Abstract:The launch vehicle is disturbed by wind gusts at the launch site and there are line wobble and angular wobble, which cause the initial alignment accuracy to be degraded. The traditional ratio single integral anti-wobble algorithm cannot converge quickly within the specified time and obtains the heading alignment accuracy with uncertainty, to address this problem, this paper proposes a QUEST-based ratio double integral anti-wobble alignment method. First, the attitude decomposition method is used to double integrate the specific force information to obtain the position information under different reference systems, and the attitude matrix is solved by the QUEST method. The experimental results show that the algorithm can overcome the heading uncertainty of the single integration of the specific force, make the heading attitude converge quickly, effectively reduce the alignment results under the influence of wobble, and improve the environmental adaptability of the launch vehicle.