舰载惯性基准故障下的姿态信息重构方法

Attitude information reconstruction approach for shipboard inertial reference systems under fault condition

为满足舰载武器对姿态基准信息的可靠保障需求,提出了一种基于分布式惯性基准的姿态信息重构方法。首先,基于船体模态叠加理论得到不同位置点之间的角形变关系,在此基础上建立了角形变空域预测模型;其次,利用多套惯性基准设备的姿态输出,通过数据预处理获得船体角形变,并用于形变空域预测模型的参数估计;最后,利用多段正常的船体角形变数据对故障惯性基准与主惯导之间的形变进行预测,再将主惯导的姿态补偿形变预测值,得到故障惯性基准的重构姿态信息。实船数据验证结果表明,利用4套正常工作的惯性基准的姿态输出,即可实现对全船任意故障惯性基准的姿态信息重构,相对预测精度比优于70%。所提方法可用于惯性基准故障条件下的应急姿态信息保障。

In order to meet the reliable requirements for attitude reference information of shipborne weapons,an attitude information reconstruction method based on distributed inertial reference system(IRS)is proposed.Firstly,the angular deformation relationship between points in different positions is obtained based on the mode superposition theory.On this basis,the spatial prediction model of angular deformation is established.Secondly,using the attitude output of multiple IRSs,the angular deformation of the hull is calculated through data processing and used for parameters estimation of the deformation spatial prediction model.Finally,the deformation between the faulty IRS and the main inertial navigation system(MINS)is predicted by using multiple reliable angular deformation data,and then the attitude of the faulty IRS is reconstructed by compensating the MINS attitude to prediction deformation values.The verification results of real ship data demonstrate that the attitude information of any faulty IRS can be reconstructed by using the attitude output of four reliable IRSs,and the relative accuracy ratio is better than 70%.The proposed method can be used for providing emergency attitude information for the faulty IRS.