Research On Error Modeling And Calibration Technology Of High Precision Fiber Strapdown Inertial Navigation

At present,high-precision fiber optic strapdown inertial navigation is widely used in weapons and aerospace systems.In order to improve the long-term pure inertial navigation accuracy of our company's high-precision SINS,this paper mainly studies including: system error model of FOG SINS,temperature error model of gyro and accelerometer in FOG SINS,the accurate calibration method of error coefficients of FOG SINS.1.Analyze the system error sources of FOG SINS,deduce the system error model of SINS,and analyze the sources of attitude,velocity and position errors in the navigation process.2.Analyze the gyro error model in sins,and study the influence principle of temperature on the bias and scale factor of gyro channel in SINS.Study the compensation results of different temperature models for the bias temperature drift error,establish a new twodimensional interpolation model,and use temperature and temperature variability to complete the compensation of the bias temperature drift error.Contrast the different modeling and compensation methods of the scale factor,create a new scale factor interpolation modeling method under full temperature and full quantity,and use this method to complete the temperature error compensation of the gyro scale factor.3.Analyze the error model of the accelerometer channel in the FOG SINS,and study the effect of temperature on the accelerometer bias,scale factor,and installation error.By comparing different modeling methods,create a new high-precision accelerometer multilocation temperature modeling method and compensate the error of the accelerometer.4.Research on the calibration technology of optical fiber inertial navigation.Study the application of discrete calibration and systematic calibration in solving inertial navigation error.Use systematic calibration to complete the calibration of inertial navigation bias error,scale factor error,and installation error coefficient error.Study an improved systematic calibration method for accelerometer symmetry,and solve various error parameters including accelerometer positive and negative scaling factors.