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提出了一种基于 DSP 芯片实现的双频率数字调制谐振式光纤陀螺系统的闭环检测方案。在此方案中,利用带通滤波器从探测器的输出光强信号中提取其基波频率的正弦信号,通过相关检测原理去掉干扰的噪声,并利用低通滤波器提取与探测器输出光强幅度直接成正比的直流信号,将其转换成相应的谐振频差,利用此频差即可求得陀螺的旋转角速度。此方案检测线路简单,操作方便,基于 DSP 芯片的实现则大大提高了系统处理速度。同时,还利用 Matlab 软件对检测系统中的滤波器参数进行了优化设计,提高了系统的检测精度。
A closed-loop detection scheme of dual frequency digital modulation resonant fiber gyroscope system based on DSP chip is proposed. In this scheme, a sinusoidal signal of the fundamental frequency is extracted from the output light intensity signal of the detector by using a band-pass filter, the interference noise is removed by the correlation detection principle, and the output light intensity of the detector is extracted by using a low-pass filter Directly proportional to the magnitude of the DC signal is converted into the corresponding resonant frequency difference, the use of this frequency difference can be obtained gyroscope angular velocity. This program detection line is simple, easy to operate, based on the realization of the DSP chip will greatly improve the system processing speed. At the same time, using Matlab software to optimize the filter parameters in the detection system to improve the detection accuracy of the system.