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Multi-phase modulation and demodulation fiber-optic gyroscope multi-closed-loop algorithm

A fiber optic gyroscope and polyphase modulation technology, applied in Sagnac effect gyroscopes and other directions, can solve the problem of lack of real-time control of multiple closed-loop algorithms, and achieve the effect of improving measurement performance and accuracy

Active Publication Date: 2020-05-19
ZHEJIANG UNIV
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Problems solved by technology

The prior art lacks such a multi-closed-loop algorithm for real-time control

Method used

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  • Multi-phase modulation and demodulation fiber-optic gyroscope multi-closed-loop algorithm
  • Multi-phase modulation and demodulation fiber-optic gyroscope multi-closed-loop algorithm
  • Multi-phase modulation and demodulation fiber-optic gyroscope multi-closed-loop algorithm

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Embodiment Construction

[0071] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0072] The corresponding curves of phase and light intensity in the fiber optic gyro interferometer are as follows figure 1 , in the fiber optic gyroscope, there is still a certain phase difference between the two beams of the interferometer under the condition of zero rotational speed input by means of phase bias; Wave modulation and demodulation) In the digital closed-loop fiber optic gyroscope, the bias points are selected symmetrically, such as A and D, B and E, C and F in the figure, these three pairs of bias points are relatively symmetrical with respect to 0, and the phase amplitudes are the same , with the opposite sign.

[0073] Through the detection of the light intensity of a pair of bias points, the solution of the angular velocity can be realized (in the closed-loop fiber optic gyroscope, the settlement of the closed-loop residual error of the a...

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Abstract

The invention discloses a multi-phase modulation and demodulation fiber-optic gyroscope multi-closed-loop algorithm. The modulation waveform of the fiber-optic gyroscope is reasonably designed, a plurality of phases are obtained through division in a modulation and demodulation period, different modulation amplitudes are realized on different phases and gyroscope output signals in the time periodare sampled, demodulation of parameters such as angular rate, half-wave voltage parameters, signal intensity and the like is realized by combining different closed-loop processing methods and the multi-parameter multi-closed-loop is realized. According to the fiber-optic gyroscope multi-closed-loop algorithm, the linearity, the bias stability and the like of the fiber-optic gyroscope are improved,existing hardware does not need to be added or changed, the working state of the fiber-optic gyroscope is monitored in real time through the modulation and demodulation method and the reliability isimproved.

Description

technical field [0001] The invention relates to the problem of how to simultaneously realize the modulation and demodulation of multiple parameters in the signal processing method of the fiber optic gyroscope, in particular to a multi-closed-loop algorithm of the fiber optic gyroscope for multiphase modulation and demodulation. Background technique [0002] Fiber optic gyroscope is a new type of angular rate measuring instrument, which is widely used in navigation and attitude control systems due to its advantages of all solid state, wide bandwidth and digital output with multiple protocols. The working principle of the fiber optic gyro is a fiber optic interferometer based on the optical Sagnac effect, that is, when the ring interferometer rotates, a Sagnac phase difference (also often called Sagnac Phase shift or Sagnac phase), by detecting the phase difference, combined with the pre-measured scale factor, the angular velocity of the system where the ring interferometer is...

Claims

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Application Information

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IPC IPC(8): G01C19/64
CPCG01C19/64
Inventor 陈杏藩李楠胡慧珠刘承
Owner ZHEJIANG UNIV
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