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A closed-loop control method for fiber optic gyroscope

A technology of closed-loop control and fiber optic gyroscope, applied in the direction of Sagnac effect gyroscope, etc., can solve problems such as unsatisfactory noise suppression effect, bit error of analog-to-digital converter, increased gyro noise, etc., to improve noise suppression effect and Accuracy, removal of AD measurement error, and the effect of suppressing abnormal bit errors

Active Publication Date: 2021-11-23
浙江航天润博测控技术有限公司
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  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, in the traditional processing method, the default analog-to-digital converter is error-free; but in the actual system, due to the influence of the modulation signal (generating comb-shaped spikes), even if the suppression measures such as de-spike are adopted, the analog-to-digital converter Occasional bit errors still occur
Due to the characteristics of the closed-loop fiber optic gyroscope (the steady-state error is zero), occasional bit errors will not cause the gyroscope to open-loop or malfunction, but only increase the gyroscope noise
However, for higher precision applications, such noise can seriously affect its accuracy
[0010] Therefore, the existing closed-loop control method has the problem of unsatisfactory noise suppression effect

Method used

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  • A closed-loop control method for fiber optic gyroscope
  • A closed-loop control method for fiber optic gyroscope
  • A closed-loop control method for fiber optic gyroscope

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Embodiment

[0046] Example. A closed-loop control method for a fiber optic gyroscope, comprising the following steps:

[0047] In the first step, the optical path signal is driven by the post-amp modulation signal to form a comb-shaped voltage signal and enter the analog-to-digital converter AD;

[0048] The second step is to use the digital processor to perform sampling successively in two adjacent sampling periods P and S to obtain the corresponding sampling values; and perform consistency check on the collected sampling values ​​in the two sampling periods to remove the mutation point, get the phase error ΔV;

[0049] The third step is to integrate the phase error ΔV to generate a sawtooth wave;

[0050] The fourth step is to provide the generated sawtooth wave to the digital-to-analog converter DA;

[0051] The fifth step is to superimpose the square wave modulation signal into the digital-to-analog converter DA, and superimpose it with the sawtooth wave to form a ladder wave;

[...

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Abstract

The invention discloses a closed-loop control method for an optical fiber gyroscope, which comprises the following steps: the first step, the signal enters the AD; the second step, sampling is performed in two sampling periods P and S to obtain the sampling value; the sampling value is consistent In the third step, the phase error is integrated to generate a sawtooth wave; in the fourth step, the sawtooth wave is provided to the DA; in the fifth step, the square wave modulation signal is superimposed on the DA, Form a ladder wave; in the sixth step, the DA converts the ladder wave signal into a current / voltage signal, and applies it to the integrated optical modulator to realize the closed-loop control of the gyroscope; in the second step, the consistency check and removal of the collected signal The method of abrupt point processing: perform noise suppression processing on the sampling values ​​in two adjacent sampling periods P and S respectively, and obtain the sum respectively; then calculate the phase error according to the formula. The invention has the characteristics of effectively improving the noise suppression effect.

Description

technical field [0001] The invention relates to a control method for an optical fiber gyroscope, in particular to a closed-loop control method for an optical fiber gyroscope. Background technique [0002] Fiber optic gyroscope, as an all-solid-state fiber optic gyroscope, has been widely used in various fields such as military and civilian. The basic working principle of the fiber optic gyroscope is based on the Sagnac effect, that is, in a closed circular optical path, the light emitted by the light source is divided into two by the coupler, and the two beams of light propagate in the clockwise and counterclockwise directions respectively, and return to the coupled device position. When the circular light path rotates clockwise (or counterclockwise) relative to the inertial reference frame, the light waves propagating clockwise and counterclockwise experience different optical paths. By measuring the optical path difference, the relative Angular velocity of rotation in in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C19/72
CPCG01C19/72
Inventor 程文明王浩叶飞魏振兴耿铭陈文博唐长华
Owner 浙江航天润博测控技术有限公司
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