谐振式光学陀螺三角波调制过冲噪声的抑制  

Suppression of the Triangular Wave Modulation Overshoot Noise for Resonant Optical Gyros

作　　者：闫徐林 郑永秋[1,2] 张成飞[2] 闫树斌[1,2] 

机构地区：[1]中北大学电子测试技术重点实验室,太原030051 [2]中北大学仪器科学与动态测试教育部重点实验室,太原030051

出　　处：《微纳电子技术》2016年第7期456-460,共5页Micronanoelectronic Technology

基　　金：国家杰出青年基金资助项目(51225504);国家自然科学基金资助项目(61275166)

摘　　要：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。The triangle wave modulation in the resonator optic gyro will cause overshoot,which will greatly effect on the output accuracy of the gyro.The influence of the triangle wave modulation technology on the photodetector output square wave signal was theoretically derived and simulated.The results show that the higher harmonic is the main factor of the overshoot noise.A photodetector with a tunable low-pass filter circuit was designed to suppress the higher harmonic.The input frequency range of the modulation signal is between400 kHz and 1.8 MHz.The cut-off frequency of the photodetector is set as 1-1.5,3-3.5 and 6-8 times of the modulation frequency to test the performances of the photodetector.The results show that the designed circuit can eliminate the overshoot noise.The maximum restrained overshoot noise can reach about 16 dB,and the 2nd,3rd harmonics at low frequency can also be commendably suppressed by the photodetector especially.

关 键 词：谐振式光学陀螺 三角波调制 过冲噪声 谐波 光电探测器 抑制 

分 类 号：TH703[机械工程—仪器科学与技术]