Abstract
The effect of sinusoidal horizontal accelerations on the LaCoste and Romberg gravimeter platform was first formulated in detail using a flat earth approximation (LaCoste, 1967) for platform periods not exceeding 6 minutes. In response to user requirements for ever‐increasing accuracy, the platform period was increased gradually from 6 minutes in 1967 to 18 minutes by 1972 and, finally, to 84 minutes in 1977. Further motivation for incorporating long platform periods came from several aerial tests, both rotarywing (Gumert and Iverson, 1974) and fixed‐wing (Valliant, 1976) for which Schuler tuning appears particularly desirable. The introduction of azimuth stabilization in 1972 made the use of long periods possible without introducing transients after vehicle maneuvers. Current gravimeters are also equipped with switched damping to provide a user choice of no damping or damping set at 1/[Formula: see text]2 times critical damping. The preferred procedure is to operate the platform at the 84‐minute tuning with damping and to switch off the damping during turns. The effect of horizontal accelerations requires reevaluation in the light of these new conditions.
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