Closed-loop detection method for optimizing detection precision of fiber-optic gyroscope

Abstract

The invention discloses a closed-loop detection method for optimizing the detection precision of a fiber-optic gyroscope. The closed-loop detection method comprises the following steps of: 1, establishing a mathematical model of a fiber-optic gyroscope system based on four-state modulation; 2, establishing and analyzing a main closed-loop mathematical model; 3, introducing a linear feedback controller, and establishing a system dynamics model; and 4, designing a feedback gain matrix Kc of a controller for optimizing the performance of the fiber-optic gyroscope so as to improve the detection precision of the fiber-optic gyroscope. By adopting the method disclosed by the invention, the detection precision of the fiber-optic gyroscope can be improved. The method not only can optimize the detection precision in engineering application, but also has a certain reference value for the design of the fiber-optic gyroscope.

Description

technical field [0001] The invention belongs to the technical field of fiber optic gyroscopes, and relates to a closed-loop detection method for optimizing precision measurement accuracy of fiber optic gyroscopes. Background technique [0002] Fiber optic gyro is an angular velocity sensor based on the optical Sagnac effect. Its development is changing with each passing day. It has attracted the attention and attention of various countries for its advantages of simple structure, small size, high sensitivity, and low power consumption. It also has extensive development in various fields. prospect. However, the existence of the gain drift problem of the integrated optical phase modulator will also affect the accuracy of the fiber optic gyroscope, thus limiting the engineering application of the fiber optic gyroscope. [0003] In the prior art, the tracking system of the second closed-loop system is used to automatically adjust the gain of the integrated optical phase modulato...

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Problems solved by technology

However, the existence of the gain drift problem of the integrated optical phase modulator will also affect the accuracy of the fiber optic gyroscope, thus limiting the engineering application of the fiber optic gyroscope

[0003] In the prior art, the tracking system of the second closed-loop system is used to automatically adjust the gain of the integrated optical phase modulator. When the traditional square wave modulation is used for detection, the closed-loop period of the second closed-loop depends on the reset of the main closed-loop feedback phase slope. The efficiency of this method is low; although the method of four-state modulation can make the second closed-loop period constant and not affected by the reset of the feedback phase ramp, the cross-coupling of the two closed-loop errors will reduce the accuracy of the fiber optic gyroscope, especially In practical applications, the main closed-loop error of the fiber optic gyroscope is a weak signal that is sensitive to interference and noise, making it difficult to improve the detection accuracy of the fiber optic gyroscope

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