Attitude Measurement Technology of Distributed IMU Based on MEMS Fitted in Electronic Pod

摘要

A new technology to measure attitude of a pod is introduced to deal with the attitude error, which is caused by the deformation of an electronic pod in an airborne. In order to measure the attitude of a pod accurately, distributed IMUs(Inertial Measurement Unit) based on MEMS inertial sensors are fitted in a electronic pod. A transfer alignment process is proposed to estimate and modify the misalignment and other states in real time. The method utilizes the specific relative velocity of the main inertial navigation system (MINS) and the slave inertial navigation system (SINS) to implement transfer alignment. A simulation is designed and the result shows that the misalignment of the method can meet the performance requirements of the pod's attitude and the performance is better than the traditional alignment method in conditions of low SINS formed by MEMS-IMU.