A self-calibration method based on one-time electrification before launching for Inertial Navigation System

The measuring error of Inertial Navigation System (INS) is the main fact that affects the hitting accuracy of inertial-guided missile. Error parameters compensation could get high-precision. First of all, this article builds an error model of gyro and accelerometer, and then in order to achieve these error parameters' value as closely as possible to their true value in application, a quick self-calibration method based on one-time electrification before launching for inertial platform is proposed. Via this method, INS rotates to 9 particular positions, outputs of inertial sensors are collected in drift state and each error parameter can be separated. The self-calibration method requires no additional devices, improving the maneuverability of the whole system. Finally, experiments are carried out using both the self-calibration method and unit calibration method, the two methods' results show that the largest compared accuracy is 9.40%, which demonstrates the practicability and validity of the suggested method.