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Satellite/airborne/ship-data-based construction of a high-accuracy marine gravity map

With the development of new underwater navigation technology, the passive navigation based on geophysical information is more and more realized by people, such as gravity, magnetism, topography. Gravity aided navigation is the localization technology of combination the stored gravity map and the gravity data measured in real time. One of the key technologies of Gravity aided navigation is to construct a high accuracy gravity map to meet the demands of navigation. The main gravity measurement manners are satellite altimetry, airborne gravity measurement and ship gravity measurement. These different ways have their own characteristic and adapt area, reflecting the different frequency gravity information. In order to construct a high accuracy gravity map, it is necessary to combine three kind data for the whole description of gravity. Thus, how to effective make a combination of these gravity information is important. In this paper, the basic idea of gravity aided navigation is briefly introduced, based on the above, combination method is researched, and the simulation on the method are performed to evaluate the effect of the algorithm. It is a new try for constructing high accuracy marine gravity map.