Resonator Fiber Optic Gyro Output Characteristics And Simulation And Analysis Of System Model

Fiber-optic gyroscope is a kind of based on Sagnac effect of angular rate sensor, its in aerospace and navigational navigation and guidance system plays an important role. Because of its dynamic range wide, no mechanical structure, low cost, small volume and high reliability etc, have been gradually replaced the machined gyroscope, become inertial navigation and guidance technology development direction. At present interferometric fiber optic gyro technology is well established, but in miniaturization it meet difficulty because of its fiber optic ring length requirements, and in further improving precision also is in difficulty. The resonator fiber optic gyro as the second-generation fiber optic gyroscope, can be solve to the problems of miniaturization and precision, so attach great importance to by domestic and foreign research institutions. Therefore, a study of resonator fiber optic gyro is important. This paper analyzed theoretically the core and subject of resonant fiber-optic gyroscope that is the resonant characteristics of fiber ring resonator, and has been modeling in the Optical system and control system of resonator fiber optic gyro, laid the foundation for the research of resonator fiber optic gyro. The main content of this paper is divided into three parts:The first part describes the basic principle of resonator fiber optic gyro. First theoretically analyzes the structure of resonator and resonant characteristics, then derived the input-output relationship of resonantor fiber-optic gyroscope. On this basis, gives the main characteristics parameters of the resonator including resonator finesse, resonant depth, resonance width, freedom spectral width and half of full width. These parameters reflects the stand or fall of resonator resonant characteristics.The second part according to resonator's input-output transfer function, we use matlab to simulated and analysed the main parameters that constituted resonator various optical device. These parameters including coupler coupling coefficient, coupler loss coefficients, the unit length transmission loss of optical fiber that constituted the resonator, resonant cavity of fiber length, Laser light spectrum line width and so on.These lay a theoretical basis for the resonator making. And then analyzed these parameters influence on the resonator finesse.The third part is mainly to the resonant fiber-optic gyro modeling and analysis. First, modeling the various optical device that constitute resonator using Jones matrix optical principle, get their light transmission model, including the cavity, couplers, polarizers, and optical transmission Jones matrix of the solder joint model. Based on this we get the light path transmission model of resonant fiber-optic gyro and deduced the output light intensity expression that based on the transmission matrix. Analyzes the polarization error and the optical Kerr effect error that in the resonator, and proposed control measures.The forth part is modeling the resonator fiber optic gyro control system, analysis the using open and closed loop control system for the detection of resonator fiber optic gyro principle. Resonator fiber optic gyro control system is divided into two parts a clockwise loop and counterclockwise loop, to modeling these two loops and get their mathematical model. In the mathematical model by the control link using integral control and PID control. Application of automatic control theory analysis the step responsethe of the control system that adopts integral control and PID control, mainly analyzed integral control and PID control system model using Matlab simulation.