Results 11 to 20 of about 123,203 (295)
IEEE Access, 2020 The chaotic direct sequence spread spectrum (CD3S) is one of the distinguished techniques providing physical layer secrecy and low probability of intercept (LPI) in wireless communication.
Guogang Yuan +4 more
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Progressive Failure Analysis of Laminated CFRP Composites under Three-Point Bending Load
Advances in Materials Science and Engineering, 2022 In this paper, the mechanical behavior and damage evolution of CFRP laminates under three-point bending loads were investigated. Based on the three-dimensional Hashin failure criterion and cohesive zone method, a progressive damage analysis model was ...
Bing Shen +4 more
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Equipment Mission Safety Evaluation Method Based on Function-Structure
IEEE Access, 2021 Safety is the eternal theme of aviation activities. With the rapid development of military technology and equipment construction, the new equipment requires safer and more reliable technology and management guarantees.
Yujin Chen +4 more
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Circular array antenna tor UAV-UAV communications [PDF]
2017 11th European Conference on Antennas and Propagation (EUCAP), 2017 Nowadays, the communications links limit the autonomy of unmanned aerial vehicles (UAV). In this paper, a multichannel long-range communication link for UAVs with high quality of service, moderate bandwidth and affordable cost is proposed. This link is deployed by using a second UAV as a communications relay and it provides bidirectional coverage for ...
Sun, Xiaoliang +5 more
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Hostile UAV Detection and Neutralization Using a UAV System
Drones, 2022 The technologies of Unmanned Aerial Vehicles (UAVs) have seen extremely rapid development in recent years. UAV technologies are being developed much faster than the means of their legislation. There have been many means of UAV detection and neutralization proposed in recent research; nonetheless, all of them have serious disadvantages.
Saulius Rudys +9 more
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Three Dimensional UAV Positioning for Dynamic UAV-to-Car Communications [PDF]
Sensors, 2020 In areas with limited infrastructure, Unmanned Aerial Vehicles (UAVs) can come in handy as relays for car-to-car communications. Since UAVs are able to fully explore a three-dimensional environment while flying, communications that involve them can be affected by the irregularity of the terrains, that in turn can cause path loss by acting as obstacles.
Seilendria A. Hadiwardoyo +6 more
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Two-Level Hierarchical-Interaction-Based Group Formation Control for MAV/UAVs
Aerospace, 2022 Cooperative group formation control of manned/unmanned aircraft vehicles (MAV/UAVs) using a hierarchical framework can be more efficient and flexible than centralized control strategies.
Huan Wang +3 more
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Numerical Simulation of Continuous Tilting Transition of Tiltrotor Aircraft
Hangkong gongcheng jinzhan, 2021 The aerodynamic configuration of the tiltrotor aircraft is constantly changed during the tilting transition process, and the aerodynamic characteristics is of strongly nonlinear characteristics.Aiming at the complex states of continuous tilting ...
WU Weiwei +3 more
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IEEE Access, 2022 Weighted fractional Fourier transform encrypted chaotic direct sequence spread spectrum (WFRFT-CD3S) signal is aperiodic and complex Gaussian distributed.
Jiangyan He +3 more
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Ciencia y Salud, 2021 Objetivo: describir los resultados de un proyecto de mejora de la atención a adolescentes embarazadas víctimas de violencia, ejecutado en un hospital público.
Peter De Wannemaeker +1 more
doaj +1 more source