As a key stage in the assembly process of large-scale products

pose measurement has characteristics of diverse methods and complex theory. It is helpful to analyze process of pose measurement theoretically by dividing pose measurement modes according to different measurement principles

and studying characteristics of various measurement modes is of great significance for accurate pose measurement. Firstly

pose of component was divided into absolute pose and relative pose according to the assembly process of large-scale products. Secondly

by analyzing principle of relative pose measurement

the research of pose measurement mode was carried out

three basic pose measurement modes were defined

and three combination modes were derived on this basis. Finally

the application of pose measurement mode was analyzed with three specific relative pose measurement cases

which provided a theoretical basis for selection and optimization of pose measurement method in large-scale products assembly tasks.