On-line tracking method and system for eigenfrequency of fiber-optic gyroscope

A fiber optic gyroscope and eigenfrequency technology, which is applied to Sagnac effect gyroscopes, measuring devices, instruments, etc., can solve the problem of not being able to track the actual eigenfrequency of fiber optic gyroscopes.

Active Publication Date: 2021-04-23
HUBEI SANJIANG AEROSPACE HONGFENG CONTROL
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Problems solved by technology

[0004] Aiming at at least one defect or improvement requirement of the prior art, the present invention provides an online tracking method and system for the eigenfrequency of the fiber ...

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  • On-line tracking method and system for eigenfrequency of fiber-optic gyroscope
  • On-line tracking method and system for eigenfrequency of fiber-optic gyroscope
  • On-line tracking method and system for eigenfrequency of fiber-optic gyroscope

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Embodiment Construction

[0049] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0050] The working principle of the urban rail transit self-healing power supply method and system provided by the present invention will be described in detail below with reference to the embodiments and the accompanying drawings.

[0051] An online tracking method for the eigenfrequency of a fiber optic gyroscope, the method comprising:

[0052] The obtained eigenfrequency of the fiber optic ...

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Abstract

The invention discloses an on-line tracking method and system for eigenfrequency of a fiber-optic gyroscope. The fiber-optic gyroscope comprises an ASE light source, an optical fiber coupler, an integrated optical phase modulator and a light sensitive ring which are connected in sequence, the feedback end of the optical fiber coupler sequentially passes through the photoelectric detector, the pre-amplifier and the analog-to-digital converter and then is input to the signal receiving end of the logic processor, and the control end of the integrated optical phase modulator sequentially passes through the buffer amplifier and the digital-to-analog converter and then is connected to the signal sending end of the logic processor. The method comprises the following steps: constructing a modulation signal obtained by superposing a four-state square wave and a sawtooth wave, transmitting the modulation signal through a closed-loop control loop of the fiber-optic gyroscope to obtain a to-be-demodulated signal, demodulating an error between a modulation frequency and an actual frequency of the fiber-optic gyroscope, and dynamically adjusting a modulation frequency source clock of the fiber-optic gyroscope. Therefore, automatic tracking of the eigenfrequency of the fiber-optic gyroscope is realized, an angular velocity closed loop and a half-wave voltage closed loop are not influenced, and the precision of an angular velocity channel of the fiber-optic gyroscope is not influenced.

Description

technical field [0001] The invention belongs to the technical field of fiber optic gyroscopes, and more specifically relates to an online tracking method and system for the eigenfrequency of a fiber optic gyroscope. Background technique [0002] The fiber optic gyroscope is an angular rate sensor based on the Sagnac effect. Due to its low cost, simple process, high reliability, and strong shock and vibration resistance, its application prospects have attracted much attention and it has become one of the mainstream sensors. High-precision fiber optic gyroscopes generally use four-state square wave overmodulation technology to bias the fiber optic gyroscope, and the four-state square wave modulation frequency is required to be consistent with the actual eigenfrequency of the fiber optic gyroscope. But in the existing fiber optic gyro, the modulation frequency is set according to the eigenfrequency measured at room temperature. [0003] During the temperature change process of...

Claims

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Application Information

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IPC IPC(8): G01C19/72G01C25/00
Inventor 张庆伟陈地邓卫林
Owner HUBEI SANJIANG AEROSPACE HONGFENG CONTROL
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