Abstract: The traditional control method of aerocraft inertial self-alignment precision through examining electrical parameters is unreliable.To ensure the precision applicability of aerocraft inertial self-alignment executed before flight navigation,several online validating methods are analyzed and researched,including the conventional direct optical sighting method,the methods proposed innovatively of indirect optical sighting combined with transitive device,and the mathematic estimate correction method based on different calculating paths.The errors [JP3]effect process of direct optical sighting method is analyzed,and the new conceptions of validation methods are descripted.Meanwhile,the error elements and application specialties of these methods are sorted out.These methods’ feasibilities are verified by theoretical analyses and application practices.

Key words: Aerocraft, Self-alignment, Precision