Vertical deflection estimation device

Abstract

A vertical deflection estimation device usable for inertial navigation includes: a gravity gradiometer (10), a known vertical deflection library part (20), a high frequency extraction part (30), and an estimation part (40). The gravity gradiometer (10) measures vertical deflection in accordance with positional movement of the gravity gradiometer (10). The known vertical deflection library part obtains known coarse information of vertical deflection on map in accordance with the positional movement of the gravity gradiometer (10). The high frequency extraction part (20) extracts, from the measured vertical deflection, a high spatial frequency component of the measured vertical deflection. The estimation part (40) corrects the measured vertical deflection to derive estimated vertical deflection as highly accurate vertical deflection by combining the known coarse information of vertical deflection on map with the extracted high spatial frequency component of the measured vertical deflection.

Dependencies are inferred from the claim text.