摘要
针对谐振式光学陀螺(ROG)由于系统延时导致灵敏度降低的问题,在正弦波调制的基础上,分析了延时来源与影响,设计了轻量高效的数字式正交锁相放大器。在不涉及任何光路、电路硬件改动的前提下,通过增加一路相位差为90°的同步方波解调进行正交运算,利用勾股定理消除系统延时,并通过逻辑赋值、移位运算提升响应速度和兼容性。理论分析和仿真结果表明,同频同幅方波解调输出是正弦波解调输出的4/π倍,陀螺的灵敏度可提高27.3%。实验结果表明,采用正交锁相放大器后,系统延时减小了1.5μs,陀螺灵敏度进一步提高了11.8%,且具备良好的鲁棒性。
A lightweight and efficient digital quadrature lock-in amplifier is designed to address the problem of sensitivity degradation due to system delay in resonant optical gyros(ROG),and the sources and effects of delay are analyzed on the basis of sinusoidal modulation.Without involving any optical and circuit hardware changes,the quadrature operation is performed by adding one way of synchronous square wave demodulation with a phase difference of 90°,the system delay is eliminated by the collinearity theorem,and the response speed and compatibility are improved by logic assignment and shift operation.Theoretical analysis and simulation results show that the output of square wave demodulation with same frequency and amplitude is 4/π times that of sinusoidal demodulation output,and the sensitivity of gyro can be increased by 27.3%.The experimental results show that the system delay is reduced by 1.5μs and the gyro sensitivity is further increased by 11.8%with good robustness.
作者
王国臣
赵佳祺
夏秀玮
王梓丞
王沐禹
李羚宇
WANG Guochen;ZHAO Jiaqi;XIA Xiuwei;WANG Zicheng;WANG Muyu;LI Lingyu(School of Instrumentation Science and Engineering,Harbin Institute of Technology,Harbin 150001,China)
出处
《中国惯性技术学报》
北大核心
2025年第1期70-75,共6页
Journal of Chinese Inertial Technology
基金
国家自然科学基金(52271315,51909048)
黑龙江省自然科学基金(YQ2023F013)。
关键词
谐振式光学陀螺
灵敏度
正交锁相放大器
调制解调
resonant optical gyro
sensitivity
quadrature lock-in amplifier
modulation and demodulation
作者简介
王国臣(1987-),男,教授,从事光纤陀螺技术研究;通讯作者:夏秀玮(1987-),男,助理研究员。从事惯性导航仪器、惯性/组合导航技术研究。
