基于等效角振动的光纤陀螺带宽测试方法

光纤陀螺的数字闭环调制解调原理决定了其带宽可以达到几百甚至几千赫 兹，当光纤陀螺带宽大于角振动台最高频率时，采用传统的角振动方法无法准确测试其 带宽。分析了光纤陀螺带宽测试的原理，提出了一种基于等效角振动的光纤陀螺带宽测试 方法，该方法能够满足大带宽光纤陀螺的带宽测试。对同一只光纤陀螺进行了带宽测试的 对比试验，证明所提出的方法与角振动方法的测试结果一致。将该陀螺带宽增大到原带宽 的4 倍后，采用此方法进行带宽测试，测试结果与理论计算值一致。

A Bandwidth Test Method for Fiber Optic Gyroscope Based on Equivalent Angular Vibration

Determined by the principle of digital closed-loop modulation and demodulation, the bandwidth of fiber optic gyroscope (FOG) can reach up to hundreds of or even thousands of hertz, which cannot be accurately tested by traditional angular vibration method for the FOGS which bandwidth is higher than the highest frequnce of the angular vibration equipment. In this paper, the bandwidth test principal for FOG was analyzed and a new test method based on equivalent angular vibration was proposed. Moreover, control tests were conducted to validate the new test method. As a result, the bandwidth obtained by the new method is consistent with the angular vibration test. A quadruple bandwidth was also tested by the new method, and the result matched well with theoretical calculation.