Device and method for real-time tracking of transit time of fiber optic gyroscope

Abstract

The invention discloses a real-time tracking device and a real-time tracking method of transition time of an optical fiber gyroscope. The real-time tracking method comprises the following steps: arranging a voltage-controlled crystal oscillator in the optical fiber gyroscope, and adding a digital-to-analog conversion module; connecting the digital-to-analog conversion module between the voltage-controlled crystal oscillator and a digital signal processor; performing phase modulation on the digital signal processor; performing sampling before and after the edge moment of the modulation step; sequentially performing pulse net area extraction, four-step perturbation demodulation, integration, four-step perturbation modulation and digit truncation to obtain an operation result, and outputtingthe operation result to an analog-to-digital converter; and controlling the traction voltage of the voltage-controlled crystal oscillator to enable the duration time of a single phase modulation stepto be changed in real time so as to realize tracking. The device and the method disclosed by the invention enable the absolute value of relative deviation between the duration time and the transitiontime of the single phase modulation step to be not greater than 10PPM, and are suitable for different application occasions; hardware changes are few, the complexity of an algorithm is low, requirements for modulation waveforms are few, and the algorithm can be conveniently integrated to other algorithms; and the device and the method have practical application values and can greatly improve the measuring performance of the optical fiber gyroscope.

Description

technical field [0001] The invention relates to a fiber optic gyro signal processing device and method, in particular to a real-time tracking device and method for the transit time of a fiber optic gyro. Background technique [0002] The time required for light to propagate for one week in the reciprocal optical path of the fiber optic gyroscope is called the transit time. At present, digital closed-loop technology is mostly used in the field of medium and high-precision fiber optic gyroscope research at home and abroad. The fiber optic gyroscope is modulated by an integrated photoelectric phase modulator, and the analog-to-digital converter converts the output analog voltage signal of the fiber optic gyroscope into a digital signal. The signal processor performs differential demodulation processing. The integrated photoelectric phase modulator mainly plays two roles: it performs time-delay differential modulation on the optical system and changes the working bias point of ...

AI Technical Summary

Problems solved by technology

[0005] In view of the current research on fiber optic gyroscopes, when the temperature and other factors in the environment change, the relative deviation between the duration of a single modulation step and the transit time in the modulation waveform cannot be small enough to effectively suppress the zero offset of the gyroscope output. The invention proposes a real-time tracking device and method for the transit time of a fiber optic gyroscope

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