Theory analysis and application of oversampling in FOG

In digital closed-loop fiber optic gyroscope, AD converter is used to translate analog input into digital signal. Quantization noise in AD conversion will influence bias stability of FOG. Oversampling is a kind of technology to reduce quantization noise. In this procedure noise power is distributed equably in the whole scale of direct current to sampling frequency, so the part of direct current to Nyquist frequency is reduced. In this paper, character of noise in high precision FOG is analyzed. According to the character of low noise in high precision FOG, oversampling method fit for high precision FOG is used. To solve average error come from low noise, white noise is add into the input signal. Through experiment in FOG, it is proved that this method of oversampling is effect to improve bias stability.