Coordinate conversion method based on multi-dimensional dynamic etalon

Abstract

The invention discloses a coordinate conversion method based on a multi-dimensional dynamic etalon and belongs to the field of precise measurement. The method comprises steps that firstly, a large-size measurement field is constructed by utilizing a multi-dimensional dynamic etalon provided with an ERS point target ball and a laser tracker; secondly, the position of ERS points is adjusted by utilizing the etalon, laser trackers are utilized for measurement, and reading of the etalons is performed after each adjustment; and lastly, a coordinate system of the multi-dimensional dynamic etalon istaken as a global coordinate system, a translation matrix and a rotation matrix for registering coordinates of the laser trackers to the global coordinate system are calculated, and the coordinates ofthe laser trackers are registered to the global coordinate system. The method can effectively reduce a non-uniform system error of traditional fixed public ERS point transfer registration, greatly inhibits influence of the non-uniform system error in the measurement length direction of the laser trackers, has advantages of high precision and high reliability and has better practicability in the application of the precision measurement technology.

Description

technical field [0001] The invention belongs to the field of precision measurement and relates to a coordinate conversion method based on a multi-dimensional dynamic standard. Background technique [0002] High-precision and efficient digital measurement technology is widely used in the aerospace field. Among them, large-scale precision measurement technology provides important data support for high-precision assembly of major equipment in the aerospace field. This technology uses multiple laser trackers to monitor in real time the pose of large components equipped with ERS point (Enhance Reference System) target balls. In order to fuse the data of multiple laser trackers, multiple fixed public ERS points are often arranged in the measurement field as a basis for the conversion between the local coordinates and the global coordinates of different laser tracker measurement points. However, the measurement error of the laser tracker changes with the distance between the laser...

AI Technical Summary

Problems solved by technology

Most of the existing methods fix the target ball of the public ERS point, and use the fixed ERS point as the reference to perform transfer station registration. However, the measurement error of the laser tracker increases with the distance between the target ball and the ERS point. The station position has anisotropy and inhomogeneity to the measurement error of the fixed public ERS point target ball. In addition, factors such as the selection of the global coordinate system and the change of the external environment will also affect the measurement error of the fixed public ERS point.

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