Method for signal detection of integrated optic gyroscope based on digital signal processing

摘要

The integrated optic gyroscope (IOG) has many advantages, such as small volume, light quality, low propagation loss, vibration-resisting and high stability, which is the development direction of high-precision and miniaturized optic gyroscope. The result of signal detection influences the precision and detecting sensitivity of IOG directly. Noise is the crucial factor to limit detecting precision. In the practical application, the output signal of IOG is mixed up with many sorts of noise, which interferes the detection of useful message and lead drift and instability of output signal of gyroscope. So increasing the precision and detecting sensitivity directly of IOG needs not only suppressing the noise origin, but also detecting the signal in noise with effective method. According to the characteristics of output signal from detector, a signal processing method for IOG is introduced, which detects signal from noise by taking advantage of digital filter and cross-correlation, based on a digital system comprised of a high-performance digital signal processor. The result of experiments shows that percent error is less than 3 percentage or large under condition of 10 dB signal-to-noise ratio. The information of rotation in IOG is extracted effectively from the output signal mixed up with noise by this method.