KEYWORDS: Fiber optic gyroscopes, Signal detection, Signal processing, Design, Optical circuits, Gyroscopes, Field programmable gate arrays, Digital signal processing, Miniaturization, Sensors
The signal processing circuit of the fiber optic gyroscope adopts a digital closed-loop processing scheme. It modulates the Y-waveguide integrated optical device through a D/A converter and its amplification circuit and demodulates the optical signals containing angular rate information via the detector signal processing circuit and A/D converter. The angular rate sensed by the fiber optic gyroscope is then calculated by a digital signal processing logic chip FPGA. Traditional fiber optic gyroscopes predominantly use imported components such as operational amplifiers, FPGAs, and A/D and D/A devices. In response to the urgent demand for gyroscopes with specific sizes and 100% domestic production, and with the gradual maturity of domestic integrated electronic components, the optimized design of the main control signal processing board, component selection, and the comprehensive application of flexible lamination technology have ensured that the accuracy and performance of the fiber optic gyroscope are maintained even with full domestic circuit production and reduced size.
Fiber optic gyroscope is an inertial measurement device, has been used in aviation, aerospace and navigation fields widely. It’s easy affected by the vibration noise in the surrounding environment and the application scene. The vibration causes the stress of the fiber ring to change, pigtail vibration of the optical device and the structure resonance of the fiber gyroscope, These changes will affect the performance indexes of the fiber gyroscope, such as zero bias and zero bias stability. Filter method is added to the data processing of fiber optic gyro in paper, and the vibration noise data is filtered by adaptive adjustment of filter parameters. To a certain extent, the influence of vibration and noise on the performance of fiber optic gyroscope is reduced, the zero bias drift is reduced, and the zero bias stability of fiber optic gyroscope is improved after filtering.
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