Abstract:

According to the problem that it is difficult to achieve the coarse alignment when the measurement ship is on a swing base. The essential distinction and applicability between the analytic coarse alignment and the inertial coarse alignment are analyzed contrastively. Based on the nature of the inertial coarse alignment is a dynamic process, the inertial coarse alignment is quoted in the strapdown inertial navigation system (SINS), the theoretical derivation and the mathematical analysis are also presented. The process of coarse alignment is analysed on the typical three axial swing, and the results are compared with the situation of traditional course alignment. The mooring experiment is used to validate the feasibility of the inertial alignment method. The results show that when the measurement ship is on the swing state, the strapdown matrix can be built exactly. Compared with the traditional analytical inertial alignment, the inertial alignment has a better stabilization.