光纤陀螺开环增益的实时估计与补偿

开环增益是影响闭环光纤陀螺控制稳定性及控制精度的重要参数。从光纤陀螺的数学模型出发推导了开环增益的计算公式。在数字闭环光纤陀螺相关检测的基础上提出了一种开环增益的估计方法,通过在积分控制环节前施加一个方波抖动信号,然后在信号处理器中进行相关解调,实现了开环增益的在线实时估计。同时利用数字逻辑中比例控制系数的可操作性,通过实时调整比例控制系数K来补偿硬件部分增益G的变化,从而实现陀螺开环增益的自补偿。最后通过实验证明了该方法的正确性。

Real-time Estimation and Compensation of the Open-loop Gain of FOG

The open-loop gain is an important factor that affects the control stability and precision of Fiber Optic Gyro (FOG). A calculation formula of the open-loop gain is deduced based on the mathematic model of FOG. Based on correlation detection theory, a method is given to realize the real-time estimation of open-loop gain of FOG by adding a periodical square signal before the integral control unit and then acting correlation demodulation in the digital signal processor. The real-time compensation of the open-loop gain of FOG is also realized by adjusting proportional control coefficient K expediently in the digital signal processor to counteract the fluctuation of G bringing by hardware change. Experiments are done to prove the validity of the method.