Investigation on Random Error Properties of Optic Gyro Based on Wavelet Variance
Yukai Gao · Journal of Chinese Inertial Technology · 2004
Allan variance is a useful tool for analyzing the frequency stability of optic gyro random errors. According to the properties of bias drift of optic gyro, the wavelet transform is used to study the wavelet variance of random process. The properties of a time series can be summarized by the wavelet variance on a scale by scale bases. For giving better protection against leakage, the wavelet variance can be used to provide more accurate conversion between the time and frequency domains than that using Allan variance. Experiments demonstrate the correspondence of wavelet variance with Allan variance for random process, but wavelet variance is more accurate in frequency domain.