Data map characteristic in aided navigation

Both Terrain Aided Inertial Navigation Systems (TAINS) and Gravity Aided INS (GAINS) are sorted out with Data-map Aided INS (DAINS). The reliability of DAINS relies on the characteristic of the reference map. The relationship has been dealt with among the sensors' sampling cycle, the sensors' precision, the data-map precision and its statistical characteristics. In this way, the related parameters are decided. Through simulation, different vehicle velocities along the same track in a defined region make for different precisions. Some perfect results are obtained.