Abstract:

Traditional strapdown inertial navigation system (SINS) with three axis orthogonal configuration is out of order due to a single sensor fault, and navigation error is accumulated quickly with time increasing. In order to solve the problems, a dual axis rotational modulation SINS method based on four gyro redundancy configuration is proposed. Depending on the criterion of multi index constraints, a four gyro tetrahedron redundancy configuration is designed in device level. And an eight sequence dual axis rotation modulation scheme is brought to decrease three axis gyro equivalent drift. The simulation results show the proposed method can improve reliability performance and navigation precision. It has important value in engineering application.