefficient related to vehicle shape and payload weight are examined at various forward flight speeds. As the drag coefficient increases, the optimum speed at the minimum required power and the maximum endurance are reduced. However, the payload weight causes an opposite effect, and the optimal flying speed increases with an increase in the payload weight. For more practical applications for common users, the value of S × Cd is determined from a preliminary flight test. Given this value, the endurance is numerically estimated and validated with the measured flight time. The proposed method can successfully estimate the flight time with an average error of 2.3%. This method would be useful for designers who plan various missions and select UAVs.

Cross-Layer Scheme for Meeting QoS Requirements of Flying Ad-Hoc Networks

2017 ◽  
pp. 255-281
Author(s):  
Bilal Muhammad Khan ◽  
Rabia Bilal
Keyword(s):  
Ad Hoc Networks ◽  
Unmanned Aerial Vehicles ◽  
Ad Hoc ◽  
High Reliability ◽  
Mac Protocols ◽  
Low Latency ◽  
Data Delivery ◽  
Mobility Models ◽  
Aerial Vehicles ◽  
Hoc Networks

Recently, Flying Ad-hoc Networks (FANETs), enabling ad-hoc networking between highly mobile Unmanned Aerial Vehicles (UAVs), are gaining importance in several military, commercial and civilian applications. The sensitivity of these missions requires precise and prompt data delivery. Thus, the most important communication requirements that need to be addressed while designing FANETs are of high reliability and low latency. Considering these demands, this chapter focusses on mobility models, MAC protocols and routing protocols.

scholarly journals New ‘Foucauldian Boomerangs’: Drones and Urban Surveillance

2016 ◽  
Vol 14 (1) ◽  
pp. 20-33 ◽  
Author(s):  
Ole B. Jensen
Keyword(s):  
Unmanned Aerial Vehicles ◽  
Michel Foucault ◽  
Research Agenda ◽  
Surveillance Studies ◽  
Practical Applications ◽  
Aerial Vehicles ◽  
Historical Importance ◽  
The Future ◽  
Police Forces ◽  
Urban Police

This paper uses the metaphor of ‘boomerangs’ articulated by Michel Foucault to discuss the potential for drones to become the ‘next layer’ of urban surveillance in our cities. Like earlier Western technologies and techniques of government that were ‘tested out’ in foreign warzones and then ‘brought back’ to urban centres (the helicopter and its utilization in Vietnam and its return to urban police forces is a clear illustration hereof), contemporary unmanned aerial vehicles hold the potential to act as proverbial ‘Foucauldian boomerangs’ and return from warzones in Afghanistan, Iraq, and Pakistan to Western cities. The paper explores how a nexus of Surveillance Studies and mobilities research may be a fruitful way into comprehending this new phenomenon. En route the practical applications of drones as well as the historical importance of aerial power are connected to a situational understanding of mobilities. The paper points at a number of challenges for the future and should be understood as a first tentative attempt to set this on the research agenda.

scholarly journals RESEARCH FEATURES OF AEROELASTIC OSCILLATIONS OF UNMANNED AERIAL VEHICLES WITH ELECTRIC ACTUATOR OF RUDDERS

2018 ◽  
Vol 21 (4) ◽  
pp. 73-83
Author(s):  
A. V. Bykov ◽  
S. G. Parafes ◽  
V. I. Smyslov
Keyword(s):  
Unmanned Aerial Vehicles ◽  
Modular Design ◽  
Experimental Studies ◽  
Operation Time ◽  
Gear Ratio ◽  
Elastic Structure ◽  
Normal Operation ◽  
Technical Problems ◽  
Aerial Vehicles ◽  
Almost All

Designing a modern flight vehicle is associated with the need to solve many scientific and technical problems. These tasks include the prevention of insecure self-oscillations in flight, taking into account the elasticity of the structure. These problems relate to dynamic aeroelasticity, a science that examines the interaction of an elastic structure (at its oscillation) with an air flow. Maneuverable unmanned aerial vehicles (UAVs) are considered. Since UAVs are essentially not used without an automatic control system (ACS), its presence must be taken into account when considering the vibrations of an elastic structure in flight. The influence of the elasticity of UAV design on the operation of ACS in flight is manifested in the possibility of self-oscillations in the loop "elastic UAV – ACS". Self-oscillations lead to disruption of normal operation of the onboard equipment or its failure. The complexity of the problem requires its consideration at almost all stages of UAV’s development, including the creation of a prototype and testing. The computational and experimental studies of the characteristics of elastic oscillations in the UAV flight of the cross-shaped scheme are considered. The features of these UAVs (options with a modular design, the nonlinearity of the airframe, rudders, ACS, and others) due to a significant amount of testing that is the basis for the calculations. Electric actuators have a small continuous operation time, and resource use, there are gearboxes with a large gear ratio and backlashes. This determines the dependence of the rotation rigidity of the rudders on the amplitude and frequency, as well as a significant increase in the total moments of inertia. The technique of bench experiment with obtaining data to assess the boundaries of the flutter and the boundaries of the stability of the loop "elastic UAV – ACS" is given. The questions of improvement of the stabilization system of UAV required for the study of its stability at frequencies of elastic oscillations are considered, as well as the evaluation of the limiting cycles of self-oscillations is given.

Scientific and technical problems of creation of unmanned aircraft dual-purpose transportation systems abroad

2021 ◽  
pp. 168-181
Author(s):  
D.B. Iziumov ◽  
E.L. Kondratyuk
Keyword(s):  
Unmanned Aerial Vehicles ◽  
Transportation Systems ◽  
Unmanned Aircraft ◽  
Dual Use ◽  
Dual Purpose ◽  
Technical Problems ◽  
Aerial Vehicles ◽  
Foreign Countries ◽  
Vehicle Systems ◽  
Aerial Vehicle

The article discusses the main tasks, tactical and technological requirements imposed by the leadership of defense departments of leading foreign countries for the designing and development of transport (cargo) unmanned aerial vehicles (UAVs), as well as the tactical and technical characteristics of existing and in service foreign models of transport (cargo) UAV. An overview of programs (projects) for the development and creation of promising dual-use unmanned aerial vehicle systems is presented. The main scientific and technological problems of their creation and development abroad are summarized.

Cross-Layer Scheme for Meeting QoS Requirements of Flying Ad-Hoc Networks

2019 ◽  
pp. 102-130
Author(s):  
Bilal Muhammad Khan ◽  
Rabia Bilal
Keyword(s):  
Ad Hoc Networks ◽  
Unmanned Aerial Vehicles ◽  
Ad Hoc ◽  
High Reliability ◽  
Mac Protocols ◽  
Low Latency ◽  
Data Delivery ◽  
Mobility Models ◽  
Aerial Vehicles ◽  
Hoc Networks

Recently, Flying Ad-hoc Networks (FANETs), enabling ad-hoc networking between highly mobile Unmanned Aerial Vehicles (UAVs), are gaining importance in several military, commercial and civilian applications. The sensitivity of these missions requires precise and prompt data delivery. Thus, the most important communication requirements that need to be addressed while designing FANETs are of high reliability and low latency. Considering these demands, this chapter focusses on mobility models, MAC protocols and routing protocols.

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