Exploitation of a ship's magnetic field signatures

• Main Author: Holmes, John J.
• Format: Electronic
• Language: English
• Published: San Rafael, Calif. (1537 Fourth Street, San Rafael, CA 94901 USA) : Morgan & Claypool Publishers, c2006.
• Edition: 1st ed.
• Series: Synthesis lectures on computational electromagnetics (Online), #9.
• Subjects: Magnetic fields.; Magnetism of ships.; Submarine mines.; Submarines (Ships); Underwater surveillance.
• Online Access: View fulltext via EzAccess
• Item Description: Part of: Synthesis digital library of engineering and computer science.; Title from PDF t.p. (viewed on Oct. 19, 2008).; Series from website.
• Physical Description: 1 electronic text (ix, 67 p. : ill. (some col.)) : digital file.; Also available in print.
• Format: Mode of access: World Wide Web.; System requirements: Adobe Acrobat Reader.
• Bibliography: Includes bibliographical references.
• ISBN: 1598290754 (electronic bk.); 9781598290752 (electronic bk.); 1598290746 (pbk.); 9781598290745 (pbk.)
• ISSN: 1932-1716
• Access: Abstract freely available; full-text restricted to subscribers or individual document purchasers.

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.