Study on calibration algorithms of gyroscopic drift error that affected by the acceleration harmonic errors of vibration table

Abstract

The acceleration-squared-sensitive coefficients of gyroscopic drift error are usually calibrated by vibration table. According to the theoretical analysis and experimental analysis of vibration table, it is noticed that the output acceleration errors of vibration table are mainly consist of harmonic components. This paper presents a study on the influence of the harmonic acceleration errors on the calibration of gyroscopic drift errors. Two commonly used calibration algorithms which are periodic average method and least-square method (LSM) are introduced and analyzed considering the harmonic errors influence. The theoretical analysis of the calibration algorithms shows that the periodic average method is affected by the 1st-order harmonic acceleration error of the vibration table and the LSM is affected by the 1st, 2nd and 3rd harmonic components, the higherorder components have little influence on the calibration. The study shows that the suppression and compensation of low-order harmonic errors are more important for improving the calibrating accuracy of the gyroscopic drift error.