为了实现光纤陀螺的工程化，对数字滤波器的结构进行了改进，提出了一种多级抽样率转换器(SRC)与梳状带阻滤波器相结合的滤波算法。把闭环光纤陀螺的信号处理系统分为环内和环外两个部分，环外输出使用了加凯泽－贝塞尔窗的FIR滤波器。介绍了改进算法的优点，给出了新算法的实现方法。使用MATLAB对算法进行了仿真实验。结果表明，改进算法可明显地提高数字信号的处理效率，可保证在采样频率变换的过程中有用信号不会产生混叠，提高了光纤陀螺的精度。

For applying the fiber optic gyroscope (FOG) to various projects. The configuration of the digital filter is meliorated. A new filter combining multilevel sampling rate converter(SRC) with a pectinate band-stop filter is designed. The insideloop signal processing is separated from the outside-loop,and different method is used to deal with them. A Kaiser-Bessel window FIR filter is applied in the outside-loop signal processing. The theory of multi-rate signal processing and the method for realization are introduced. The optimized arithmetic is simulated by MATLAB,and the results indicate that the method restrains the frequency distortion and improves the sensitivity of the FOG.