Optical fiber peg-top transition time on-line precise measuring method

Abstract

The invention discloses an on-line precision measurement method of the transition time of an optical fiber gyro. A phase modulator is used for performing a square wave phase modulation to a system, the amplitude of a modulation square wave is not equal to the integral multiple of half of the phase modulator half wave voltage, and the circle is two times larger than an estimated value of the measured optical fiber gyro transition time; an analogtodigital converter is used for performing an analogdigital conversion to an output signal under the square wave modulation, a numerical electrical level vale value of a corresponding sampling point is obtained by sampling, and a sampling sequence is composed of the result of a plurality of sampling conversions; a binaryzation filtering is performed by a sampling sequence, the binaryzation filtering result sequence corresponding to the optical fiber gyro output signal is obtained, and the optical fiber gyro transition time is obtained by the numerical value calculation precision in combination with a modulation square wave circle. The effective on-line precision measurement of an optical fiber gyro transition time of the invention provides a basis for the circle of a system accurate selection modulating signal, the zero deviation caused by the deviation of the transition time is eliminated, various noise sources are restrained, the reduction of the long term drift of the optical fiber gyro is reached, and the static accuracy and the resolution are improved.

Description

technical field [0001] The invention relates to a signal processing method in an optical fiber gyroscope sensor, in particular to an online precision measurement method for the transit time of an optical fiber gyroscope. Background technique [0002] The transit time of the fiber optic gyroscope is the time required for light to propagate in the reciprocal optical path of the fiber optic gyroscope for one week, and its reciprocal is called the characteristic frequency of the fiber optic gyroscope, and the transit time can also be called the characteristic period of the fiber optic gyroscope. [0003] Medium and high-precision fiber optic gyroscopes adopt a digital closed-loop solution, which modulates the system through a phase modulator, and converts the signal of the fiber optic gyroscope into digital quantities through an analog-to-digital converter, and performs modulation and demodulation processing through a controller. The phase modulator plays two roles: it performs ...

AI Technical Summary

Problems solved by technology

[0006] The suppression effect of phase modulation on noise and drift is a complex subtractive function relationship with the error of the half cycle and transit time of the modulated signal. As the error increases, the suppression effect becomes worse and worse. When the error reaches a certain length The inhibitory effect basically disappears when

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