Exploitation of a ship s magnetic field signatures holmes john j. Exploitation of A Ship's Magnetic Field Signatures 2019-03-21

Exploitation of a ship s magnetic field signatures holmes john j Rating: 5,6/10 217 reviews

IEEE Xplore

exploitation of a ship s magnetic field signatures holmes john j

Also, a conductivity-difference environment is set for the interface influence. Equations for estimating geomagnetic, ocean surface wave, platform, and vector sensor motion noises are presented along with simple algorithms for their reduction. Publisher's Summary 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. This is followed by a brief historical discussion of underwater and airborne submarine surveillance systems and magnetic field sensing principles, in which mathematical formulations are presented for computing expected target signal strengths and noise levels for several barrier types. Exploitation of magnetic signatures by naval mines 3. We developed a new data-collection protocol and performed it under 11 different scenarios to observe and measure the radiation emissions from all of the transmitters.

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Reduction of a ship's magnetic field signatures [electronic resource] in SearchWorks catalog

exploitation of a ship s magnetic field signatures holmes john j

We assume the reader is familiar with the basic principles of classical electrodynamics and optics. 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. Emulation sweeping provides an effective stand-alone minecounter measures technique as well as an essential complement to minehunting operations. Our final conclusion is that it appears to be feasible to design and build underwater communications using optical classical and quantum channels secured with quantum key distribution protocols. Corrosion damage is a major factor in ship maintenance and availability.

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Morgan & Claypool Publishers

exploitation of a ship s magnetic field signatures holmes john j

Naval ships are particularly required to maintain acoustic and magnetic silence due to their operational characteristics. 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 this volume, 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. 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. As such, it is critical to have a robust and secure communication system connecting underwater vehicles on a long seaborne mission and a ground station. Recent developments in computer simulation techniques based on the boundary element method have enabled the electric fields generated by the galvanic interaction of the ship metallic structure and the sea water to be predicted.

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(PDF) Management of Naval Vessel's Electromagnetic Signatures: A Review of Sources and Countermeasures

exploitation of a ship s magnetic field signatures holmes john j

From the Sea strategic concept has expanded naval operations from open ocean, blue-water combat environments to the littoral regions in which naval mines can both be an extremely menacing threat to U. 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. 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. Go to our Resources and Help section for instructions on. Also outlined is a multi-layered defensive strategy against naval mines, with graphical explanations of the relationships between ship signature reduction and minefield clearing effectiveness.

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Reduction of a Ship's Magnetic Field Signatures by John J. Holmes

exploitation of a ship s magnetic field signatures holmes john j

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. 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. Access Abstract freely available; full-text restricted to subscribers or individual document purchasers. Further moves toward Taiwan's independence during President Chen's second term, such as rewriting the constitution, may very well lead to another Taiwan Strait crisis. 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. The hardness of heat-treated Al-5.

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Reduction of a Ship's Magnetic Field Signatures

exploitation of a ship s magnetic field signatures holmes john j

In this paper, we provide a new data collection model for future surveys, which could be conducted with larger samples to verify our observations. Among them, underwater magnetic field signals derived by ships are likely to be detected by threats such as surveillance systems and mine systems at close distance. This analysis does not include U. Equations for estimating geomagnetic, ocean surface wave, platform, and vector sensor motion noises are presented along with simple algorithms for their reduction. Submarine barriers using total field magnetometers 5. And the optimum degaussing current of the coil was derived by applying the particle swarm optimization algorithm considering the gradient constraint.

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Exploitation of a ship's magnetic field signatures

exploitation of a ship s magnetic field signatures holmes john j

This paper provides a broad overview of the sources of, and countermeasures for eliminating, the electromagnetic signature of a vessel, as well as sensors capable of measuring the signature. The validity of the optimal degaussing technique is verified analytically by comparing the magnetic field signals after the degaussing with or without gradient constraint. Magnetic fields of naval vessels are widely used all over the world for detection and localization of naval vessel. Effective measures for electromagnetic signature management are required to protect vessels from being detectedby sea mines. Modern magnetic mine technologies 3. 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.

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Exploitation of A Ship’s Magnetic Field Signatures

exploitation of a ship s magnetic field signatures holmes john j

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. This paper provides a broad overview of underwater electromagnetic signaturesthat are produced by naval vessels. Other important sources of magnetic field 3. Format Mode of access: World Wide Web. The objective being to design the system to minimise the electric field while at the same time provide adequate protection. The model is used to compute the magnetic field strength produced by various U.

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