三轴一体轻小型光纤陀螺仪的时序设计

Timing for miniaturized three-cluster fiber optic gyro

由于光纤陀螺敏感环绕制过程中不能精确控制光纤长度,要求时序产生电路必须在不改动硬件的前提下能跟踪由敏感环光纤长度决定的光纤陀螺特征频率.利用相关检测理论,分析了调制解调信号频率准确度对陀螺标度因数误差的影响.针对三轴一体轻小型光纤陀螺仪,在满足现场可编程逻辑器件(FPGA)专用资源约束的条件下,使用一片FPGA完成了三轴调制解调信号时序的设计,并计算了其在中精度范围内跟踪特征频率的精度.实验结果表明:时序设计满足三轴一体轻小型光纤陀螺仪对调制解调信号频率准确度的要求.

Eigen frequency of fiber optic gyro （FOG） is determined by the length of fiber coil. Since the length cannot be controlled accurately while winding, timing generator should trace the eigenfrequeney expediently without modification of hardware. The influences signal on the scale factor of FOG was analyzed through of veracity and stabilization of modulation-demodulation the theory of correlation-based measurement. One chip of field programmable gate arrays （FPGA） was used to generate three timings of miniaturized three-cluster FOG within resource constraints, and the capacity of frequency tracing was calculated within the eigenfrequency range of middle precision FOG. Experimental results indicate that the timing scheme satisfied the requirement of miniaturized three-cluster FOG to modulation-demodulation signal.