宽谱光源驱动的高精度谐振式光纤陀螺
High-precision resonant fiber-optic gyroscope interrogated with broadband light source
马慧莲 1李斌杰 1胡俊熠 1刘霜 1王宇欣 1杨志怀2
作者信息
- 1. 浙江大学 航空航天学院,杭州 310027
- 2. 浙江航天润博测控技术有限公司,杭州 310002
- 折叠
摘要
针对高精度惯性导航系统对高精度小型化光纤陀螺的发展需求,开展了宽谱光源驱动的谐振式光纤陀螺(RFOG)技术研究.首先介绍了宽谱谐振式光纤陀螺的工作原理,对比分析了该种陀螺在角度随机游走上相对于发展较为成熟的干涉式光纤陀螺的优势;讨论了受散粒噪声制约的理论角度随机游走的影响因素,并结合光纤耦合器的损耗系数和谐振腔内的光纤传输损耗,对耦合器的耦合系数进行了优化设计,获得了宽谱RFOG系统的最佳角度随机游走理论值;利用优化后的耦合系数,设计并研制了总长为 1020 m、内径为 15 cm的透射式光纤环形谐振腔,并完成了宽谱RFOG系统的研制和测试.测试结果表明,陀螺角度随机游走为 2.1×10-4(º)/h1/2,零偏不稳定性为 4.6×10-4(º)/h,达到了战略级陀螺的精度范围.
Abstract
Aiming at the development of a high-precision inertial navigation system for a high-precision miniaturized fiber-optic gyroscope,a resonant fiber-optic gyroscope(RFOG)interrogated with a broadband light source is studied.Firstly,the working principle of the broadband source-driven RFOG is presented,and the advantages of this type of gyroscope in the angular random walk(ARW)relative to the matured interferometric fiber-optic gyroscope are compared and analyzed.Subsequently,the factors that affect the theoretical ARW limited by shot noise,are discussed.The optimal design of the coupling coefficient of the fiber-optic coupler is then carried out by combining the loss coefficient of the coupler with the fiber-optic transmission loss within the fiber-optic ring resonator,and the best theoretical ARW for the broadband source-driven RFOG is obtained.Utilizing the optimized coupling coefficient,a transmissive fiber-optic ring resonator with a total length of 1020 meters and an inner diameter of 15 centimeters is designed and fabricated.The fabrication and testing of the broadband RFOG system are completed.Test results indicate that the measured ARW is 2.1x10-4(º)/h1/2 and the bias instability is 4.6x10-4(º)/h,which meet the precision requirements for strategic-level gyroscopes.
关键词
谐振式光纤陀螺/宽谱光源/角度随机游走/战略级Key words
resonant fiber-optic gyroscope/broadband light source/angular random walk/strategic-level引用本文复制引用
基金项目
浙江省自然科学基金资助项目(LZ23F050004)
出版年
2024
NETL
NSTL
万方数据