In-situ calibration device for large-size 3D space measurement and its measuring method

Abstract

An in-situ calibrater for lage-size 3D space measurement and its measuring method is disclosed. A standard object with known reference distance is used, and more than 2 theodolites are used to observe the known standard point on said standard object at same time. A constraint equation is created on the basis of said standard distance and theodolite parameters, and then solved by optimizing method to obtain the model parameters of the odolite. Its advantages include no error caused by human factor, and high measuring precision.

Description

technical field [0001] The invention belongs to a precision test instrument and a measurement method, in particular to a field calibration device and a measurement method for large-scale three-dimensional space measurement. Background technique [0002] Calibration is the basis of precision measurement and an important part of modern metrology testing. A measuring device or instrument must be calibrated by a higher-level precision instrument (or device) to have measurement accuracy and be used for actual measurement. [0003] In the field of length measurement, the medium size is a commonly used size, there are many types of measuring instruments, and the related calibration technology and devices are relatively complete. Perfect, especially the on-site calibration of large-scale spatial three-dimensional coordinate measuring instruments still lacks effective technical means. [0004] The technical key to realize on-site calibration of spatial coo...

AI Technical Summary

Problems solved by technology

The precise adjustment and mutual aiming scheme determines the rotation matrix between the theodolite coordinate system contains a considerable human error factor: first, when adjusting the theodolite level, it is difficult to manually adjust the accuracy to within 2″; secondly, when two theodolites are aiming at each other, because The aiming target is the center of the telescope, which is not conducive to the precise aiming of the theodolite, and there is a large aiming error. The rotation matrix R thus determined contains a large error, and this error will be further transmitted to the translation matrix T; another situation that must be considered is , in many application sites, there may be immovable obstacles in the space between theodolites, and mutual aiming between theodolites cannot be carried out

Therefore, the main disadvantage of this method is that due to manual intervention, considerable errors will definitely be introduced, thereby affecting the measurement accuracy

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