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<p>The Navy and Marine Corps' Forward . . . 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.S. forces and an  effective force multiplier for the Fleet. The Navy/Marine Corps must have efficient Mine  Warfare (MIW) forces to ensure the Fleet can carry out operations in the open ocean and  littorals, including maintaining open sea lanes of communication and supporting Ship-to-  Objective Maneuver Warfare from the Sea while denying operating areas to the enemy.  Every ship has a magnetic signature, which is caused by its iron and steel  components. Additionally, the earth's natural magnetic field induces a magnetization in a  ship depending on its latitude, longitude, and heading. Exploitation of surface ship and  submarine magnetic field signatures by naval influence mines has occurred throughout  time. In order to calculate the swept path width for magnetic minesweeping systems  currently in use by the U.S. Mine Warfare (MIW) forces, it is necessary to calculate the  vector components of the magnetic field strength which are generated by each of several  possible system configurations. The Navy's Magnetic Model addresses this needed  capability.  The Navy's N-Layer Magnetic Model (NLMM) is used to predict the expected  performance of magnetic minesweeping equipment in a complex environment consisting  of N layers, each with arbitrary conductivity and thickness. The model is used to compute  the magnetic field strength produced by various U.S. Navy magnetic minesweeping  configurations using a random environmental vertical conductivity structure. To better  determine which parameters had the greatest effect on the model, and which could be  simplified or enhanced, a series of tests were run on actual data sets.
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<br>Subjects: Oceanography; Sound</div>
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Poteete, Sam</div>
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