Patent ID: 7893874

Claim:
A method of creating a global coordinate of a polyhedral hollow frame, the method comprising the steps of: a first step of providing a plurality of transmitters on a reference surface in the hollow frame, providing a plurality of reference sensors to create the coordinate of the reference surface, and creating a local coordinate frame of the reference surface on the basis of the positional coordinates measured by the reference sensors; a second step of providing reference sensors at common points of a first vertical surface neighboring to the reference surface to measure and store the coordinates of the common points; a third step of providing a plurality of transmitters and reference sensors on the first vertical surface neighboring to the reference surface to create a local coordinate frame of the first vertical surface; a fourth step of transforming the local coordinate frames created at the first and the third steps into a global coordinate frame using the coordinates of the common points measured at the second step; a fifth step of repeatedly performing the second step to the fourth step on remaining vertical surfaces of the polyhedral hollow frame to transform the respective local coordinate frames into a unified global coordinate frame; a sixth step of providing transmitters on an upper surface neighboring to each vertical surface to obtain the relationship between the global coordinate frame and a local coordinate frame of the upper surface using the coordinates of the common point; and a seventh step of creating and applying a global coordinate frame using the relationship obtained at the sixth step.