Abstract
Generally, the conventional ship's inertial navigation systems (S-INS) needs about 4-hours to settle the initial alignment under movement of ship. This paper presents an effective approach to the rapid initial alignment on a strapdown S-INS using three fiber-optic gyros and three conventional accelerometers.
In this approach, a modified least square filter as pre-filter of the measured data disturbed by movement of ship is used to improve the accuracy and settling time of initial alignment.
It is confirmed by simulation that the accuracy and the settling time (convergence time to meet the required accuracy) are improved by using this approach.
