Download or read book Acoustic Positioning of the NPS Autonomous Underwater Vehicle AUV II During Hover Conditions written by Kevin A. Torsiello and published by . This book was released on 1994 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ability to take position, in a dynamic environment, relative to a local stationary object, is vital to many planned missions for the Naval Postgraduate School's Autonomous Underwater Vehicle (AUV II) project, such as bottom surveying and mine hunting. The AUV II can achieve this ability through the use of its sensors along with stem propulsion motors and tunnel thrusters. The sensors employed by the AUV II include a free directional gyro and independent self-sonar which provide acoustic positioning data without the aid of a transponder net. Described in this thesis are the details of the internal subsystems of the AUV II, and an examination of its positioning ability through the analysis of maneuvering experiments. Commanded motions of yaw, lateral and longitudinal positioning during hover conditions are studied.
Download or read book Acoustic Positioning of the NPS Autonomous Underwater Vehicle AUV II During Hover Conditions written by Kevin A. Torsiello and published by . This book was released on 1994 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ability to take position, in a dynamic environment, relative to a local stationary object, is vital to many planned missions for the Naval Postgraduate School's Autonomous Underwater Vehicle (AUV II) project, such as bottom surveying and mine hunting. The AUV II can achieve this ability through the use of its sensors along with stem propulsion motors and tunnel thrusters. The sensors employed by the AUV II include a free directional gyro and independent self-sonar which provide acoustic positioning data without the aid of a transponder net. Described in this thesis are the details of the internal subsystems of the AUV II, and an examination of its positioning ability through the analysis of maneuvering experiments. Commanded motions of yaw, lateral and longitudinal positioning during hover conditions are studied.
Download or read book Proceedings of the Technology and the Mine Problem Symposium written by Albert M. Bottoms and published by . This book was released on 1996 with total page 756 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthetic Jets written by Kamran Mohseni and published by CRC Press. This book was released on 2014-09-17 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt: Compiles Information from a Multitude of SourcesSynthetic jets have been used in numerous applications, and are part of an emergent field. Accumulating information from hundreds of journal articles and conference papers, Synthetic Jets: Fundamentals and Applications brings together in one book the fundamentals and applications of fluidic actuators.
Download or read book Acoustic Underwater Navigation of the Phoenix Autonomous Underwater Vehicle Using the Divetracker System written by Arthur W. Scrivener and published by . This book was released on 1996-03-01 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: Autonomous Underwater Vehicles (AUVs) require a navigation system in order to conduct useful functions. This research was an experimental investigation of the commercial DiveTracker underwater acoustic navigation system used onboard the NPS Phoenix AUV. Tests conducted with the DiveTracker system proved that the system could be used successfully in AUV navigation while submerged and revealed that more precise positioning could be obtained through postconditioning of the DiveTracker output ranges, rather than prefiltering.
Download or read book Autonomous Underwater Vehicles written by Jing Yan and published by Springer Nature. This book was released on 2021-11-01 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt: Autonomous underwater vehicles (AUVs) are emerging as a promising solution to help us explore and understand the ocean. The global market for AUVs is predicted to grow from 638 million dollars in 2020 to 1,638 million dollars by 2025 – a compound annual growth rate of 20.8 percent. To make AUVs suitable for a wider range of application-specific missions, it is necessary to deploy multiple AUVs to cooperatively perform the localization, tracking and formation tasks. However, weak underwater acoustic communication and the model uncertainty of AUVs make achieving this challenging. This book presents cutting-edge results regarding localization, tracking and formation for AUVs, highlighting the latest research on commonly encountered AUV systems. It also showcases several joint localization and tracking solutions for AUVs. Lastly, it discusses future research directions and provides guidance on the design of future localization, tracking and formation schemes for AUVs. Representing a substantial contribution to nonlinear system theory, robotic control theory, and underwater acoustic communication system, this book will appeal to university researchers, scientists, engineers, and graduate students in control theory and control engineering who wish to learn about the core principles, methods, algorithms, and applications of AUVs. Moreover, the practical localization, tracking and formation schemes presented provide guidance on exploring the ocean. The book is intended for those with an understanding of nonlinear system theory, robotic control theory, and underwater acoustic communication systems.
Download or read book Design and Evaluation of a Differential Global Positioning System DGPS for the NPS Autonomous Underwater Vehicle AUV written by Gwladys Piton and published by . This book was released on 1999-08-01 with total page 81 pages. Available in PDF, EPUB and Kindle. Book excerpt: Accurate underwater positioning remains an important challenge to AUV researchers. Recent development of Differential Global Positioning System (DGPS) embedded in an AUV proved the capability of DGPS fixes to reduce the position error. By surfacing regularly, the AUV takes DGPS fixes and integrates them for position estimation. The purpose of this study is to develop a low-cost DGPS for the NPS AUV. To match mission requirements, the system is designed such that the differential receiver and the GPS receiver are two independent stations using radio modems to communicate. Local experimental testing showed that this system can yield positions within one to five meters accuracy.
Download or read book Design and Implementation of a Collision Avoidance System for the NPS Autonomous Underwater Vehicle AUV II Utilizing Ultrasonic Sensors written by Charles Alan Floyd and published by . This book was released on 1991 with total page 121 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Oceans 95 written by and published by . This book was released on 1995 with total page 774 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book AUV Localization in an Underwater Acoustic Positioning System written by Dugald Thomson and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis develops a Bayesian inversion algorithm for autonomous underwater vehicle localization, and carries out a study of several factors contributing to localization accuracy in an underwater acoustic positioning system. Specifically, a ray-based algorithm is described that estimates target position through the linearized inversion of transmission arrival time differences, and provides linearized uncertainty estimates for model parameters. Factors contributing to source localization uncertainty considered here included: (1) modelling transmission paths accounting for refraction due to a depth-varying SSP instead of using a constant sound-speed approximation and straight-line propagation, (2) inverting for a potential bias in the measured sound-speed profile, (3) accounting for errors in hydrophone position by including these positions as unknown parameters in the inversion, and (4) applying path-dependent timing correction factors to account for lateral variability in the sound-speed profile. In each case, nonlinear Monte Carlo analysis is applied in which a large number of noisy data sets are considered, to obtain statistical measures of the localization improvement that results by addressing these factors.
Download or read book A Conceptual Design Study of a Hovering System Controller for an Autonomous Underwater Vehicle written by Chris. A. Thompson and published by . This book was released on 1987 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: An Autonomous Underwater Vehicle (AUV) will have many operational scenarios that will include a transition from cruise to hover over a fixed position in the ocean. While hovering, the AUV must be able to balance the current induced forces a difficult task to accomplish automatically. The magnitude of these forces induced on an example AUV have been estimated for currents from 4 m/s to 1 m/s with the incident current varying from 0 deg to 360 deg. Using the estimated forces, different configurations of thrusters were investigated and the power required for different thruster configurations compared. Three thrusters (two longitudinal, one lateral) can balance the forces exactly and a unique solution was evaluated. With redundant thrusters, more economical schemes can developed using force allocation logic with minimum norm solutions. System horsepower requirements have been estimated and a conceptual model based controller methodology has been proposed. The force allocation logic proposed will now allow for a smooth transition from cruise to hover mode positions. Keywords: Theses; Stationkeeping.
Download or read book Government Reports Annual Index written by and published by . This book was released on 1994 with total page 1692 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Design of a Hover Mode Autopilot for the Phoenix Autonomous Underwater Vehicle written by Juan Cesar Gonzalez and published by . This book was released on 1995 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: The potential uses for autonomous underwater vehicles (AUV's) is gaining recognition by organizations world wide. As such, continuous research toward improving existing vehicles by seeking new designs and increasing efficiency is being funded by organizations that serve to benefit from the new technology. Some examples for which AUV's may be used include mine countermeasures, submerged structural repair or destruction, search and rescue, biological study, ocean floor and coastal survey. The goal of this thesis is to design an autopilot that will use a combination of both vertical thrusters, both horizontal thrusters, and the main screws simultaneously to control the NPS phoenix AUV's posture during hovering conditions and short transits. The control design is implemented and simulated using Common LISP object oriented programming language. The results of this thesis are favorable. Since this thesis presents only a basic approach to an autopilot design, it is believed by the author that with further improvements to the design presented, the existing hover made autopilot can eventually be upgraded with the resulting autopilot design. This upgrade would greatly increase the autopilots efficiency. (AN).
Download or read book Development and Testing of Navigation Algorithms for Autonomous Underwater Vehicles written by Francesco Fanelli and published by Springer. This book was released on 2019-04-16 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on pose estimation algorithms for Autonomous Underwater Vehicles (AUVs). After introducing readers to the state of the art, it describes a joint endeavor involving attitude and position estimation, and details the development of a nonlinear attitude observer that employs inertial and magnetic field data and is suitable for underwater use. In turn, it shows how the estimated attitude constitutes an essential type of input for UKF-based position estimators that combine position, depth, and velocity measurements. The book discusses the possibility of including real-time estimates of sea currents in the developed estimators, and highlights simulations that combine real-world navigation data and experimental test campaigns to evaluate the performance of the resulting solutions. In addition to proposing novel algorithms for estimating the attitudes and positions of AUVs using low-cost sensors and taking into account magnetic disturbances and ocean currents, the book provides readers with extensive information and a source of inspiration for the further development and testing of navigation algorithms for AUVs.
Download or read book Proceedings of the 1992 Symposium on Autonomous Underwater Vehicle Technology June 2 and 3 1992 Washington DC USA written by Oceanic Engineering Society (U.S.) and published by . This book was released on 1992 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government Reports Announcements Index written by and published by . This book was released on 1996-07 with total page 676 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Design of a Hover Mode Autopilot for the Phoenix Autonomous Underwater Vehicle written by and published by . This book was released on 1995 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: The potential uses for autonomous underwater vehicles (AUV's) is gaining recognition by organizations world wide. As such, continuous research toward improving existing vehicles by seeking new designs and increasing efficiency is being funded by organizations that serve to benefit from the new technology. Some examples for which AUV's may be used include mine countermeasures, submerged structural repair or destruction, search and rescue, biological study, ocean floor and coastal survey. The goal of this thesis is to design an autopilot that will use a combination of both vertical thrusters, both horizontal thrusters, and the main screws simultaneously to control the NPS Phoenix AUV's posture during hovering conditions and short transits. The control design is implemented and simulated using Common LISP object oriented programming language. The results of this thesis are favorable. Since this thesis presents only a basic approach to an autopilot design, it is believed by the author that with further improvements to the design presented, the existing hover made autopilot can eventually be upgraded with the resulting autopilot design. This upgrade would greatly increase the autopilots efficiency. (AN).
