Investigation of random error model for fiber optic gyroscope

The performance of gyroscope decides the accuracy of inertial reference system. In order to diminish the error of the gyroscope and to improve its precision, the gyroscope's error model was accurately founded. Methods of PSD (power spectrum density), ARM A, and Allan variance were federally used to study of the error speciality and modeling technology of the FOG (fiber optic gyroscope). The Allan variance and PSD were utilized to analyze the output of the FOG, and some main noise of the fiber optic gyroscope could be extracted and confirmed, then the performance of ARMA and AR of the FOG was evaluated. By analyzing the practical data of the FOG, it is shown that Allan variance and PSD are identical with analyzing the error of the fiber optic gyroscope, and ARMA is an effective method to found the random error model for the fiber optic gyroscope.