A model of the response of the MGS-6 gravity sensor to tilting

Abstract

The reliable interpretation of the measurements made by the Micro-g marine gravimetric system (MGS-6) depends on how the temporary changes of the scale coefficients such as gravimeter scale factor, vertical cross-coupling (VCC) effect, tiltmeter cross and tiltmeter long are compensated for during the signal analysis. The listed coefficients cannot be determined from readings during the measurements or by analysing the final data. The method presented here can be used to periodically check individual scale factors before starting shipborne measurements. This article focuses on determining the scale coefficients of the gravimeter: VCC effect, tiltmeter cross and tiltmeter long based on the MGS-6 gravity sensor's response to tilt. An unique non-linear model of Lacoste & Romberg gravimeter response to tilt was developed. In this paper, the measurement of the tilt angle of the object based on the photogrammetric elaboration of metric photographs is presented, using the principles of one-image photogrammetry.