Abstract:

A transfer alignment method based on inertial reference frame for airborne weapon’s strapdown inertial navigation system (SINS) with arbitrary misalignment angles is presented. Based on two inertial frames, the attitude quaternion is decomposed into three elements: the quaternion that can be determined by slave SINS gyros output, the quaternion that can be calculated by master SINS information and the constant quaternion that need to be estimated. Employing mathematical transformation on specific force equation, the linear measurement equation is obtained. The linear transfer alignment model with arbitrary misalignment angles is built. An adaptive Kalman filter is designed to handle the measurement noise statistics cannot be accurately determined problem. Simulation results show that this method possesses a high accuracy in arbitrary misalignment angles, which provides an effective transfer alignment method for airborne weapon’s SINS.