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检索条件"任意字段=Conference on Design and Engineering of Optical Systems II"

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Research on Improved TDOA Algorithm for Shallow Water Underwater Positioning 16

Research on Improved TDOA Algorithm for Shallow Water Underw...

引用

16th International conference on Signal Processing systems, ICSPS 2024

作者： Shen, Biyue Rong, Shaowei Ji, Lingxian Wu, Kaiyuan Li, Jiaju Deng, Xiangyu Faculty of Information Engineering and Automation Kunming University of Science and Technology Kunming650500 China Faculty of Artificial Intelligence Industry Kunming University of Science and Technology Kunming650500 China

ISBN: (纸本)9781510689251

Accurate positioning in shallow water regions is crucial for various underwater applications. TDOA algorithms estimate the signal source location by measuring the time differences of signal arrival at multiple receivers. However, these methods often suffer from Non-Line-of-Sight (NLOS) errors and noise, leading to reduced positioning accuracy in shallow water environments. This research proposes an improved TDOA estimation algorithm that utilizes cross-correlation techniques to mitigate NLOS errors and combines the strengths of the Chan and Taylor algorithms to enhance positioning precision. The proposed algorithm addresses challenges such as time ambiguity and alpha-stable noise, offering advantages in TDOA modeling for underwater positioning. Implementation details are provided, including the design of matching basis functions, time delay matching procedures, algorithm flow, and computational steps. Simulation tests validate the effectiveness of the algorithm, demonstrating significant improvements in positioning accuracy. The computational complexity is also analyzed to assess the algorithm's practicality. Finally, the research findings are summarized, and directions for future work are discussed. © 2025 SPIE.

关键词： Time difference of arrival

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Signal timing analysis and optimization of urban combined traffic intersections 4

Signal timing analysis and optimization of urban combined tr...

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2024 4th International conference on Intelligent Traffic systems and Smart City, ITSSC 2024

作者： Feng, Pengfei Jin, Huiqing Xu, Jiajian Lu, Mingyu School of Traffic Engineering Anhui Sanlian University Hefei230601 China The Key Laboratory of Traffic Informationand Safety of Anhui Higher Education Institutes Hefei230601 China

ISBN: (纸本)9781510686304

The management and control of the intersection at the junction of cities and towns is more difficult because of its complex flow of people and vehicles. Through the effective analysis of intersection traffic and the continuous optimization of signal timing, it is an important means to ensure the orderly passage of suburban intersections. Taking the typical Zijin intersection in the south of Hefei City as an example, the video surveillance system of the intersection carried out traffic investigation and data analysis on vehicle speed, vehicle density, delay, etc., designed a more reasonable signal timing scheme for the intersection, and planned to effectively improve the traffic efficiency of the intersection during peak hours. This research method and design scheme can promote similar urban intersection traffic research, and has certain reference significance for alleviating urban road traffic congestion. © 2025 SPIE.

关键词： Traffic congestion

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Buffering Performance of optical Packet Switch Consisting of Hybrid Buffer 1

引用

International conference on Advances in Data-driven Computing and Intelligent systems, ADCIS 2022

作者： Chandra, Sumit Fatima, Shahnaz Suryavanshi, Raghuraj Singh Amity Institute of Information Technology Amity University Uttar Pradesh Lucknow Campus Lucknow India Department of Computer Science and Engineering Pranveer Singh Institute of Technology Kanpur India

ISBN: (数字)9789819932504

ISBN: (纸本)9789819932498

The design of optical packet switches is an important problem as they are integral parts of optical networks and high-speed data centers. Various types of optical switches under different contention resolution techniques like deflection with no buffer, with input buffer, shared and output buffer, and negative acknowledgment are presented. In this paper, a shared buffering scheme that uses hybrid buffers that use optical and electronic buffers for congestion control of the packets, as well as to minimize the re-transmission of the blocked packets, an input buffering scheme is considered. A Monte Carlo simulation is performed to evaluate the packet loss performance of electronic and optical buffers. It has been found that packet loss as well as the number of re-transmitted packets is reduced on inclusion of an input buffer. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Packet loss

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Thirty Meter Telescope Laser Guide Star Facility Preliminary design Completion 9

Thirty Meter Telescope Laser Guide Star Facility Preliminary...

引用

conference on Adaptive Optics systems IX

作者： Trubey, M. Boyer, C. Wang, L. Irarrazaval, B. Miles, J. Vogiatzis, K. Ebbers, A. Santoro, F. TMT Int Observ 100 W Walnut St Pasadena CA 91124 USA

ISBN: (纸本)9781510675186;9781510675179

The Laser Guide Star Facility (LGSF) system of the Thirty Meter Telescope (TMT) will generate up to 8 artificial laser guide stars in the mesospheric sodium layer with the brightness, beam quality, and asterism geometries as required by both the TMT first light AO system and future AO instruments. It includes the sodium lasers mounted on the telescope elevation structure below the primary mirror, the conventional beam transfer optics system to transport the beams up to the telescope top end, and the formatting and launching optics to project the required laser guide star asterism to the sky using a center launch telescope located behind the secondary mirror. In this paper, we will present the recent successful completion of the LGSF preliminary design, including: the optical, mechanical, electronics, safety, control, and software designs;the systems engineering;the modeling activities;and the next steps for the system's final design phase including prototyping.

关键词： Laser Guide Star Facility Extremely Large Telescope Sodium Laser

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SENSOR PACKAGE DEPLOYMENT AND RECOVERY CONE WITH INTEGRATED VIDEO STREAMING FOR RAPID STRUCTURAL HEALTH MONITORING 17

SENSOR PACKAGE DEPLOYMENT AND RECOVERY CONE WITH INTEGRATED ...

引用

ASME conference on Smart Materials, Adaptive Structures and Intelligent systems (SMASIS)

作者： Satme, Joud N. Yount, Ryan Goujevskii, Nikita Jannazzoi, Luke Downey, Austin R. J. Univ South Carolina Dept Mech Engn Columbia SC 29208 USA Univ South Carolina Dept Civil & Environm Engn Dept Mech Engn Columbia SC 29208 USA

ISBN: (纸本)9780791888322

This study presents an approach for structural health monitoring (SHM) of remote and hazardous structures using unpiloted aerial vehicles (UAVs). The method focuses on overcoming the challenges associated with traditional sensor deployment techniques, which are often costly and risky due to the decaying nature of the targeted structures. Utilizing a multi-rotor UAV platform, a streaming camera is integrated into a recovery cone to aid in visual alignment during deployment and retrieval providing a safe and cost-effective means of sensor delivery. The paper covers the design of a video-broadcasting deployment system with integrated electropermanent magnets (EPMs), housed in a 3D-printed recovery cone, supplemented by redundancy measures to enhance safety and reliability. This proposed system significantly improves the user's spatial awareness and aids in precise sensor package alignment, facilitated by multiple camera views providing a dual purpose of conducting visual inspection in addition to aiding in sensor delivery. The experimental analysis presented in this study validates the system's effectiveness, demonstrating the utility of camera-aided sensor delivery for rapid SHM applications. Navigation challenges due to proximity to metal structures and the difficulties associated with signal strength and reflections are also reported. The contribution of this work is a methodology for aerial sensor deployment and retrieval using a lightweight 3D-printed recovery cone with integrated cameras for navigation and sensor alignment.

关键词： Additive manufacturing Safety Rotors Signals Sensors Aircraft Redundancy (engineering) Experimental analysis Reflection Unmanned aerial vehicles Reliability design optical quality control Magnets Metalwork Structural health monitoring Navigation

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Enhanced performance integral imaging 3D display method using quarter-overlapped microlens arrays

Enhanced performance integral imaging 3D display method usin...

引用

2021 International conference on optical Instruments and Technology: optical systems, Optoelectronic Instruments, Novel Display, and Imaging Technology

作者： Zhao, Nai-Qin Liu, Juan Zhao, Zi-Feng Beijing Engineering Research Center for Mixed Reality and Advanced Display School of Optics and Photonics Beijing Institute of Technology Beijing100081 China

ISBN: (纸本)9781510655591

An integral (ii) imaging method using quarter-overlapped microlens arrays (QOMLA) is proposed to improve the display performance. The principle and the simulation of POMLA is analyzed by geometric optics and wave optics, and the optical experiments verify the enhancement of performance. POMLA can double the angular sampling density of ii systems in each dimension to increase the spatial resolution, and is able to construct multiple central depth planes by adjusting the gap between the two layers to expand the depth of field. Moreover, POMLA is easier to be processed compared with the same lenslets size single-layer microlens array and reduces the processing cost. © 2022 SPIE.

关键词： Three dimensional displays

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design of Cellulose Acetate Electrospun Membranes Loaded with N-doped Carbon Quantum Dots for Water Remediation 1

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7th International-Water-Association (IWA) Regional Membrane Technology conference (IWA-RMTC)

作者： Viscusi, Gianluca Mottola, Stefania Tohamy, Hebat-Allah S. Gorrasi, Giuliana De Marco, Iolanda Univ Salerno Dept Ind Engn Via Giovanni Paolo II 132 I-84084 Salerno Italy Univ Salerno Res Ctr Biomat BIONAM Via Giovanni Paolo II 132 I-84084 Salerno Italy Natl Res Ctr Cellulose & Paper Dept PO 12622 Giza Egypt

ISBN: (数字)9783031633577

ISBN: (纸本)9783031633591;9783031633577;9783031633560

This work focuses on the use of Nitrogen-doped carbon quantum dots (CQDs) from pinewood sawdust loaded in cellulose acetate (CA) membranes produced by electrospinning. These membranes were tested for the removal of two organic dyes, methylene blue (MB) and methylene violet (MV), from water effluents. The adsorption capacity of electrospun adsorbent significantly improved due to the presence of a low concentration of CDQs (1% w/w). In comparison with CA electrospun membranes without CQDs, the loaded membranes showed an improvement of the adsorption capacity equal to 160% in the case of MB and 300% in the case of MV. Therefore, the presence of CQDs from sawdust noticeably enhanced the adsorption of cationic dyes onto polymeric membranes. The designed systems exploit the adsorption features ofmicrometric-sized fibrous mats to remove organic pollutants from industrial textile wastewater effectively. It is worth mentioning that composite adsorbent systems can be efficiently applied to real industrial cases because of the possibility of reusing them and opening the route to the fabrication of novel and highly performant adsorbents.

关键词： Electrospinning wastewater treatment carbon quantum dots

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SIW Filter design based on Artificial Bee Colony Optimization 3

SIW Filter Design based on Artificial Bee Colony Optimizatio...

引用

3rd International conference on Innovative Research in Applied Science, engineering and Technology, IRASET 2023

作者： Akkader, Souad Bouyghf, Hamid Baghdad, Abdennaceur Hassan Ii University Laboratory of Electronics Energy Automatics and Data Processing Faculty of Science and Techniques Mohammedia Morocco Hassan Ii University Laboratory of Engineering Sciences and Biosciences Faculty of Science and Techniques Mohammedia Morocco

ISBN: (纸本)9798350398366

An optimal design of Substrate Integrated Waveguide dual band filter is presented in this article using the artificial bee colony Metaheuristic;the performance results are obtained using MATLAB programing language. Furthermore, Ansys HFSS software validates the dimensions acquired, demonstrating that two resonance peaks are available;first one occurs at 8.9GHz with reflection coefficient of -41dB and insertion loss -0.14dB, and second resonance occurs at 10GHz with a reflection coefficient of -41.9dB with insertion loss -0.2dB. Both resonances are given concentrated bandwidth: 0.15GHz and 0.3GHz respectively with an attenuation constant optimum around 0.42 dB/m. designed filter meets the requirement of multiband and miniaturized components very demand in modern telecommunication systems © 2023 IEEE.

关键词： Substrate integrated waveguides

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VLC positioning in low data rate for V2V communication 2024

VLC positioning in low data rate for V2V communication

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12th Euro-American conference on Telematics and Information systems, EATIS 2024

作者： Giraldo, Luis Miguel Soler, Joaquin Perez Botella-Mascarell, Carmen Juan, Vicent Girbes Varea, Sandra Roger Torres, Julio Martos Olcina, Raimundo Garcia Electronical Engineering Department Universitat de València Burjassot Valencia46100 Spain Computer Science Department Informatics Department Universitat de València Burjassot Valencia46100 Spain

ISBN: (纸本)9798400717338

The creation and implementation of a system that bridges visible light communication (VLC) with selected identifiers, envisioned as informational beacons, are outlined. This system is adept at controlling LED panels and orchestrating communication between LED lights and the receiving unit, laying the groundwork for vehicle-to-vehicle (V2V) communication systems tailored for precise positioning. The design and assessment of test-bed requirements cater to the anticipation of future V2V optical wireless communication scenarios. Through analysis, it is demonstrated that commercial outdoor lighting can be effectively utilized for V2V positioning, capable of operating under daylight with a data transmission rate of 100 Kbps. Crucially, the system's ability to accurately detect positioning beacons facilitates the localization of vehicles within designated areas of interest, paving the way for the advancement of V2V communication technologies. This comprehensive approach not only validates the feasibility of using VLC for vehicle positioning but also sets a precedent for future developments in V2V communication systems. © 2024 Owner/Author.

关键词： optical communication

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A Free Space optical Link Model for C-band Data and Power Transmission 36

A Free Space Optical Link Model for C-band Data and Power Tr...

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conference on Free-Space Laser Communications XXXVI

作者： Ali, Idriss Amadou Wilson, D. Paige Beattie, Meghan N. Hogan, Ryan Rajaram, Narmada Cheriton, Ross Atieh, Ahmad Hinzer, Karin Univ Ottawa Sch Elect Engn & Comp Sci SUNLAB Ottawa ON Canada Optiwave Syst Inc Ottawa ON Canada Natl Res Council Canada Adv Elect & Photon Res Ctr 1200 Montreal Rd Ottawa ON K1A 0R6 Canada

ISBN: (纸本)9781510670150;9781510670143

The emerging technology of power-by-light enables power and data delivery over a single free space optical (FSO) link for electrically isolated, interference-free remote operation. Telecom wavelength bands (lambda approximate to 1550 nm) are well known for applications in data communication over optical fiber and overlap atmospheric transparency windows, extending the reach of FSO power and data systems through the air. This creates the opportunity to directionally deliver significant power (above 1mW) and high speed data wirelessly over long distances. FSO channels can experience turbulence and weather conditions that affect data and power transmission. Hence they should be modeled and verified against measurements under varied atmospheric conditions. This will help improve model precision and robustness in predicting FSO channel performance. Accurate modeling of data transmission in FSO channels is urgently required to support the design of wireless optical communication systems for remote areas to which fiber deployment is difficult or uneconomic and instead long range data communications between ground stations and high-altitude platform systems (HAPS) may be employed. We have modelled an FSO channel transmitting data and power at 1550 and 1520 nm respectively under various meteorological conditions. The system model was developed in the commercially available OptiSystem software for modeling signals transmission. Different weather conditions translate directly to different FSO channel signal attenuations, impacting both data and power transmission. We also explore the impact of different modulation schemes such as Quadratic Amplitude Modulation (QAM), Pulse Amplitude Modulation (PAM), and Quadratic Phase Shift Keying(QPSK) on the bit error rate of the transmitted data thereby achieving the optimal required hardware design parameters. We found that QPSK is predicted to have the longest viable FSO range across all weather conditions and that power cannot be trans

关键词： Free Space Optics data transmission modulation two diode model Photonic Power Converter

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