一种新的捷联惯导系统对准方法

针对舰载鱼雷捷联惯导系统的初始对准问题,提出了一种新的动基座快速传递对准方案——贯序传递对准方案。该方案采用＂先角速度匹配,后速度＋姿态匹配＂的方法,在基座角运动不明显时,使失准角快速收敛。运用卡尔曼滤波算法,对这一传递对准方法与速度＋姿态传递对准方案进行了仿真比较,研究结果表明,贯序传递对准方案具有更快的估计收敛速度,适用性更强。

A Transfer Alignment Method of SINS for Shipborne Torpedo

Addressing the initial alignment of strapdown inertial navigation system （SINS） for shipborne torpedo, we present a new transfer alignment method on moving base, i. e. sequential matching scheme. The scheme adopts the ＂first angular rate matching, then velocity plus attitude matching＂ method to make the misalignment angle converge rapidly when angular motion of the base is slight. The oscillation during the interim is suppressed by keeping measurement noise covariance or by using adaptive Kalman filter. We compare the sequential matching with velocity plus attitude matching by using Kalman filter algorithm. Simulation results show that the proposed method has shorter response time and more general applicability.