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针对光纤陀螺频带测试角震动台输入频率低的问题,通过在光纤陀螺反馈阶梯波上叠加正弦信号用于等效外部输入角速度,对陀螺解调输出信号按照幅值进行判断得到陀螺带宽。分析了输入等效正弦波幅值满足条件;针对正弦信号在相位调制器上调制产生的相位差随频率变化的缺点对相位差幅值进行补偿;提出了利用直接数字合成技术生成正弦波信号和极值搜索算法检测信号幅值的带宽检测方案,利用陀螺自身硬件基础实现自主检测。通过建立数字闭环光纤陀螺模型,利用Simulink进行了仿真分析。结果表明该检测算法能实现陀螺频带宽度的全频率范围测量,不受外部输入信号测试频率限制,能够用于光纤陀螺带宽测试。 相似文献
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Space radiation effect on fibre optical gyroscope control circuit and compensation algorithm 下载免费PDF全文
The process of a γ-irradiation experiment of fibre optical gyroscope (FOG) control circuit was described, in which it is demonstrated that the FOG control circuit, except for D/A converter, could endure the dose of 10krad with the protection of cabin material. The distortion and drift in D/A converter due to radiation, which affect the performance of FOG seriously, was indicated based on the elemental analysis. Finally, a compensation network based on adaptive neuro-fuzzy inference system is proposed and its function is verified by simulation. 相似文献
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Electrical crosstalk-coupling measurement and analysis for digital closed loop fibre optic gyro 下载免费PDF全文
The phase modulation and the closed-loop controller can
generate electrical crosstalk-coupling in digital closed-loop fibre
optic gyro. Four electrical cross-coupling paths are verified by
the open-loop testing approach. It is found the variation of ramp
amplitude will lead to the alternation of gyro bias. The amplitude
and the phase parameters of the electrical crosstalk signal are measured
by lock-in amplifier, and the variation of gyro bias is confirmed to
be caused by the alternation of phase according to the amplitude of
the ramp. A digital closed-loop fibre optic gyro electrical
crosstalk-coupling model is built by approximating the electrical
cross-coupling paths as a proportion and integration segment. The
results of simulation and experiment show that the modulation signal
electrical crosstalk-coupling can cause the dead zone of the gyro when a
small angular velocity is inputted, and it could also lead to a
periodic vibration of the bias error of the gyro when a large angular
velocity is inputted. 相似文献
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