Ground velocity projection component error self-calibration method of ring laser angle measuring device

Abstract

The invention belongs to the ring laser technique for measuring angles, and relates to a ground velocity projection component error self-calibration method of a ring laser angle measuring device. The method includes the steps that by using a least square method, the angle information from a circle inductosyn arranged on a measured turntable is combined with the angle information from the ring laser angle measuring device, and by using discrete treatment separating, error terms are separated, so as to eliminate the angle measuring errors introduced by the ground velocity projection component. The ring laser angle measuring device has the advantages that the accuracy is high in a short time and the angle errors of the turntable do not diverge with the time, and by using the advantages adequately, the measuring errors caused by the ground velocity projection component can be reduced successfully, thereby obtaining the angle and angular velocity information with higher accuracy and smaller noise.

Description

technical field [0001] The invention belongs to the ring laser angle measurement technology, and relates to a method for self-calibrating the ground speed projection component error of a ring laser angle measurement device. Background technique [0002] Angle measurement is an important part of geometric measurement technology, especially high-precision dynamic angle calibration. For example, in the fields of CNC machine tools, high-precision turntables, satellite antennas, and remote telescopes, there are situations that require both static positioning accuracy and stability. Rotational dynamics, that is, the problem of angular position accuracy at relatively high rates of rotation. Previously, the high-precision measurement of the characteristics of the turntable usually uses an optical code disc or a method based on an autocollimator, but the former has limited accuracy and cannot measure the dynamic characteristics of angular rotation, while the latter has a small angle ...

AI Technical Summary

Problems solved by technology

However, the ring laser angle measuring device senses the angular velocity relative to the inertial coordinate system. Therefore, the above included angle will introduce the earth's rotation angular velocity into the final output of the ring laser angle measuring device, resulting in angle measurement errors.

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