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This paper discusses a novel approach for detecting moving massive objectsbased on the time variation that these objects produce in the localgravitational field measured by several detectors. Such an approach may providea viable method for detecting stealth aircraft, UAVs, cruise, and ballisticmissiles. By inverting a set of nonlinear algebraic equations, it is possibleto use the time variation in the gravitational fields to compute the mass,position, and velocity of one or more moving objects. The approach isessentially a gravity-based form of triangulation. Based on order-of-magnitudecalculations, we estimate that under realistic scenarios, this approach will befeasible if it is possible to design gravimetric devices that are four to fiveorder of magnitude more sensitive than current devices. To achieve such a levelof sensitivity, we suggest designing detectors that exploit aquantum-mechanical effect known as gravity-induced quantum interference.Furthermore, even if we have a perfect detector, it will be necessary todetermine the magnitude of various atmospheric disturbances and other sourcesof noise.

Gravimetric Radar: Gravity-Based Detection of a Point-Mass Moving in a Static Background