水平仪测试竖直轴系倾角回转误差的数据处理

为了更加准确地评定用水平仪测量竖直轴系的倾角回转误差,利用水平仪测试数据中误差的组成成分,明确两维水平仪读数中的谐波成分与回转误差中的谐波成分的相互关系。基于已有的2种数据处理方法,提出了将测量数据转换到固定坐标系下2种新的处理方法。详细分析了4种数据处理方法的优缺点,其中一次谐振分离方法将回转误差中的一次谐振量成功分离,得到了完整的回转误差。通过改变铅垂度,对轴系回转误差进行8次测量,对比所辨识的参数,从而验证了该方法的正确性。

A Novel Data Processing Method of Measuring Wobble Errors of Vertical Axis System with Levels

In order to accurately appraise the wobble errors of the vertical axis system measured by two orthogonal levels, the readouts of the levels were analyzed and the error compositions are expounded.And the coupling relationships among the harmonic components of the readouts, and of the wobble errors, the plumb error of the vertical axis line, are analyzed.According to the two existing methods, transforming the processed readouts into the expressions in the fixed coordinate system, thus the two processing methods are put forward.The orthogonal and the correlative first harmonic errors are separated from the total first harmonic, namely the correlative first harmonic which is the composition of wobble errors is retained.In the end, by modifying the plumb errors, and measuring wobble errors eight times correspondingly, and the correctness of the proposed method is verified by the comparison with the identified parameters.