小波滤波在单轴机抖激光陀螺输出信号处理中的应用

单轴机抖激光陀螺仪采用抖动偏频方案消除闭锁,于是陀螺输出信号中不仅包括外界输入的有用角速率信息,也包含了抖动信号和各种高频噪声,应用之前必须有效地去除抖动信号和各种高频噪声.本文采用小波阈值滤波方法对某型单轴激光陀螺输出信号进行了处理,选用Daubechies小波函数作为小波基,以强制消噪的方法,分别用db8,db6,db4小波和不同的小波分解层数对信号进行了滤波,发现采用db4小波对机抖激光陀螺输出信号的滤波效果最优,为工程应用打下了基础.

Application of wavelet filter in single-axis mechanically dithered RLG

Single-axis Mechanically Dithered RLGs adopt dither bias to eliminate the lock-in error, so the dither signal and other high frequency noise is mixed into the RLG output signals, which should be removed efficiently. In this paper, the wavelet threshold filtering was applied to a certain type of RLG for signal processing. The Daubechies wavelet function was chosen as the mother wavelet, the wavelets with different orders(such as db8, db6 and db4) and different decomposed layers were tried in signals de-noising. The result proves that the db4 wavelet works most efficiently for the RLGs.