Application of Total Least Square Algorithm in Static Decoupling of NGMIMU

The linear coupling of Non-gyro Micro Inertial Measurement Unit (NGMIMU) is a kind of system error that affects the accuracy of measurement seriously. In this article, the author puts forward a new linear decoupling algorithm which simultaneously considers the error of standard input signal and output of accelerators when the coupling parameters are calculated. The Total Least Square (TLS) solutions of coupling parameters own the minimum characteristic to the input and output values. Then these parameters are used to reconstruct the outputs of accelerators so as to realize the decoupling. The emulation result show that the ratio of decoupling error is less than 8% and verify the feasibility of this algorithm.