Investigation of testing dynamic characteristics of digital closed-loop fiber optic gyroscope
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摘要: 光纤陀螺是一种基于萨格纳克效应的新型角速度传感器,带宽远大于机械陀螺,不能用传统机械设备测试其动态特性. 根据全数字闭环光纤陀螺采用数字阶梯波反馈实现闭环工作原理,通过在集成光学调制器上叠加信号,用阶梯波引起的相位差代替外加角速度引起的相位差,设计了动态特性的数字测试方法. 从系统传递函数的推导中得到此方法的等效性, 并实测光纤陀螺的阶跃响应和频率响应,初步得到光纤陀螺带宽超过2kHz的结论.Abstract: The fiber optic gyroscope is a new rotation sensor, and it is based on the Sagnac effect. The bandwidth of fiber optic gyroscopes is wider than mechanical gyroscopes. It is difficult to test dynamic characteristics of fiber optic gyroscopes with traditional equipment. Considered the principle of digital closed-loop fiber optic gyroscopes, the technique of testing dynamic characteristics was schemed out by means of adding signal to integrated optic modulator. The phase difference due to rotation rate was replaced with the phase difference generated by ramp phase modulation. Based on system transfer function, equivalence of the technique was proved. Step response and frequency response were tested. The conclusion that the bandwidth of FOG exceeded 2 kHz was approved.
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Key words:
- simulation /
- fiber optic gyroscopes /
- dynamic characteristic /
- testing
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