Abstract
Typical samples of ship accelerations are used to examine errors in gravity measurement at sea. Ships experience large vertical (heave) accelerations that must be filtered out in order to obtain accurate measurements from a gravimeter mounted on a stabilized platform. Four heave filters designed to reduce such accelerations to <1 mgal while not affecting the gravity signals are examined. The off-leveling that depends on the erection loop of the gyro was also determined for most of the gyrostabilized platforms in use. Fourier analysis of sway and surge acceleration recorded aboard RV Vema and RV Robert D. Conrad were used in the determination.
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