A Large Misalignment Angles Initial Alignment Method of SINS based on Feedback Correction and the Fading Multi-innovation Tracking

In order to shorten the initial alignment time of SINS and improve the system's fast response ability, a large misalignment angle initial alignment method is proposed by feedback correction Kalman filter of the fading multi-innovation strong orthogonal tracking. Based on this method, the process of initial alignment does not need coarse alignment, the nonlinear large misalignment angle can be corrected to small misalignment angle and the initial alignment can be completed directly. Also, the employment of the fading multi-innovation improves the feedback tracking ability of SINS, and the system performance is improved.