空间三轴激光陀螺高精度抖动剥除算法研究

Research on the High-Precision Dither Stripping Algorithm of Orthogonal Triaxial Laser Gyroscope

激光陀螺的输出信号中包涵外界输入角速度、机械抖动角速度两部分信息,机械抖动角速度是一个叠加了一定噪声的标准正弦振动。针对空间三轴机抖激光陀螺仪,提出了一种高精度的新型正弦抖动信号滤除算法,通过自适应陷波器和有限冲击响应数字滤波器的组合,能极大地衰减激光陀螺仪零偏输出波形中的正弦分量,实现外界输入信号的高精度准确提取。实验结果表明,该抖动剥除算法效果显著,在保证快速响应外界输入的条件下能够实现高精度地提取角速度信号,可有效降低惯性系统的成本和复杂度,进而提高产品质量可靠性,具有很强的工程实用价值。

In the practical engineering,the output signal of ring laser gyro consists of external input angular velocity and mechanical dithering angular velocity,which is a standard sinusoidal waveform with random noise.In order to improve the detection accuracy of orthogonal triaxial laser gyro,this paper focuses on the implement of high-precision dither stripping algorithm.Through the combination of adaptive notch filter and finite impulse response digital filter,the sinusoidal component in the zero bias output waveform can be greatly attenuated,which guarantees the accurate extraction of external input signals.The corresponding experimental results show that the effect of dither stripping algorithm is remarkable.It can reduce the cost and complexity of inertial systems,and improve quality and reliability,which has strong practical value.