Temperature Drift Modeling And Compensation Of Fiber-Optic Gyroscopes

Fiber optic gyroscope (FOG) is a new type of angle-velocity transducer, with the merits of fast startup, wide dynamic range, small volume, light in weight and so on. They attract pubic attention widely since invented. With the deepening of the study, the request of the moderate highly-precision has been enhanced. But the kernel components are so sensitive to temperature that temperature becomes one of the most difficult problems for fiber-optic gyroscope to the entry into practical engineering.It compensates temperature drift of FOG by modeling thermally-induced error in this thesis. In this thesis, based on output of medium precision FOG, thermal factors which influence FOG drift are studied. Quantitative analysis and qualitative analysis are introduced and influences of temperature ramp and secondary ramp are made out. Finally the general temperature drift model is built. The model which has a uniform structure is based on subsection making use of temperature ramp and secondary ramp as of subsection basis, figuring out model factor according to least square method. The range of temperature experiments are between -40℃～+60℃. New data are used to validate the model. After compensation, the precision of FOG can achieve at 0.1°/h, increased by 50%. The model is proven to be viable and effective.