Gravitational Detection of Submarines
Technical Report,02 Oct 1989,02 Oct 1989
Pacific-Sierra Research Corporation Warminster United States
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Because a submarine usually operates in a condition of nearly neutral buoyancy, its overall mass including ballast is nearly equal to the mass of water it displaces. Accordingly, a submarine produces no first order gravitational anomaly. However, in the interest of stability, a submarine is designed such that its center of mass is located below its center of buoyancy, thus giving rise to a net vertical gravitational dipole moment and a concomitant gravitational field anomaly. This report calculates gravitational signals and the possibility of detecting them by an airborne gravimeter or gravity gradiometer. It concludes that militarily useful ranges are not achievable.