Identification Modeling of Inertial Sensors' Parameters of Strapdown Inertial Navigation Systems

The paper aims at improving the accuracy of the strapdown inertial navigation systems (SINS). The calibration is carried out using a 2-axial motion simulator. The influence of motion simulator instrumental errors is investigated. They effect the errors in the determination of calibration coefficients for SINS accelerometers and gyroscopes. Fiber-optic gyroscopes are used in SINS. The scale factor errors, biases and errors of misalignment axes are accepted as the parameters of inertial sensors error models. SINS is installed on the motion simulator platform. The deviation of the platform rotation axis from a local vertical as well as the platform plane non-orthogonality to the rotation axis are accepted as the motion simulator instrumental errors. A method for determination of the motion simulator instrumental errors, the models of accelerometers errors and fiber-optic gyroscopes errors along with algorithms for calculating calibration coefficients taking into account the motion simulator instrumental errors are described in the paper. The determination of inertial sensors calibration coefficients is carried out under the motion simulator static conditions. As a result of the conducted research, dependences for the determination of inertial sensors calibration coefficients were obtained taking into account the motion simulator instrumental errors.