Fiber-optic gyroscope temperature drift error compensation method

A fiber optic gyroscope and temperature drift technology, applied in the direction of measuring devices, instruments, etc., can solve problems such as unfavorable online real-time compensation, order underfitting, and complex algorithms, so as to reduce calculation and storage costs and improve accuracy , the effect of simple calculation process

Active Publication Date: 2018-01-23
BEIJING INST OF COMP TECH & APPL
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Problems solved by technology

The linear or polynomial model has a low order and is easy to underfit, and a high order is easy to overfit
Nonlinear modeling methods

Method used

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  • Fiber-optic gyroscope temperature drift error compensation method
  • Fiber-optic gyroscope temperature drift error compensation method
  • Fiber-optic gyroscope temperature drift error compensation method

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Embodiment Construction

[0024] In order to make the purpose, content, and advantages of the present invention clearer, the specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0025] The embodiment of the present invention proposes a method for compensating the temperature drift error of a segmented linear gyroscope based on a genetic algorithm. Based on the three variables of temperature, temperature field gradient and temperature change rate, the method establishes a gyro temperature drift model with piecewise linearization parameters, and uses genetic algorithm to optimize the selection of temperature section points in the model. The mechanism of this method is simple and effective, and it can realize high-precision modeling of the temperature model of the fiber optic gyroscope, and requires relatively little computation and less storage space, and is very suitable for online real-time com...

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Abstract

The invention relates to a fiber-optic gyroscope temperature drift error compensation method and belongs to the technical field of precision instruments. The effect of temperature, temperature variation rate and temperature field gradient on fiber-optic gyroscope temperature drift is fully considered, temperature piecewise linear fitting is performed on temperature coefficient, temperature variation rate coefficient and temperature gradient coefficient, and precision of a model is remarkably improved on the premise of not adding the number of orders of the system model. The number of temperature piecewise points is optimally selected by adopting a genetic algorithm, the piecewise points are selected as few as possible on the basis of giving consideration to the precision of the model, andgeneralization of the model can be improved; the number of the orders is smaller than or equal to 2-order, simpleness in parameter calculation procedure is achieved, training time like neural networksis not needed, order determination of the polynomial model is not needed, and difficulty in modeling is remarkably reduced; meanwhile, the calculated amount in real-time compensation and storage costare greatly reduced.

Description

technical field [0001] The invention relates to the technical field of precision instruments and meters, in particular to a method for compensating an optical fiber gyroscope temperature drift error. Background technique [0002] Optical fiber gyro is an angular rate measuring instrument based on the Sagnac effect. Because of its simple structure, impact resistance, and large dynamic range, it is widely used in aerospace, robot control, oil drilling and other fields. However, the performance of fiber optic gyroscopes is easily affected by temperature. How to reduce the temperature effect is a difficult problem that must be overcome in the engineering process of fiber optic gyroscopes. [0003] At present, the measures to improve the temperature performance of the fiber optic gyroscope from the mechanism include: improving the fiber optic wrapping technology, improving the glue fixing process, improving the characteristics of the glue, optimizing the thermal design of the str...

Claims

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Application Information

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IPC IPC(8): G01C25/00
Inventor 邓学文李贺李敏朱奎宝
Owner BEIJING INST OF COMP TECH & APPL
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