Densification algorithm research on gravity gradiometer reference map generation

Gravity gradient aided inertial navigation system is of a great significance for long-endurance passive automatic navigation. Under the circumstance that the actual gravity gradient data cannot be measured with the gradiometer, the map generation methods calculated by digital elevation model were researched. In order to generate high-resolution full-tensor gravity gradient maps, several densification algorithms, such as the Lagrange Interpolation Method, the Cubic Convolution Interpolation Method, the Improved Shepard Interpolation Method and the Radial Basis Function Interpolation Method were presented and compared.