光纤陀螺传递函数的数字信号辨识法

Transfer Function Measurement of Fiber Optic Gyroscope with Digital Signal Recognization Method

通过对全数字闭环光纤陀螺的Y波导施加固定的伪随机阶梯波激励信号,即使陀螺处于一定的转动激励中,比较输入信号与输出角速率信号可对光纤陀螺的传递函数模型进行辨识,建立全数字闭环光纤陀螺的传递函数模型。该方法通过软件施加激励信号实现在陀螺生产阶段的传递函数的在线测量,不必施加真实的转动信号。对该方法辨识的重复性进行了验证,结果表明,辨识出的陀螺带宽的重复性优于0.4 Hz。

A pseudo-random stair signal is imposed on the integrated optic chip（IOC） of a digital closed-loop fiber optic gyroscope（FOG）, and the FOG is equivalent to be rotated with variable angular rates. The transfer function can be recognized or established by comparing the input signal and output angular signal. The input signal is imposed on the IOC with the software in FOG,which means the real rotation is not necessary. We computed the repeatability of this method, and the repeatability is better than 0.5 Hz.