A Technology to Get Coordinate-System of Cube-Prism in Electron-Theodolite Surveying System

In the process of assembling spacecraft,we usually transform position datum of spacecraft's parts to its cube-prism,by measuring and adjusting cube-prism to make spacecraft's parts in suitable position.When measuring cube-prism we often need to build up coordinate-system of cube-prism.Two methods to build up a normal of cube-prism is introduced.Under this foundation how to build up 3D coordinate-system of cube-prism in electron-theodolite surveying system is discussed.