Based on measured gravity anomaly and terrain data to determine the gravity gradients

Based on gravity anomaly data and terrain elevation data (DEM(9 '') and SRTM3(3 '')), this paper calculates the gravity gradients and its power spectral density of two profiles in West Arnhem Land of Australia's northern territory. We implement Remove-Recovery and Stokes integral method to obtain the outcomes. We also implement FFT methods to calculate the gravity gradients covering the entire area. The results show that combination of gravity anomaly data with high spatial resolution terrain elevation data can effectively improve the accuracy of gravity gradients. Calculated power spectral density matches well with the power spectral density model, it shows that power spectral density greater than 0.3 Hz can be regarded as noise. The results provide a reference for data processing in identifying and eliminating the noise in gradients. In addition, it provides beneficial exploration for reference map of gravity gradient assisted navigation and for gravity gradient measurement system calibration.