Predicting Magnetic Signature Of A Ship Using Shipboard Sensors
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Predicting Magnetic Signature Of A Ship Using Shipboard Sensors
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Author : Kevin S. Mooney
language : en
Publisher:
Release Date : 1991
Predicting Magnetic Signature Of A Ship Using Shipboard Sensors written by Kevin S. Mooney and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Magnetism of ships categories.
Reduction Of A Ship S Magnetic Field Signatures
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Author : John Holmes
language : en
Publisher: Morgan & Claypool Publishers
Release Date : 2008-10-08
Reduction Of A Ship S Magnetic Field Signatures written by John Holmes and has been published by Morgan & Claypool Publishers this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008-10-08 with Technology & Engineering categories.
Decreasing the magnetic field signature of a naval vessel will reduce its susceptibility to detonating naval influence mines and the probability of a submarine being detected by underwater barriers and maritime patrol aircraft. Both passive and active techniques for reducing the magnetic signatures produced by a vessel's ferromagnetism, roll-induced eddy currents, corrosion-related sources, and stray fields are presented. Mathematical models of simple hull shapes are used to predict the levels of signature reduction that might be achieved through the use of alternate construction materials. Also, the process of demagnetizing a steel-hulled ship is presented, along with the operation of shaft-grounding systems, paints, and alternate configurations for power distribution cables. In addition, active signature reduction technologies are described, such as degaussing and deamping, which attempt to cancel the fields surrounding a surface ship or submarine rather than eliminate its source. Table of Contents: Introduction / Passive Magnetic Silencing Techniques / Active Signature Compensation / Summary
Exploitation Of A Ship S Magnetic Field Signatures
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Author : John J. Holmes
language : en
Publisher: Morgan & Claypool Publishers
Release Date : 2006-12-01
Exploitation Of A Ship S Magnetic Field Signatures written by John J. Holmes and has been published by Morgan & Claypool Publishers this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006-12-01 with Technology & Engineering categories.
Surface ship and submarine magnetic field signatures have been exploited for over 80 years by naval influence mines, and both underwater and airborne surveillance systems. The generating mechanism of the four major shipboard sources of magnetic fields is explained, along with a detailed description of the induced and permanent ferromagnetic signature characteristics. A brief historical summary of magnetic naval mine development during World War II is followed by a discussion of important improvements found in modern weapons, including an explanation of the damage mechanism for non-contact explosions. A strategy for selecting an optimum mine actuation threshold is given. A multi-layered defensive strategy against naval mines is outlined, with graphical explanations of the relationships between ship signature reduction and minefield clearing effectiveness. In addition to a brief historical discussion of underwater and airborne submarine surveillance systems and magnetic field sensing principles, mathematical formulations are presented for computing the expected target signal strengths and noise levels for several barrier types. Besides the sensor self-noise, equations for estimating geomagnetic, ocean surface wave, platform, and vector sensor motion noises will be given along with simple algorithms for their reduction.
Reduction Of A Ship S Magnetic Field Signatures
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Author : John Holmes
language : en
Publisher: Springer Nature
Release Date : 2022-06-01
Reduction Of A Ship S Magnetic Field Signatures written by John Holmes and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-06-01 with Technology & Engineering categories.
Decreasing the magnetic field signature of a naval vessel will reduce its susceptibility to detonating naval influence mines and the probability of a submarine being detected by underwater barriers and maritime patrol aircraft. Both passive and active techniques for reducing the magnetic signatures produced by a vessel's ferromagnetism, roll-induced eddy currents, corrosion-related sources, and stray fields are presented. Mathematical models of simple hull shapes are used to predict the levels of signature reduction that might be achieved through the use of alternate construction materials. Also, the process of demagnetizing a steel-hulled ship is presented, along with the operation of shaft-grounding systems, paints, and alternate configurations for power distribution cables. In addition, active signature reduction technologies are described, such as degaussing and deamping, which attempt to cancel the fields surrounding a surface ship or submarine rather than eliminate its source. Table of Contents: Introduction / Passive Magnetic Silencing Techniques / Active Signature Compensation / Summary
Prediction Of The Magnetic Field Beyond The Array Of Sensors
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Author : Rungkiet Kamondetdacha
language : en
Publisher:
Release Date : 2003
Prediction Of The Magnetic Field Beyond The Array Of Sensors written by Rungkiet Kamondetdacha and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Detectors categories.
The objective of this work was to develop a method to predict the magnetic field around a magnetic source. This knowledge is useful for developing a way to reduce the magnetic signature. A marine vessel is an example of a magnetic source for which magnetic silencing is desired. Because of the shape of the vessel, the work focuses on the prediction of the field due to an elongated magnetic source. The set of harmonic-expansion coefficients of magnetic scalar potential or so-called magnetic multipole image is used for characterization of a magnetic source. The multipole image of the source is restored by application of selective functions to the measured magnetic fields obtained from magnetic sensors located in the vicinity of the source. The magnetic field beyond the sensor array can then be predicted from the restored multipole image. Five standard sources were used to create the fields. Prolate spheroidal array, cylindrical array, circular planar array, and rectangular planar sensor arrays were tested. A virtual array created by a movement of a ship over a line of sensors was also tested with a simplified model of ship dynamics. Non-idealities in localization, orientation of the sensors, and noise were included in the tests in order to simulate the real measurement environment. Under a noisy environment, the selective function method worked well for all arrays, except for rectangular array which was sensitive to the noise. A Truncated Singular Value Decomposition method was developed to reduce this sensitivity and it yielded a more accurate field prediction under a noisy environment.
Exploitation Of A Ship S Magnetic Field Signatures
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Author : John Holmes
language : en
Publisher: BoD - Books on Demand
Release Date : 2024-02-15
Exploitation Of A Ship S Magnetic Field Signatures written by John Holmes and has been published by BoD - Books on Demand this book supported file pdf, txt, epub, kindle and other format this book has been release on 2024-02-15 with Science categories.
"Exploitation of a Ship’s Magnetic Field Signatures" by John Holmes is a groundbreaking exploration of naval technology and strategic warfare. Holmes delves into the intricate realm of magnetic field signatures emanating from ships, unraveling their implications for military operations and defense systems. The book meticulously examines how adversaries can exploit these magnetic signatures for tactical advantage or to devise countermeasures. Holmes, with authoritative expertise, offers insights into the implications for naval tactics, submarine warfare, and the development of magnetic signature mitigation technologies. This work stands as an indispensable guide for naval professionals, defense analysts, and technology enthusiasts, providing a thorough understanding of the nuanced interplay between magnetic fields and maritime security. As a seminal contribution to the field, Holmes' work navigates the complex waters of magnetic signature exploitation, making it a must-read for anyone seeking a deeper comprehension of naval strategy and modern defense mechanisms.
Modeling A Ship S Ferromagnetic Signatures
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Author : John Holmes
language : en
Publisher: Springer Nature
Release Date : 2022-05-31
Modeling A Ship S Ferromagnetic Signatures written by John Holmes and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-05-31 with Technology & Engineering categories.
Ferromagnetic models of ships and submarines that predict or reproduce their magnetic signatures have found applications in the development of both offensive and defensive military systems from World War II to the present. The mathematical basis of generalized coordinate systems will be presented and demonstrated with example applications to analytic spherical and prolate spheroidal magnetic ship models. In addition, the advantages and pitfalls of using complex finite-element- and boundary-element numerical techniques to predict high-order near-field ship signatures will be discussed, followed by a short description of the design and testing of complementary physical scale models. Extrapolation of measured magnetic signatures from testing environments to threat areas using semi-empirical math models will be presented, along with an explanation of their inherent instabilities and methods for regularizing them. These magnetic ship signature modeling techniques are used today in designing optimized signature reduction systems that have a minimum impact on ships and their systems. The discussion will be closed with an important discussion of the verification and validation of magnetic models of surface ships and submarines.
Ship Sensors
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Author : R. Glenn Wright
language : en
Publisher: Taylor & Francis
Release Date : 2024-02-29
Ship Sensors written by R. Glenn Wright and has been published by Taylor & Francis this book supported file pdf, txt, epub, kindle and other format this book has been release on 2024-02-29 with Transportation categories.
When combined with artificial intelligence, advanced computing architectures and enhanced communications, sensor technologies can monitor vessel performance and the adjacent environment to detect conditions that may hinder voyage completion. This book provides insight into the present and future of sensor architectures and configurations that can enhance vessel performance and further improve the safety of navigation. It covers topics such as traditional and expanded sensor functions in engineering and navigation, as well as new sensor capabilities that can provide greater insight into vessel behavior and performance and enhance awareness of passenger, crew and other human activities. Chapters offer background information on typical legacy vessel sensor configurations and current International Maritime Organization (IMO) requirements for onboard sensors and future regulatory trends before discussing modern sensors and current- generation “smart” sensors that provide enhanced situational awareness to watchstanders. A vision of next- generation sensors currently being investigated for shipboard use is provided along with long- term trends in quantum sensing and computing that promise radical change across a wide variety of vessel functions. Insight is also given into cybersecurity factors so essential to all sensor systems. Ship Sensors: Conventional, Unmanned and Autonomous is ideal for professional seafarers, maritime academics and university students, and developers of maritime sensors and systems.
Shipboard Application Of Infrared Signature Suppression Technologies
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Author : Av Satyanarayana Murty
language : en
Publisher: Mohammed Abdul Sattar
Release Date : 2024-02-27
Shipboard Application Of Infrared Signature Suppression Technologies written by Av Satyanarayana Murty and has been published by Mohammed Abdul Sattar this book supported file pdf, txt, epub, kindle and other format this book has been release on 2024-02-27 with Nature categories.
In the vast blue ocean, ships of different navies operate far from each other and are generally not in visual range. However, a ship can be uniquely identified based on a number of emissions that are characteristic to each and are called signatures. These include acoustic signature from machinery and flow, heat or infrared signature from exhaust, radar cross section from hull surfaces, magnetic signature from hull material, electric signature from corrosion protection systems etc. These signatures are used by surveillance and tracking sensors for attacking ships in general and warships, in particular. Survivability at sea requires management of all platform signatures to produce a net effect of reduced vulnerability. Anti-ship missiles pose the greatest threat to ships at sea. Prior to the Second World War, studies were carried out in parallel on the use of radar and infrared seekers in missiles for detection, identification and homing. For the materials available in the 1940s, radar seekers gave better results and hence, have become the standard fit. Over the years, advances in material sciences have improved the capabilities of infrared seekers and today, missiles have several guidance/seeker options that include radar, electro- optical camera and infrared imaging. Infrared homing is preferred for terminal guidance because of its inherent immunity to jamming techniques. A stealthy naval platform remains undetected and therefore can be deployed closer to the target to fulfill its mission with lesser risk of damage and associated causalities. Signatures used for ship detection include both underwater and above water. Signatures used by underwater weapons like torpedoes and mines are acoustics, magnetics, wake homing and extremely low frequency emissions (ELFE). Anti-ship missiles use above water signatures that include laser cross section (LCS), radar cross section (RCS), air borne noise and infrared (IR).
Field Measurement Of Surface Ship Magnetic Signature Using Multiple Auvs
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Author :
language : en
Publisher:
Release Date : 2009
Field Measurement Of Surface Ship Magnetic Signature Using Multiple Auvs written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.
An effort has been initiated to develop a portable system capable of measuring the magnetic signature of a surface ship. The system will employ a formation of multiple AUVs, each equipped with a magnetometer. The objective is to measure total magnetic field at specified locations relative to the surface ship. In the first step of system development, an Autonomous Underwater Vehicle (AUV) has been equipped with a tri-axial fluxgate magnetometer and used to perform preliminary magnetic field measurements. Measurements of this type will be used to calibrate an individual AUV/magnetometer system. Initial measurements appear to meet necessary measurement requirements on noise floor as the standard deviation of the indicated total magnetic field was observed to be 21nT while the AUV proceeded on a straight, level path. Extended Kalman Filters (EKF) are being developed for on-board AUV navigation and post-processing a best estimate for AUV vehicle position. Navigation experiments were conducted to evaluate AUV navigation and position estimation. In these experiments, an independent high-accuracy topside-track system was used to provide ground-truth for comparison. The average error in the on-board estimated position of the AUV used for navigation was 1.84m. The post processing EKF was designed to use all available sensor data. This EKF had an average position error of 0.74m when compared to the ground-truth. Overall, the AUV was able to navigate to an average distance of 1.95m from its desired waypoint track.