Calibration method for fiber-optic gyroscope inertial measurement device with three orthogonalized axes and one inclined axis

Abstract

The invention comprises a calibration method for a fiber-optic gyroscope inertial measurement device with three orthogonalized axes and one inclined axis, particularly relates to a system calibration system for navigating, guiding and controlling a spacecraft, and belongs to the technical field of inertial measurement. The calibration method is used to accurately calibrate the zero position, the scale factor and the installing error of the fiber-optic gyroscope inertial measurement device, and the method is simple and feasible and can effectively increase the calibration accuracy. According to the method, no tool needs to be replaced, so as to guarantee the consistency of a datum plane; the method does not distinguish the scale factor and the installing error, so that the calculation error produced when calculating the small quantity of the installing error is avoided; and compared with other testing methods for the fiber-optic gyroscope inertial measurement device, the method is simple and feasible, improves the calibration efficiency and saves the manpower and material resources.

Description

technical field [0001] The invention relates to a calibration method for an inertial measurement device of a fiber optic gyroscope, in particular to a miniaturized, highly reliable, multi-table redundant fiber optic gyroscope inertial measurement device for spacecraft navigation, guidance and control, and belongs to the technical field of inertial measurement . Background technique [0002] As a symbol of high-tech development, satellites play an extremely important role in my country's national defense and economic construction. Attitude determination accuracy is a prerequisite for satellites to obtain information stably and effectively. Satellite attitude control system is one of the important systems to ensure satellite attitude accuracy , and the inertial device is an extremely critical sensor in the satellite attitude control system, which directly affects the accuracy and performance of the attitude control system. [0003] The fiber optic gyroscope is an all-solid-sta...

AI Technical Summary

Problems solved by technology

[0004] The existing calibration technology is to obtain the scale factor, zero position, and installation error parameters through separate calibration of each axis, which is time-consuming and laborious; during the calibration process, the full-turn processing is not performed, resulting in the northward ground speed not being eliminated, which affects the calibration results , the calibration method has defects; the calibration calculation process deducts the output when the turntable is stationary, and this method also has defects: because there is a certain error angle between the measured axis and the input axis of the turntable, the output of the measured axis when the turntable is stationary contains the Axial zero position, sky-to-ground velocity component ω u ·cosα and the projected amount ω of the north component of ground speed on this axis generated by the error angle n · sin(α) · cos(β), β is the angle between the projection of the axis in the horizontal direction and the north direction, if it is directly deducted, the result will have a north direction component error ω n · sin(α) · cos(β)

This calibration method needs to replace the hexahedron tooling with an oblique tooling when calibrating the inclined axis, which leads to the inconsistency of the datum plane and causes errors

The calibration method itself has defects: due to a certain error angle between the measured axis and the input axis of the turntable, the output at rest includes the zero position of the gyro, the ground velocity and the celestial component ω u and the projected amount of the northward component of the ground speed generated by the error angle on this axis, if directly deducted, there will be a constant value error of the northward component in the result; at the same time, because the existing calibration process has not been processed by a full circle, the northward ground speed is not correct. Elimination, affecting the calibration results

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