Study on the rapid and accurate transfer alignment for SINS

Aim at the problem of rapid and accurate transfer alignment for space maneuver platform weapon strapdown inertial navigation system (SINS) on moving base, the model of transfer alignment scheme using attitude matching method was established for space weapon, and a method of predictive filter (PF) was used in the transfer alignment for space weapon. In this method, the model error is assumed unknown and estimated as part of the solution; the model error is not limited to Gaussian noise characteristics, and the algorithm can be implemented on-line to both filter noisy measurements and estimate state trajectories. The results of simulation show that this method has better precision and convergence than that of KF. Furthermore, it decreases the computation time by reducing the number of states, satisfied the requirements of precision and speed which is emphasized in transfer alignment for space weapon.