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动态特性是光纤陀螺的一项重要技术指标,传统的机械转台无法提供测试条件。提出了一种基于相关辨识的光纤陀螺动态特性测试方法;根据全数字闭环光纤陀螺采用数字阶梯波反馈实现闭环控制的工作原理,通过在闭环反馈信号中叠加伪随机信号的方法来进行动态特性测试。将反馈阶梯波上叠加的伪随机信号作为辨识输入信号,光纤陀螺闭环数字输出作为辨识输出信号;将数字闭环输出经过小波滤波后的信号与伪随机信号进行相关运算后得到陀螺闭环回路的脉冲响应,再通过傅里叶变换得到陀螺的幅频和相频特性。利用该方法获得的光纤陀螺动态特性与利用正弦波叠加方法得到的结果具有一致性,证明了该方法的有效性。且该方法具有易于实现,适合实际工程应用。
Dynamic characteristics of fiber optic gyroscope is an important technical indicators, the traditional mechanical turntable can not provide the test conditions. A dynamic testing method based on correlation identification is proposed. According to the working principle of closed-loop control using digital step-wave feedback in all-digital closed loop fiber optic gyroscope, the dynamic characteristics test is carried out by superimposing the pseudo-random signal in the closed-loop feedback signal . The pseudo-random signal superimposed on the feedback staircase wave is used as the identification input signal, and the closed-loop digital output of the fiber optic gyroscope is used as the identification output signal; the digital closed loop output signal after wavelet filtering is subjected to the correlation operation with the pseudo-random signal to obtain the impulse response , And then through the Fourier transform to get the gyroscope amplitude and phase frequency characteristics. The dynamic characteristics of the fiber optic gyroscope obtained by this method are consistent with those obtained by the sine wave superposition method, which proves the effectiveness of the method. The method is easy to implement and suitable for practical engineering application.