Quick measuring method for fiber-optic gyroscope transition time based on digital sawtooth wave

Abstract

The invention discloses a quick measuring method for fiber-optic gyroscope transition time based on digital sawtooth wave. An electrooptical modulator is modulated by digital sawtooth wave signals, the sawtooth wave signals are traversed in a periodical value range one by one in a progressive increasing mode, modulation results of sawtooth wave signals in different periods are sampled and processed to form a result sequence, an initial measuring result is calculated out according to the period of the sawtooth wave signals corresponding to the minimum value in the result sequence, a second periodical value range is set according to the initial measuring result, the above steps are repeated to obtain a second measuring result sequence, and a second measuring result is calculated according to the period of the sawtooth wave signal corresponding to the minimum value of the second measuring result sequence to obtain a final fiber-optic gyroscope transition time. The quick measuring method can quickly test the fiber-optic gyroscope transition time without adding testing equipment or periods, solves the problem of transition time change caused by adjusting an optical system in a fiber-optic gyroscope producing process and flexibly meets engineering and batching production of fiber-optic gyroscopes.

Description

technical field [0001] The invention relates to a processing method of an optical fiber gyroscope signal, in particular to a method for rapidly measuring the transit time of an optical fiber gyroscope based on a digital sawtooth wave. 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 electro-optical modulator, and the analog-to-digital converter converts the output analog voltage signal of the fiber optic gyroscope into a digital signal. Perform differential demodulation processing. The electro-optic modulator has two main functions: time-delay differential modulation, changing the working bias point of the fiber optic gyroscope to improve sensitivity and linear...

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Problems solved by technology

[0005] Aiming at the accurate measurement of time of flight in the current engineering production of medium and high precision fiber optic gyroscopes, and solving the problem of time of flight changes caused by optical system adjustments in the production process, the purpose of this invention is to provide a fiber optic gyroscope based on digital sawtooth waves Rapid measurement method of transit time

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