FTG Theory
Introduction
The FTG system measures changes to the gravity vector components, the gradients or spatial rates of change, in the gravity field. Unlike a conventional gravimeter, which measures only the magnitude of the gravity field, the FTG system acquires data from all directions. The gravity tensor consists of nine components which can be mathematically arranged in a 3x3 matrix of partial derivatives. Of these nine tensor components, four are redundant, leaving only five independent components.
