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检索条件"机构=Weapons Robotics and Control Engineering Department"

共 48 条记录，以下是31-40 订阅

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Spatial and Temporal Study of controlled Underwater Optical Turbulence from Synchronous Measurements

Spatial and Temporal Study of Controlled Underwater Optical ...

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Propagation Through and Characterization of Atmospheric and Oceanic Phenomena, pcAOP 2024 - Part of Optica Imaging Congress

作者： Avramov-Zamurovic, Svetlana Ferlic, Nathaniel A. Kelly, Thomas O’Malley, Owen Judd, K. Peter Weapons Robotics and Control Engineering Department United States Naval Academy 597 McNair Rd. Hopper Hall AnnapolisMD21402 United States Naval Air Warfare Center Aircraft Division 22347 Cedar Point Road Patuxent RiverMD20670 United States United States Naval Research Laboratory 4555 Overlook Ave. SW WashingtonDC20375 United States

We experimentally record intensity of laser light at the pupil and focal planes after propagation through underwater optical turbulence. We study the temporal and spatial properties of intensity correlations and angle...

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Systematic Study of Optical Turbulence in Rayleigh-Bénard Underwater Convection

Systematic Study of Optical Turbulence in Rayleigh-Bénard U...

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2023 Propagation Through and Characterization of Atmospheric and Oceanic Phenomena, pcAOP 2023 in Optica Imaging Congress - Part of Imaging and Applied Optics Congress 2023

作者： O'Malley, Owen Avramov-Zamurovic, Svetlana Ferlic, Nathaniel A. Judd, K. Peter Weapons Robotics and Control Engineering Department United States Naval Academy 597 McNair Rd. Hopper Hall AnnapolisMD21402 United States 22347 Cedar Point Road Patuxent RiverMD20670 United States United States Naval Research Laboratory 4555 Overlook Ave. SW WashingtonDC20375 United States

Synchronized optical wavefront and intensity measurements are used to characterize the optical turbulence generated by Rayleigh-Bénard convection. We find refractive index structure constant and the shape of the ... 详细信息

ISBN: (纸本)9781957171289

关键词： Refractive index

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Process Assurance for Object Detection Through Deep Neural Networks to Accomplish the Autonomous Aerial Refueling Task

Process Assurance for Object Detection Through Deep Neural N...

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Automated Vehicle Validation Conference (IAVVC), IEEE International

作者： Danielle Clement Sarah Mottino Donald Costello Aeronautics Division Lockheed Martin Corporation Fort Worth Texas United States Weapons Robotics and Control Engineering Department United States Naval Academy Annapolis Maryland United States

This paper presents a high level discussion on certifying of a deep neural network to build situational awareness for an autonomous vehicle to complete the aerial refueling task through object detection verification a...

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Wavefront Characterization of a Gaussian Beam after Propagation through Optical Turbulence Generated by Rayleigh-Bénard Convection

Wavefront Characterization of a Gaussian Beam after Propagat...

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CLEO: Science and Innovations, CLEO:S and I 2023 - Part of Conference on Lasers and Electro-Optics 2023

作者： O’Malley, Owen M. Avramov-Zamurovic, Svetlana Ferlic, Nathaniel A. Mullen, Linda J. Peter Judd, K. Weapons Robotics and Control Engineering Department United States Naval Academy Hopper Hall 597 McNair Rd AnnapolisMD21402 United States 22347 Cedar Point Road Patuxent RiverMD20670 United States United States Naval Research Laboratory 4555 Overlook Ave. SW WashingtonDC20375 United States

A Gaussian beam is propagated through a water tank containing Rayleigh-Bénard convection. The beam wavefront is measured using a Shack-Hartmann sensor to obtain optical wavefront statistics for characterization o... 详细信息

ISBN: (纸本)9781957171258

关键词： Gaussian beams

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Machine Learning-Based Underwater Communication System Using Light Carrying Orbital Angular Momentum

Machine Learning-Based Underwater Communication System Using...

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Conference on Lasers and Electro-Optics (CLEO)

作者： William A. Jarrett Svetlana Avramov-Zamurovic Joel M. Esposito Charles Nelson Weapons Robotics and Control Engineering Department United States Naval Academy Electrical and Computer Engineering Department United States Naval Academy Annapolis Maryland USA

An underwater communication system using light carrying orbital angular momentum is evaluated using a convolutional neural network through simulated and experimental thermally-generated underwater optical turbulence. ... 详细信息

ISBN: (数字)9781957171050

ISBN: (纸本)9781665466660

关键词： Underwater communication Optical computing Optical fiber networks Lasers and electrooptics Orbits Convolutional neural networks Electrooptical waveguides

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The impact of optical turbulence created by Rayleigh Benard convection on vortex structure in beams carrying orbital angular momentum

The impact of optical turbulence created by Rayleigh Benard ...

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Propagation Through and Characterization of Atmospheric and Oceanic Phenomena, pcAOP 2022

作者： Avramov-Zamurovic, Svetlana Judd, K.P. Matt, S. Handler, R.A. Watnik, A.T. Weapons Robotics and Control Engineering Department United States Naval Academy MD United States Naval Research Laboratory WashingtonDC United States Naval Research Laboratory Stennis Space Center MS United States George Mason University FairfaxVA United States

We simulate Rayleigh Benard natural convection in air and propagate Gaussian Laguerre beams with varying topological charge through it. We present the impact of the optical turbulence on the phase and intensity of the... 详细信息

ISBN: (纸本)9781557528209

关键词： Natural convection

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Optimizing Drone Operator Workload in the Terminal Area for Shipboard Operations

Optimizing Drone Operator Workload in the Terminal Area for ...

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International Conference on Unmanned Aircraft Systems (ICUAS)

作者： Nicholas Bostock Adrien Richez Maneesha Wickramasuriya Allison Webster-Giddings Donald Costello Aerospace Engineering Department United States Naval Academy Annapolis Maryland United States Mechanical and Aerospace Engineering Department George Washington University Washington DC College of Education and Human Development American University of Iraq Baghdag Iraq Weapons Robotics and Control Engineering Department United States Naval Academy Annapolis Maryland United States

ISBN: (数字)9798350357882

ISBN: (纸本)9798350357899

The United States Navy (USN) is heavily reliant on its ability to operate aircraft in the maritime environment. Done successfully, shipboard flight operations allow air-capable ships to act as mobile airfields, ensuring the USN's ability to maintain freedom of the seas. Typically rotary-wing aircraft land at the stern of USN surface vessels (i.e., a guided missile destroyer (DDG)). Ship movement creates turbulence induced by its superstructure, which may produce unfavorable conditions for rotary-wing aircraft just after takeoff and just before recovery. This ship-aircraft interplay is termed dynamic interface (DI). With the growing prominence of uncrewed aerial systems, the USN deems characterizing the DI a crucial step towards employing these systems from air-capable ships. The United States Naval Academy operates a fleet of 108 ft Yard Patrol Craft tasked with training future naval officers. One of these ships has been modified such that the air wake models a DDG to the 1/4 scale. This research documents the DI tests conducted with a remote-piloted drone through mission representative recoveries to the modified Yard Patrol Craft. While operating in the terminal area, the pilot assessed their workload via a modified Cooper Harper scale.

关键词： Training Sea surface Missiles Correlation Land surface Military aircraft Marine vehicles

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Tracking Additive Manufacturing Using Machine Vision 10

Tracking Additive Manufacturing Using Machine Vision

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10th IEEE International Conference on "Nanomaterials: Applications and Properties", NAP 2020

作者： Davis Iv, Lenning A. Donnal, John S. Kutzer, Michael D. M. United States Naval Academy Annapolis Department of Weapons Robotics and Control Engineering United States

ISBN: (纸本)9781728185064

This paper presents a method of vision-based trajectory reconstruction for additive manufacturing (AM). With the rise in popularity of AM comes severe cyber-physical risks. Towards addressing this issue, this paper presents a method of reconstructing printhead motion with a minimally invasive camera module retrofit. A feature based Visual Odometry (VO) algorithm is used to estimate the relative motion of the extruder, leveraging expanded methods from the MATLAB Computer Vision Toolbox. Preliminary results in simulation demonstrate feasibility of the proposed VO method and identify factors that may limit performance. Further, a hardware implementation is demonstrated on a retrofitted LulzBot TAZ6, as well as novel methods to improve feature-based VO performance. © 2020 IEEE.

关键词： Computer vision

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Wavefront Characterization of a Gaussian Beam after Propagation through Optical Turbulence Generated by Rayleigh-Bénard Convection

Wavefront Characterization of a Gaussian Beam after Propagat...

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2023 Conference on Lasers and Electro-Optics, CLEO 2023

作者： O'Malley, Owen M. Avramov-Zamurovic, Svetlana Ferlic, Nathaniel A. Mullen, Linda J. Judd, K. Peter Weapons Robotics and Control Engineering Department United States Naval Academy Hopper Hall 597 McNair Rd AnnapolisMD21402 United States 22347 Cedar Point Road Patuxent RiverMD20670 United States United States Naval Research Laboratory 4555 Overlook Ave. SW WashingtonDC203 75 United States

A Gaussian beam is propagated through a water tank containing Rayleigh-Benard convection. The beam wavefront is measured using a Shack-Hartmann sensor to obtain optical wavefront statistics for characterization of the... 详细信息

ISBN: (纸本)9781957171258

关键词： Gaussian beams

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Temporal Statistics of Synced Optical Phase and Intensity Measurements through Rayleigh Bénard Turbulence 12

Temporal Statistics of Synced Optical Phase and Intensity Me...

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Laser Communication and Propagation through the Atmosphere and Oceans XII 2023

作者： Ferlic, Nathaniel A. Avramov-Zamurovic, Svetlana O’Malley, Owen Mullen, Linda J. Judd, K. Peter Naval Air Warfare Center Aircraft Division 22347 Cedar Point Road Patuxent RiverMD20670 United States Weapons Robotics and Control Engineering Department United States Naval Academy 597 McNair Rd. Hopper Hall AnnapolisMD21402 United States United States Naval Research Laboratory 4555 Overlook Ave. SW WashingtonDC20375 United States

ISBN: (纸本)9781510665965

Optical applications, such as imaging, communications, and sensing, can be severely limited by the effects of oceanic turbulence when the water is free of particulate matter. To study this phenomenon in a controlled environment, a Rayleigh Bènard tank, housed at the U.S. Naval Academy, was used to study heat driven convective turbulence in a systemic manner. A Gaussian laser beam was characterized though synchronized phase and intensity measurements obtained by a Shack-Hartmann wavefront sensor and high-speed camera, respectively. The beam’s instantaneous intensity and phase measurements were analyzed in space and time, and the synchronicity between the wavefront sensor and camera allows for the temporal statistics to be directly compared. Phase time series were analyzed to obtain an ensemble averaged power spectrum that was fit to a bounded Kolmogorov model. Wavelet analysis was leveraged to process the turbulence frequency rates at weak and moderate turbulence levels. Estimates for the turbulence turnover rates were obtained from the temporal statistics. Upon applying the same methods to the intensity time series, the statistics appeared subtly different compared to the phase statistics. It was shown within the wavefront frequency statistics that features changed on the time scale of seconds. However, intensity features changed on timescales of seconds to a tenth of a second. © 2023 SPIE.

关键词： Computational complexity

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