Determination of the Gravity Disturbance on the Earth's Topographic Surface from Airborne Gravity Gradient Data
OHIO STATE UNIV COLUMBUS DEPT OF GEODETIC SCIENCE AND SURVEYING
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The test flight of the gravity gradiometer survey system was taken in a flat area. In the future the test will be carried out in the rough mountain area and the topographic effect has to be taken into account. In this report the analytical downward continuation method was used to determine the gravity disturbance on the earths topographic surface. The downward continuation is an improperly posed problem, especially in the processing of the aerial gradient data. In order to overcome this difficulty, three methods were discussed and were used for a simulated computation. The numerical computation shows that the gravity disturbance can be determined on the earths surface with satisfied accuracy. With 1 Eotvos measure error in the gravity gradient data, the gravity disturbance was determined on the earths surface with the accuracy of 1 mgal. The gravity disturbance was recovered with the accuracy of 3 mgal when the measure error of the gravity gradient was 5 Eotvos. Keywords Gravity Gradiometer Downward Continuation.