Abstract:Gravity matching navigation precision is affected by the selection of gravity adaptive region. To effectively select the optimal adaptive area, we use the single feature criterion of information entropy and the multi feature criterion of multi-attribute decision making to evaluate the adaptability of gravity base map. Firstly, we select gravity standard deviation, correlation coefficient, roughness and gradient, gravity feature abundance and mean cumulative gradient parameters. Secondly, we screen the adaptive and non-adaptive regions in the same sea area using single/multi feature criteria, and verify gravity matching navigation by terrain contour matching(TERCOM) algorithm. Finally, we compare and analyze the matching navigation accuracy of the two methods. The results show that the mismatch rate of single feature criterion in the adaptive/non-adaptive regions is 30% and 20%, respectively. There is no obvious mismatch of multi feature criterion in the adaptive area, and the error is several hundred meters, while there are many mismatches in the non-adaptive area. The results indicate that multi feature analysis criterion can accurately and effectively evaluate the adaptability of gravity matching region compared with single feature analysis criterion.