数字滤波在光纤陀螺信号处理中的应用

针对光纤陀螺（FOG）输出信号存在的角度随机游走、偏值不稳定性、速率随机游走和量化噪声等问题,采用了有限冲激响应滤波器、小波变换阈值滤波器和小波包变换滤波器分别对FOG输出信号进行滤波。利用Allan方差法得到了滤波后FOG信号各误差源的幅度,然后与原输出幅度对比。实验结果表明,这3种滤波方法均具有一定的可行性。其中,小波变换阈值滤波法既可以得到很好的滤波效果,又能有效降低滤波的计算复杂度,为FOG信号处理提供了一定的参考价值。

Applications of digital filter to fiber optic gyro signal processing

For the problem of the output signal of fiber optic gyroscope（FOG） such as angle random deviation,partial value instability,rate random deviation,rate ramp and quantization noises etc,respectively using three kinds of filters,namely finite impulse response filter,wavelet threshold filter and wavelet packet filter,to achieve the purpose of eliminating the output signal noises of FOG.Allan root mean square deviation method is used to obtain the magnitudes of the error signals of FOG and then compared with the original output signal amplitude of FOG.Experimental results show that the three kinds of filtering methods are all feasible.The wavelet threshold filtering method can not only be a good filtering effect,but also reduce the computational complexity.It provides a better reference value for the signal processing of FOG.