The temperature compensation method of fiber optic gyroscope based on EEMD, B-Spline and SVM

摘要

Fiber optic gyroscope is the key sensor in navigation and positioning system. The thermal changes of working environment will affect the drift of gyroscope and errors of the system. This article focuses on the new method of compensation of the drift, which is caused by the changes of environmental temperature. EEMD is a new method of time domain decomposition of signal, from which the decomposition of noises and useful signals can be separated. Based on the choices of the amplitude of ensemble noise and the signal-relative IMFs, this article put forward a new method called EEMD-SVM which is based on correlation and relative entropy. After EEMD denoising, the second order B-Spline and SVM are employed to compensate and fit the temperature drift of gyroscope. At the end of the paper, SVM algorithm was compared with the proposed algorithms in the compensating of the drift. The results show that the proposed methods have a better effect.