Online automatic tracking method for eigenfrequency of fiber optic gyroscope

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...

AI Technical Summary

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-term storage. Based on the relationship model between the quantity and the eigenfrequency, design a scheme to adjust the modulation signal frequency of the closed-loop FOG without affecting the normal angular velocity demodulation of the closed-loop gyroscope

Images