Temperature Characteristic Analysis And Compensation Of Fiber Optic Gyroscopes

With the increasingly higher navigation accuracy in the aerospace navigation areas,fiber optic gyroscopes(FOGS)on account of its distinctive superiority primarily become the best choice for the navigation system.For the practical FOGS on the project,wider work temperature range is necessary,but in fact,because of the restrict of its structure device’s temperature characteristic,FOGS are extremely sensitive to the mutative temperature environment in the surrounding,bias drift which results from FOGS in the mutative temperature effect has great influence on the navigation accuracy.So the paper mainly deeply research FOGS’ bias drift produced by temperature effect combining the theory and tests,the temperature characteristic of FOGS and the mechanization that produces bias drift are analyzed,meanwhile the different winding methods of FOGS’ fiber ring how compensate and restrain temperature error is explored.Firstly,the paper states general situation of FOGS and basic dynamic of FOGS’ study and development at home and abroad,in addition the application of key technologies,prospects for development,the study purpose,significance and main content of the subject are stated.Secondly,the paper takes the interferometric fiber optic gyroscopes as object,by means of mastering and knowing its principle and main performance index,then temperature characteristic mechanization of FOGS’ optical devices is analyzed as a focus,the crucial factor that FOGS produce temperature error is sought out.Then the Shupe error and thermal stress error in the coils are analyzed in theory and modeling,and these temperature error which has influence on the bias drift of FOGS is compensated by the different winding methods of fiber ring.Then finite element heat transfer models of different winding methods of fiber ring are built up by ANSYS simulation software,meanwhile the restraining effect that the different winding methods of fiber ring act on Shupe error in the whole temperature range is analyzed combing discrete mathematical thermally induced error model of fiber ring which takes turn as a unit,next the compensation effect that different winding methods restrain the heat source from radial and axial direction is deeply analyzed by means of imposing temperature excitation in the radial and axial direction.The analysis finds that sixteen-polar symmetrical winding method has a great restrain effect for the radial and axial temperature excitation.Later,the restraining effect that the different winding methods of fiber ring act on thermal stress error is similarly analyzed combing finite element heat transfer models of different winding methods of fiber ring and discrete mathematical thermally induced error model of fiber ring which takes turn as a unit,it’s found that sixteen-polar symmetrical winding method also has a great compensation and offset effect for the thermal stress error,at the same time,thermal stress error’s influence on the output precision of FOGS can not be also ignored by comparing Shupe error and thermal stress error.At last,FOGS by the quadrupole symmetrical winding method is as experimental subject,the test of FOGS whose fiber ring was heated in the whole temperature range,the radial position,the axial position was conducted,and correctness of the heat transfer models of different winding methods of fiber ring and discrete thermally induced error model of fiber ring in the simulation is validated,meanwhile the compensation effect of fiber ring’s various winding methods for temperature is analogized.