Accurate closed-loop control scheme for fiber-optic gyroscope transit time

A time-of-flight, closed-loop control technology, applied in Sagnac effect gyroscopes, gyroscopes/steering sensing devices, measurement devices, etc., can solve the gyro output noise, zero bias and scale factor index degradation, large dispersion problems such as stability, low solution frequency, etc., to achieve the effect of improving long-term and instantaneous accuracy and reliability indicators
CN112240765APending Publication Date: 2021-01-19武汉中科锐择光电科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
武汉中科锐择光电科技有限公司
Publication Date
2021-01-19

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Abstract

The invention relates to an accurate closed-loop control scheme for fiber-optic gyroscope transit time. The accurate closed-loop control scheme comprises on-line real-time locking of fiber-optic gyroscope transit time parameters, two-stage feedback closed-loop control and four modulation waveform combination schemes given according to different design requirements. The main working process of themethod comprises the steps that high-frequency cosine wave modulation is applied to a phase modulator, spectral analysis is conducted on detector output, online real-time monitoring of the transit time is achieved through a digital phase locking scheme, real-time accumulation and rounding filtering processing are conducted on data, and the data are output to the next stage; a preliminary adjustment result is given through frequency division of control circuits such as an FPGA or a DSP, output of the adjustable crystal oscillator is controlled according to a further difference value, and feedback control with the precision superior to the ppm magnitude is achieved. The scheme is a third key parameter closed-loop control scheme after the fiber-optic gyroscope realizes rate closed-loop and phase modulation coefficient closed-loop, and has very important significance for stabilizing the scale factor and the zero offset parameter and improving the engineering performance of the fiber-opticgyroscope.
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Description

technical field

[0001] The invention belongs to the technical field of fiber optic gyroscopes, and in particular relates to a precise closed-loop control scheme of the transit time of fiber optic gyroscopes.

[0002] technical background

[0003] The fiber optic gyroscope is an all-solid-state gyroscope instrument based on the theory of relativity and quantum optics, which has extremely high reliability and design flexibility. The part of the fiber optic gyroscope that is sensitive to the rotational speed is called the fiber optic interferometer (including the splitter / combiner and the fiber optic ring), which is the sensing core of the fiber optic gyroscope. The time length of optical pulse propagation in the fiber optic interferometer is defined as the transit time of the fiber optic gyroscope, which is the basis for signal modulation and demodulation and closed-loop control of the fiber optic gyroscope, and is a key parameter in the design of the fiber optic gyroscope. ...

Claims

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