Research On Fiber Optic Gyro Recalibration Period Estimation Method Baesd On Critical Degradation Information

In recent years,with the development of fiber optic gyroscope(FOG)technology,high precision strapdown inertial navigation system(SINS)has been applied to ships,submarines and other carriers with super-long working profiles.As an important inertial device in inertial navigation system,the current research on the calibration of FOG mainly focuses on the estimation of error parameters and the analysis of calibration accuracy,while neglecting the research on the re-calibration of periodic direction.The existing problems are that the predicted reliability of FOG is simply regarded as the re-calibration period,which leads to the recalibration period in practical use.It does not match the performance of service,and even has no basis to calibrate the guarantee period.In order to solve this problem,this paper proposes an estimation method: taking gyro bias as the key degradation information,analyzing the degradation failure law of gyroscope,according to the gyroscope bias degradation data collected in practical work,modeling the degradation failure of these data based on statistical theory,and then estimating the refocusing period of fiber optic gyroscope by extrapolation method.The accelerated stress degradation test of gyroscope is designed,and the period of rescaling is predicted by accelerated degradation theory.The final result is consistent with the conclusion of model analysis.This paper mainly includes the determination of the zero bias threshold of the key degraded information gyroscope,the modeling of degradation failure,the re-scaling period estimation method based on degradation information and the re-scaling period estimation method based on accelerated degradation information.This paper firstly summarizes the principle of inertial navigation error.Since the inertial navigation error mainly comes from the gyro,the main cause of the gyro error is the gyro drift.Therefore,by analyzing the error equation of the strapdown inertial navigation system,the output error and navigation positioning of the fiber optic gyro drift are analyzed.The impact and corresponding simulation analysis.The fiber optic gyro re-counting period estimation is carried out.Firstly,the gyro bias is selected as the key characteristic parameter of the degradation research.According to the longitude requirement of the navigation system,the characteristic parameter threshold is inversely introduced by the inertial navigation simulation algorithm.Subsequently,through the discussion of the composition and structure of the fiber optic gyroscope,the types of degradation failure and the degradation failure mechanism of the gyroscope are analyzed.The reliability theory is introduced,and two kinds of degradation failure models based on the degenerate trajectory and the degenerate quantity distribution are established.The reliability function is constructed by the gyro degradation data,and the fiber gyro re-standard period is finally obtained.Finally,the accelerated degradation test is carried out for the selected gyro samples.The degradation data of the fiber optic gyroscope under accelerated stress conditions is studied.The Arrhenius equation is used as a model to calculate the gyro re-standard period and constant stress conditions under acceleration conditions.Basically consistent,the accuracy of the estimation model is verified.