Online automatic tracking method for eigenfrequency of fiber optic gyroscope

An eigenfrequency and fiber optic gyro technology, which is applied to Sagnac effect gyroscopes, measuring devices, instruments, etc., can solve problems such as online tracking and achieve the effect of eliminating jitter

Inactive Publication Date: 2019-05-07
BEIHANG UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to realize high-precision online automatic tracking of the eigenfrequency of the fiber optic gyroscope, and to solve the problem of online tracking of the eigenfrequency after the gyroscope is turned on after long

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  • Online automatic tracking method for eigenfrequency of fiber optic gyroscope
  • Online automatic tracking method for eigenfrequency of fiber optic gyroscope
  • Online automatic tracking method for eigenfrequency of fiber optic gyroscope

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Embodiment Construction

[0024] The present invention will be further described in detail with reference to the accompanying drawings and embodiments.

[0025] Such as figure 1 Shown is an on-line automatic tracking device for the eigenfrequency of a fiber optic gyroscope provided by the present invention, including a light source, a fiber optic coupler, an integrated optical phase modulator, a fiber optic sensitive ring, a photodetector, a preamplifier, and an analog-to-digital converter (ADC), logic processor, digital-to-analog converter (DAC), buffer amplifier, and crystal oscillator. Said light source, fiber coupler, integrated optical phase modulator and fiber sensitive ring form a Sagnac (Sagnac) interferometer. The fiber coupler is a four-port device, the first port is connected to the light source, the second port is connected to the first input end of the integrated optical phase modulator, the third port is connected to the photodetector, and the fourth port is suspended; the integrated opt...

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Abstract

The invention discloses an online automatic tracking method for an eigen frequency of a fiber optic gyroscope, and belongs to the technical field of fiber optic gyroscopes. Based on an eigen frequencymeasurement in an open-loop offline state, a relation model of an error amount of the online extracted gyro modulation signal frequency deviating from the eigen frequency and the eigen frequency is established, and a scheme that carries out seamless switching and adjusting double clocks of time division multiplexing modulation and modulation signal frequency on a closed-loop fiber optic gyroscopeare designed on a premise of not influencing normal angular velocity demodulation of the closed-loop gyroscope. According to the online automatic tracking method for the eigen frequency of the fiberoptic gyroscope, the error amount of the modulation frequency deviating from the eigen frequency is extracted, fed back and adjusted under the premise of not influencing the angular velocity demodulation of a main closed-loop circuit. Moreover, jitter that can be caused in a switching process can be eliminated, compensation for a scale factor of fiber optic gyroscope with high precision is provided.

Description

technical field [0001] The invention belongs to the technical field of fiber optic gyroscopes, in particular to a method for online automatic tracking of the eigenfrequency of fiber optic gyroscopes, and is particularly suitable for high-precision fiber optic gyroscopes that are turned on after long-term storage. Background technique [0002] The interferometric fiber optic gyroscope has been widely used in the field of inertial angular velocity due to its all-solid-state structure, small size, and low cost. [0003] The scale factor is an important parameter of the fiber optic gyroscope. Compared with the laser gyroscope, the fiber optic gyroscope has an obvious disadvantage, which is its poorer scale factor characteristics. With the improvement of gyroscope accuracy, many deep-seated technical problems began to be exposed. Fiber optic gyroscopes must have accurate scale factors. Under the action of multi-physics, there are problems in the repeatability and long-term main...

Claims

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Application Information

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IPC IPC(8): G01C19/72G01C25/00
Inventor 潘雄代琪宋凝芳王夏霄熊瑞张少博郝帅
Owner BEIHANG UNIV
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