Comparison of Three Transfer Alignment Methods in Marine Missile SINS

Three transfer alignment methods in marine missile SINS are compared by simulations. Simulation results show that velocity plus angular rate matching method is better than velocity matching method. Adopting simple velocity matching method, although eastern and northern level wander angles can be estimated accurately, azimuth wander angle isn´t estimated ideally. This method is suitable to level directional alignment; velocity plus angular rate matching and velocity plus attitude change matching both are faster in transfer alignment, but velocity plus angular rate matching is sensitive to the noise and the structure flexibility deform greatly, the alignment accuracy of this method is lower, it is suitable to SINS in tactical missile that require lower alignment accuracy; Velocity plus attitude change matching can quicken convergence speed, decrease oscillation range of the filtered value, and increase estimation accuracy. Simulation results show that this method can solve transfer alignment question on moving base successfully.