弹道修正引信滚转角未知条件下MIMU快速初始对准方法

To solve the problem of unknown roll angle of correction fuze in the two-dimensional trajectory correction projectile with dual-spin structure after launch, a method was proposed, using back propagation (BP) neural network to determine the roll angle range of correction fuze for coarse alignment, and then using the satellite navigation system to assist inertial navigation system for rapid initial alignment. Considering the relation between the roll angle error of correction fuze and velocity error of inertial navigation, a neural network model was established and trained with different simulated trajectories of multiple working conditions. The simulation results of spinning projectile trajectory show that the error of estimated roll angle of correction fuze is less than 20° during coarse alignment process when using medium precision MIMU and the error can converge to less than 0.4° within 40 s after launch during fine alignment process.