Fiber-optic gyroscope zero offset determination method

Abstract

The invention relates to a fiber-optic gyroscope zero offset determination method. The method comprises the following steps: S1, obtaining a zero-bias temperature rise model table and a zero-bias temperature drop model table under a preset temperature change rate; s2, querying a zero-bias heating model table and a zero-bias cooling model table, and obtaining a heating zero-bias value and a cooling zero-bias value corresponding to the current environment temperature of the tested fiber-optic gyroscope; s3, calculating a zero-bias heating model weight and a zero-bias cooling model weight corresponding to the current temperature; and S4, carrying out weighted operation on the temperature rise zero-bias value and the temperature drop zero-bias value corresponding to the current temperature obtained in the step S2, and finally obtaining the gyroscope zero-bias value of the fiber-optic gyroscope at the current environment temperature and the temperature change rate. The weighted zero-bias compensation value can be calculated in real time according to the temperature, the temperature rising and falling trend and the temperature change rate, the problem that a traditional zero-bias compensation method is poor in environmental adaptability is solved, and the method is suitable for zero-bias modeling and compensation of fiber-optic gyroscopes of different models or precisions.

Description

technical field [0001] The invention relates to a method for determining the zero bias of an optical fiber gyroscope, which belongs to the technical field of optical fiber gyroscopes. Background technique [0002] Gyroscopes are an essential part of inertial systems and are used to measure the angular velocity of a vehicle. Compared with traditional mechanical gyroscopes, fiber optic gyroscopes are designed based on the Sagnac effect without any moving parts. Therefore, this new all-solid-state gyroscope has many advantages such as small size, light weight, high precision, low cost, high reliability, and long life, and has been widely used in military and civilian fields. Fiber optic gyroscopes are sensitive to changes in ambient temperature, and will produce non-reciprocal phase errors with changes in ambient temperature, which will cause the zero position of the fiber optic gyroscope to drift. Therefore, it is necessary to compensate for the drift of the fiber optic gyro...

AI Technical Summary

Problems solved by technology

Since the change trend of the gyro bias in the full temperature range is not only related to the current temperature situation, but also closely related to the temperature rise and fall trend and the temperature change rate, the traditional method of static temperature compensation or single variable temperature modeling method is obtained The data has problems such as single compensation factor, limited use environment, poor adaptability, etc.

Although some methods take into account the influence of temperature change trend and temperature change rate on gyroscope bias, there are problems such as complex modeling methods, high time cost, and poor practicability.

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