振动陀螺仪闭环控制系统设计

Designing Method of Closed Loop Control System of Vibratory Gyro

振动陀螺仪位列新一类固态陀螺,已成为与机械转子陀螺、光学陀螺相并列的三大类陀螺之一。在分析振动耦合误差的基础上,提出了振动陀螺仪闭环控制系统的一般设计方案。由于驱动振动幅度远大于读出振动,因此极小的耦合量就会造成很大的检测误差。同时,驱动振动耦合到读出轴的振动信号与角速率振动信号同相,他不可简单地进行分离的特性使其成为影响陀螺精度的要害问题。通过闭环控制系统的设计和实施,可有效提高振动陀螺仪的精度。

Vibratory gyro is a kind of new solid-state gyro, and is as important as machine-rotor gyro and optic gyro nowadays. This paper concentrates on the designing method of closed loop system of vibratory gyro based on analysis of the coupling error of vibratory gyro. For vibratory gyro, very small coupling error will induce great meas- uring error because driving vibration is much greater than sensing vibration. At the same time, the coupling signal from driving vibration to sensing axis has the same phase with the vibration signal induced by angular rate , and this is a critical factor influencing the accuracy because the two signals mentioned above can not be separated simply. Accuracy of vibratory gyro can be effectively improved by designing and implementation of the closed loop control system.