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谐振式光学陀螺中,利用三角波调制会引入过冲量,对陀螺的输出精度影响极大。对采用三角波调制技术对光电探测器输出方波信号的影响进行了理论推导及仿真,分析表明高次谐波是产生过冲噪声的主要因素。设计了一种含有可调低通滤波电路的光电探测器对高次谐波进行抑制,调制信号输入频率范围为400 kHz~1.8 MHz,将光电探测器截止频率分别设置为调制频率的1~1.5倍、3~3.5倍和6~8倍对光电探测器性能进行测试。结果表明,所设计的电路达到了消除过冲噪声的目的,最大可抑制16 dB左右的过冲噪声,尤其对2,3次等低倍频的谐波具有良好的抑制效果。
Resonant optical gyroscope, the use of triangular wave modulation will introduce overshoot, the gyro’s output accuracy greatly. The influence of the triangular wave modulation technology on the output square wave signal of the photodetector is theoretically deduced and simulated. The analysis shows that the higher harmonic wave is the main factor of generating the overshoot noise. A photodetector with adjustable low-pass filter circuit is designed to suppress the higher harmonics. The input frequency range of the modulated signal is 400 kHz ~ 1.8 MHz. The cutoff frequency of the photodetector is set to 1 ~ 1.5 Times, 3 ~ 3.5 times and 6 ~ 8 times to test the photodetector performance. The results show that the designed circuit achieves the purpose of eliminating the overshoot noise and can suppress the overshoot noise of about 16 dB at the maximum, especially for the harmonic with the second, third and third harmonic low harmonics.