A local analysis method of marine gravity aided navigation area

Because gravity matching accuracy is associated with local navigation area characteristics and carrier's heading, so we firstly calculate the local characteristic of gravity field and select navigation areas, then extract the skeleton of them with fast Euclidean distance field algorithm and skeleton simplified algorithm. So the carrier can select heading according to the statistical characteristics of local areas formed by the skeleton points and their Euclidean distance. The simulation result verifies the validity of the analysis method.