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.
resonant fiber-optic gyroscopebroadband light sourceangular random walkstrategic-level
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