线性加速度计在压电陀螺卡尔曼滤波技术中的应用

Application of linear accelerometer to Kalman filter for piezoelectric gyro

针对光电稳定平台常用的压电陀螺随机游走噪声大的缺点,提出采用基于线性加速度计的卡尔曼滤波技术对其进行信号滤波。利用卡尔曼滤波理论,建立了压电陀螺角速率状态观测方程,采用线性加速度计测量平台惯性角加速度,由此对陀螺信号进行了滤波。实验结果表明:采用线性加速度计能够在不影响陀螺带宽的前提下将压电陀螺的随机游走噪声水平由原有的0.005(°).s-1/槡Hz降低到0.001 25(°).s-1/槡Hz,提高了光电平台的稳定精度。

As for the larger random walk noise of a piezoelectric gyro in the stabilized platform,the Kalman filtering technology based on a linear accelerometer is proposed to perform the signal filtering.Based on Kalman filtering theory,the observation equation of an angle rate for the piezoelectric gyro is established,and the linear accelerometer is used to measure the inertial angle accelaration of the platform.Then,the signal filtering of piezoelectric gyro is achieved.Experimental results show that the random walk noise level is reduced from 0.005（°）·s-1/Hz to 0.001 25（°）·s-1/Hz by using linear accelerometers and without affecting the bandwidth of piezoelectric gyro,which improves the stability precision of the optoelectronic platform.