水平仪测试竖直轴系倾角回转误差的数据处理

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.