Signal Processing System Of Digital Close Loop Fiber Optic Gyrosystem

An all digital close loop fiber optic gyrosystem has some merits such as linear scale factor, high degree of detecting accuracy, broad dynamic range. Adopting all digital close loop scheme, we can make up superior performance Fiber optic gyrosystem by imperfection components. All digital Close Loop scheme is an ideal scheme for Interferometric fiber optic gyrosystem.This paper focuses on the method of signal processing of digital closed loop fiber optic gyros (FOG), and gives a detailed analysis. Electric circuit system for all digital close loop scheme is determined by theoretical analysis. An all digital close-loop fiber optic gyroscope system based on DSP is presented. An electric circuit system of signal detecting and processing for all digital close loop scheme are designed. Four hardware components are detail designed: (1) Central processing unit; (2) The part for modulation signal; (3) Signal amplified and sampled unit; (4) Signal output part. Sequential logic between each part is presented, program flow diagram is presented too. The software real-time running in DSP corrects non-linearly error of this system.Experimental result proves that this electric circuit system of signal detecting and processing and homologus software can be used for all digital close loop scheme. AD and DA converter is able to accurately working in step, namely the high stability of modulation wave and sampling at optimally time.In the end, the measurement methods of two important parameters (transit-time r and half-wave voltage of LiNbO₃ Multi-function Integrated Optical Device) are presented. Finally, by analyzing the problems from experiment, some solving-means are presented.