Method of improving laser tracker station moving precision based on photogrammetry
A technology of laser tracker and photogrammetry, which is applied in the field of measurement and can solve problems such as large errors
Active Publication Date: 2016-08-03
BEIHANG UNIV
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[0006] In view of the problem of large errors when the laser tracker measures large-sized objects, the purpose of the present invention is to provide a method for improving the accuracy of the laser tracker's transfer station based on photogrammetry, which can improve the measurement accuracy on the basis of the laser tracker
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[0054] specific implementation plan
[0055] The present invention will be further described in detail below in conjunction with accompanying drawings and examples.
[0056] In order to achieve the above object, the present invention provides a method for improving the accuracy of the laser tracker transfer station based on photogrammetry. The equipment used in the method includes: at least one laser tracker for the measurement of target objects and public points; at least A laser tracker control cabinet, connected with the laser tracker; at least one laser tracker target ball, used as the laser tracker to measure the target; a digital camera, used for photogrammetry, to take pictures; multiple photogrammetry target balls, Used as a photogrammetric target; multiple target ball mounts for holding two types of target balls; multiple marker points, glued near a common point; at least one reference ruler for photogrammetric calibration; at least one workstation, with a laser track...
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The invention discloses a method of improving laser tracker station moving precision based on photogrammetry. The method comprises the following steps: 1, a device is mounted and a common point is fixed; 2, a laser tracker is used for measuring a target and the common point at two stations A and B; 3, photogrammetry is used for measuring coordinates of the common point; 4, centroids of two point clouds are coincident and coincident with the original point of a coordinate system; 5, a photogrammetry point cloud rotates around a coordinate axis until a group of corresponding vectors are coincident; 6, the photogrammetry point cloud rotates around the coordinate axis to specify corresponding vectors to be coincident; 7, inverse centroid processing is carried out on the photogrammetry point cloud after rotation; 8, data after correction of multiple groups are solved, and the average value is calculated as a correction value; 9, coordinates of the common point in the station B are corrected; 10, a unit quaternion method is used for solving a conversion matrix; and 11, the length, the angle and the like of the measurement target are calculated. The effects of improving the laser tracker station moving precision are achieved, and the problem of large errors when the laser tracker measures a large-sized object can be solved.
Description
technical field [0001] The invention relates to a method for improving the transfer station accuracy of a laser tracker based on photogrammetry, and belongs to the technical field of measurement. Background technique [0002] Both surveying with laser trackers and photogrammetry are common methods of measurement in precision surveying. Photogrammetry has the characteristics of high precision, high efficiency, and high degree of automation. The measurement range includes discrete point measurement, deformation and motion measurement, three-dimensional contour measurement, etc. It has been widely used in automobile manufacturing, aerospace manufacturing, robot calibration, pipeline measurement, etc. industrial field. [0003] The laser tracker is a portable three-coordinate measurement system. Due to its high measurement accuracy and fast efficiency, it is currently widely used in various technical fields of industrial measurement such as aviation, aerospace, automobiles, and...
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Login to View More IPC IPC(8): G01B11/00
CPCG01B11/005
Inventor 孙占磊景喜双张承阳张宇翔罗敏赵罡
Owner BEIHANG UNIV