Stimulation And Error Analysis Of The Optical Path In Interferometric Fiber Optic Gyroscope

The fiber optic gyroscope(FOG) is a new-type angular rate sensor based on Sagnac effect. As compared with mechanic gyro, it has many advantages like wide dynamic range, low cost, light weight, long life and high reliability and so on. So it has extensive application in the controlling of aviation, space and navy ship, also in the navigation system. With the further study, the requirements of the precision and stability of the FOG are also improved. But the question about the stability of the FOG is always the important factors that influence further improvements of the FOG. It has seriously affected the application of the FOG in ship using navigation system.Firstly this paper introduces the characteristics, development at home and abroad, the development trend and the application prospect of the FOG. And also introduces the basic principle, the phase modulation method and the digital close-loop step wave modulation principle of the FOG briefly.Secondly, this paper analyses the principle and features of the fiber source, the coupler, the multifunctional integrated optical devices and the fiber loop which used in the interferometric fiber-optic gyroscope(IFOG). Also it analyses the parameters requirements of the selection of the high accuracy IFOG devices, and the influence and solution scheme of the fiber loop temperature effect. By means of the analysis and comparison of the main optical devices, it presents that the erbium-doped broadband fiber source, the polarization maintaining fiber and the integrated optics chip y waveguide are the best choice in the IFOG.Thirdly, based on the analysis of the devices in the optical path, this paper analyses the optical model of the optical devices and builds the mathematical model with jones matrix. Then according to the optical path system structure of the IFOG, builds the mathematical model of the optical path system with jones matrix and coherent matrix.Finally, this paper analyzes the factors forming of the irreplaceable error in IFOG and presents the solution schemes. Then it simulates the optical model of the optical path system of IFOG, and analyzes the effects on the output and the errors of the IFOG when the optical devices parameters change in detail.