Gravity field approximation using airborne gravity gradiometer data

Physics

Scientific paper

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Airborne Equipment, Geodetic Surveys, Geopotential, Gravity Anomalies, Gravity Gradiometers, Computer Programs, Covariance, Fast Fourier Transformations, Gravitational Fields, Ground Tracks, Least Squares Method

Scientific paper

A set of airborne Gravity Gradiometer Survey System (GGSS) data was used in combination with the OSU89B geopotential model to predict gravity anomalies and deflections of the vertical. The gradiometer data were collected during an airborne survey of the GGSS in the Texas/Oklahoma area. A total of 19 flight tracks were available for analysis. These tracks resulted from 54 initial distinct tracks from which a processing was performed. In order to assess the quality of the GGSS measurements a first-crossover analysis was carried out. The results showed large discrepancies at the crossing points between east-west and north-south tracks. The least-squares collocation method and fast Fourier transform technique were used to produce gravity anomalies and deflections of the vertical referred to geoid surface from second-order derivatives measured at the flight level. The predicted gravity values were then compared to truth-based point-free air-gravity anomalies with a standard deviation of the differences at the level of 3 mGal in the best cases. The predicted deflections of the vertical were compared to truth-based values at a small number of ground stations.

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