The Research Of Transfer Alignment And Accuracy Evaluation Techniques On Ship Carried Weapon Inertial Navigation System

Transfer alignment is a technology being appropriate to achieve fast and accurate initialalignment of ship-borne weapons inertial navigation system on a moving base. But due tonumerous interference factors, such as the maneuver manners, lever arm effect and dynamicflexure of carrier, there are still certain alignment errors among existing transfer alignmentmethods, causing a direct impact on the performance of the reaction time and hit accuracy ofthe ship-borne weapons. Using transfer alignment accuracy evaluation technique can obtainreliable, accurate alignment errors which can be the main basis for the evaluation of transferalignment performance. Therefore, research and improvement of the transfer alignmentaccuracy assessment technology have an important reference value for the rational design andimprovement of transfer alignment scheme, and an important practical significance toimprove the alignment and combat performance of the inertial navigation system of theship-borne weapons.Take ship-borne weapons inertial navigation system as the research object, for theperformance of traditional transfer alignment accuracy evaluation methods is limited by theship restricted mobility and the marine complex motion environment, this thesis studies on thetransfer alignment and its accuracy evaluation technologies, an approach of accuracyevaluation suiting no-intentional maneuver is proposed. And the validity of this approach hasbeen verified in simulation.Through analyzing the basic correlative theory of inertial navigation system, to carry outthe transfer alignment technology, which focusing on analysis of performance improvementan integrated matching method as well as transfer alignment interference sources, and leads tothe problem of transfer alignment accuracy evaluation and the requirement of evaluation hasbeen put forward. Based on the resemblances between transfer alignment and its accuracyevaluation, the accuracy evaluation technology has been carried out, including of the selectionof reference system and information, the establishment of mathematic model for evaluationsystem and kalman smoothing algorithms. To solve the main problem for estimationperformance of the azimuth angle error is limited by the weak maneuverability of ship,according as integrated matching method of line motion information plus angular motioninformation in transfer alignment, the attitude of master inertial navigation system has beenintroduced as the auxiliary reference information effectively reduced requirements of thecarrier intentional motion. Even on the simple condition of waveringly motion can this approach achieve all alignment errors been estimated accurately. Aiming to the problem ofattitude information being vulnerable to dynamic flexure, an adaptive kalman filter based onclassified adaptive factors has been proposed to suppress unreliable attitude information onthe results of filtering process. Simulations on different attitude measurement noises havebeen implemented to validate the reliability and stability of the designed accuracy evaluationmethod, and verification results show that the research working plays an important role inreducing the carrier maneuvering requirements, improving the assessment of the performanceof its stability in complex measurement noise conditions.