基于不对称方波调制的光纤陀螺本征频率测试方法

针对工程化过程中本征频率测试不方便的问题,提出了一种新的解决方法。从光纤陀螺本征频率的测试机理出发,采用不对称方波对Y波导进行调制,分析解调信号,得到相邻脉冲宽度差值的绝对值与调制频率的关系,将本征频率的测试转化为极值搜索问题,提出了结合直接数字合成技术和极值搜索算法的设计方案。方案通过Matlab仿真进行验证,结果表明,该测试方法的测试精度可达0.1kHz。与传统测量方式相比,基于不对称方波调制的测试方法可以实现光纤陀螺本征频率的自动测试,测试精度高、速度快。

Auto-test method for FOG eigenfrequency based on asymmetric square wave modulation

A novel approach was presented to solve the problem of fiber optic gyro(FOG) eigenfrequency measuring. Based on the testing mechanism of FOG eigenfrequency, the paper adopted asymmetric square-waves to modulate Y-waveguide and analyze the demodulated signal. Then the relationship between the modulation frequency and the absolute value of adjacent pulses width difference is got. Thus the eigenfrequency measuring was transformed to the extremum searching. A scheme was put forward which combines the technique of direct digital synthesis and the algorithm of extremum searching. The scheme was tested by Matlab simulation, which shows that the accuracy is about 0.1 kHz, and the proposed auto-test method is more accurate and rapid compared with traditional approaches.