Research On Test System And Calibration Techniques Of FOG

The Fiber Optic Gyroscope(FOG) is as a kind of new inertial measurement equipment, It is widely used in SINS and deeply concerned in navigation field, Because it is simple in structure, with no rotating parts and wide dynamic range. The key technology of the development of SINS is the design of SIMU's hardware, the technology of alignment and the test and error calibration technology of SIMU. This paper designed the test and calibration system of FOG, the system's test platform is three-axis flight simulation turntable existing in laboratory, and the core of which is IPC. This dissertation discusses the technology of calibration and test of SINS. Lots of experiments prove it has good results.According to the characteristics of FOG, This paper designed fiber IMU data acquisition circuit, it was verified by experiment the design was right and hardware and software of it run reliably. In order to solve the traditional tests' defects that it takes lots of time and energy collecting data and controlling turntable, this paper developed automatic test and calibration software of FOG based on the object-oriented C# language, which also has function displaying real-time data and the curve on the software interface. The paper analyzed and established the static error model of FOG, and Allan variance and the total variance was used to analyze characteristics of the random error of FOG. To solve the problem that the estimation error of Allan variance is great at long-term ?-values, according to the frequency properties of FOG random errors, a new method for characterizing the random errors based on Total variance is presented, which proposed an effective, credible error coefficient calculation method for the calibration of the FOG.Finally, According to characteristics of fiber optic gyro IMU itself, four error terms static error model for fiber optic gyroscope were established. Rate test and 24-position method test were designed and completed to identify coefficients of FOG static error model by using three-axis flight simulation turntable existing in laboratory. Finally, Parameters of FOG calibration was used to compensate error, points in part, the validity of the parameter was verified by experiment.