In order to improve the precision of Doppler and Strapdown inertial navigation system (SINS) integrated navigation system with moving base, an in-flight alignment method is proposed by making an uniform circular motion of the aircraft according to the phenomena avaliable in the Doppler/SINS navigation system tests. The platform error-angles of the SINS can be estimated quickly and the prediction precise can be improved by this method. Experiment verifies the feasibility and validity of this method. Theoretical analysis shows that the steady state limit of the estimation can be highly reduced by proposed method, and the method is valuable for practical application.Keywords Airborne SINS · Doppler · In-flight alignment · EKF · Filtering estimation
IntroductionAs limited by the status of INS equipment and the level of theoretical research, the in-flight alignment cannot be implemented effectively just by using the existing INS equipment on airborne which can finish the work of solver on its own [1]. Most scholars tend to believe that the INS resolving capability can be improved with the assistance of some airborne mission equipment, and the attitude misalignment angles can be estimated and compensated effectively by using the auxiliary information as reference as obtained from some established satellite positioning