Abstract
Most of airborne tactical missiles use a transfer alignment to initialize the SINS. The commonly used transfer alignment algorithms include velocity matching, velocity plus angular velocity matching, as well as velocity plus attitude matching, among them the first one is widely used. The velocity matching algorithm has the advantages of small amount of computation, strong wing disturbance immunity, high estimation accuracy and better value stability. Its disadvantages are also obvious: the filtering convergence time is about 10s, and it is necessary for the aircraft to do S maneuver to obtain the estimation of heading misalignment angle that can lead to a large change in the head point, which is unlikely to happen in the actual tactical flight, so it is usually impossible to estimate the heading misalignment angle.
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