中国激光, 2007, 34 (6): 814, 网络出版: 2007-06-08
谐振式光纤陀螺数字闭环系统锁频技术
Frequency Locking Technique in Digital Closed-Loop Resonator Fiber Optic Gyro
光电子学 谐振式光纤陀螺 数字闭环系统 频率锁定技术 optoelectronics resonator fiber optic gyro digital closed-loop system frequency locking technique
摘要
谐振式光纤陀螺(R-FOG)是基于Sagnac效应产生的谐振频率差来测量旋转角速率的一种新型光学传感器。利用数字调制、解调技术实现陀螺系统的闭环锁定,可以克服模拟电路的热漂移,使系统更加简单灵活。以谐振频率偏差作为研究对象,提出了基于一阶惯性环节的最简闭环锁定分析模型。利用该简化模型,对数字闭环系统中的频率反馈跟踪技术进行了研究,得到了在一定积分时间常数下环路的最佳增益系数,实现了环路的快速、稳定锁定,并在实验中得到进一步的验证。
Abstract
Resonator fiber optic gyro (R-FOG) is a novel optical sensor whose resonant frequency is changed due to the Sagnac effect. The digital closed-loop operation can eliminate the thermal drift in analog circuits and it will make the R-FOG system more flexible. Taking the resonant frequency deviation as the research object, a simple analytical model for the closed-loop locking technique is presented based on one-order inertial loop operation. Frequency locking technique in the digital closed-loop operation system is then studied. The optimum loop gain is achieved under a certain integral time constant. Using above optimum parameters, the loop is locked quickly and stably. Furthermore, the analysis is verified by experiments.
杨志怀, 马慧莲, 郑阳明, 金仲和. 谐振式光纤陀螺数字闭环系统锁频技术[J]. 中国激光, 2007, 34(6): 814. 杨志怀, 马慧莲, 郑阳明, 金仲和. Frequency Locking Technique in Digital Closed-Loop Resonator Fiber Optic Gyro[J]. Chinese Journal of Lasers, 2007, 34(6): 814.